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Guide to Mastering the Web Development Life Cycle

Today, all businesses can effectively reach their target market by using website design. However, behind a complete and professional website are hours of UX/UI design, monitors crammed with thousands of lines of code, testing, bug fixing, and feature enhancement. People are typically unaware of the various stages the web application goes through. And if you plan to hire a web development company to create one, you need to know how your project will be developed. In this blog, we have provided all the vital information you need to know about this process as well as outlined the seven steps of the web development life cycle, which's standard workflow at SupremeTech. Understanding The Web Development Life Cycle The process of building a website or web application, which includes designing, coding, testing, and deploying it to a production environment, is referred to as web development. In order for the website or application to continue to meet the needs of its users and function properly, it also involves ongoing maintenance and support. The web development life cycle, on the other hand, is a methodology or framework that outlines the precise steps involved in the development process, such as planning, design, development, testing, deployment, and maintenance. It offers a structured method for web development, assisting in the systematic and effective creation of the website or application. Investing in a well-structured web development life cycle can help organizations develop better websites that meet the needs of their users while also reducing costs and improving collaboration and transparency. Statistics from Fit Small Business show that not only large businesses but also small ones are focusing their resources on building websites, and this is an effective way for them to introduce their brand to potential customers. The Stages of the Web Development Life Cycle Web Development Life Cycle (WDLC) involves several stages that start from conceptualization and ends with the deployment and maintenance of the web application. The following are the stages involved in the WDLC: 1. Planning In this phase, the target market, the necessary resources, and the objectives of the website or web application are all determined. It's critical to picture the kinds of people you want to visit your website.  This involves understanding the demographics, psychographics, and behavior patterns of the target audience. This information is used to create a user persona that guides the design and development of the website. The planning phase also includes many other crucial decisions, such as choosing the technology stack and software development methodologies, creating a strong sitemap and wireframe, allocating resources, and many others. 2. Analysis When all the requirements of the website or web application are defined, a detailed analysis is conducted to understand the technical feasibility, risks involved, and potential challenges. It lays the foundation for the rest of the development process and ensures that the website meets the needs of the target audience. Proper planning and analysis during this stage can save time and money later in the development process and ensure the success of the website. 3. Design One of the most important stages of the web development life cycle is this one. Wireframing and website layout design are part of this phase. The layout of the website's main page serves to show how information is organized, creating a visual tour of the content. During this stage, you must also design the wireframe. The base layout of the website is created by converting the designed wireframe into tabs, menus, buttons, dashboards, graphics, color schemes, and web typography. It's also essential to use web design to satisfy audience demand as well as the brand image. The website's bounce rate will rise if the design is uninteresting and unable to hold visitors' attention. Fit Small Business also reports 38% of users will leave a bad website rather than try to navigate it, and nearly 39% of professional web designers agree that bad design repels visitors. 4. Development In this stage, the actual development of the website or web application takes place using various programming languages, frameworks, and tools. Your website's client-side and server-side development must then be completed. This is the most time-consuming phase in the web development process. In order to get the best performance out of your website, you must perform both front-end and back-end development. 5. Testing Every developer must test a website multiple times before it is finally launched to guarantee better performance and a better user experience. In this stage, the website or web application is tested for its functionality, usability, compatibility, and security.  If you skip this step, your website may experience numerous errors that will negatively affect its quality and performance. More than just web design, users expect excellent customer service as well. After three (or even fewer) poor customer service encounters, four out of five users are willing to abandon a brand they are loyal to. 6. Deployment The website or web application is deployed on the server and made accessible to the public during this phase. Depending on the size and complexity of the project, the deployment process may involve different steps, such as configuring the environment, compressing files, establishing caching, and establishing load balancing. 7. Maintenance The job isn't done yet. Continuous feedback from user interaction informs you of potential areas for improvement. Regular maintenance and updates are critical to keeping the site running smoothly and engaging new users. All phases of the web development life cycle are critical to the success of your website. As a result, you must complete all of these steps in order to create the best-performing website for attracting more users and growing your business. Common Challenges in Web Development Life Cycle Web development can be challenging due to various reasons, here are three common challenges in the WDLC: Poor Communication While good communication among employees may boost the efficiency and success of web development, poor communication may ruin its life cycle. Every stage of the cycle needs a seamless flow of information and ideas across teams. Small friction in communication not only costs much time and money but also prevents achieving the goals of web development projects. So, such barriers should be identified timely to boost productivity. Scope Creep Scope creep is a common problem and may occur through every phase of a web development life cycle. There are various reasons causing scope creep, namely deficiency of detailed scope, ineffective communication skills, and so on. For instance, at the development stage, a developer adds a feature which displays appealing images and website menu, but it takes more days and out of client requirements. Although that feature is great, it is outside of scope and may affect project progress. Therefore, each phase of web development must be managed properly to avoid scope creep. Lack of Testing In the life cycle of web development, the absence of testing can undoubtedly present a challenge. Without proper testing, there is a risk that the website or application may contain bugs or errors, which can lead to a poor user experience, lost revenue, and damage to the reputation of the business or organization. Testing can also help to identify areas for improvement, such as performance bottlenecks or usability issues. By identifying these issues early on, web developers can make changes to the website or application to improve its overall performance and user experience. Mastering The Web Development Life Cycle with SupremeTech The Web Development Life Cycle, in summary, is an essential framework for creating excellent, functional websites and web applications. Building effective and dynamic websites requires a thorough understanding of the web development process and the technology stack. This would be a difficult and time-consuming task. Therefore, whether you are a startup with an incredible idea or an established company looking to expand your online presence, hiring an outsourcing team of developers who follow all the guidelines outlined above to help you create an aesthetically appealing website could be a great idea. Contact SupremeTech for expert guidance from our development team in creating the ideal custom website for you.

How to Ensure Data Security When Outsourcing?

As ransomware attacks and data leaks increase, data security when outsourcing is a major concern. Therefore, businesses must adopt the highest security standards to protect themselves, their employees, partners, and clients. In this blog, we will share the most common data risks when outsourcing and solutions. Check it out! What are the data risks when outsourcing? Before choosing whether outsourcing is right for your company, it is critical to understand the common data risks. Here are the top 4 risks when outsourcing: Unauthorized access When technology is outsourced, monitoring and managing might be more challenging. The more privileged credentials are cultivated, the more unauthorized access and data breaches increase. There is a risk that unauthorized individuals will gain access to your private information if the outsourcing provider lacks adequate security measures. This may result in data breaches or identity fraud. Data theft and breaches According to the Cybersecurity Outlook 2022, indirect cyberattacks—successful breaches that enter businesses through third parties—have grown to 61% from 44% in recent years. One reason for this is that many businesses lack the necessary controls to successfully offboard their partners. Threat actors can abuse the data taken to perform various malicious activities, including fraud, account abuse, identity theft, and account takeover attacks. Due diligence and ongoing vulnerability monitoring throughout the vendor lifecycle will help to minimize that risk. A defense-in-depth approach to restrict unauthorized third-party access to an organization's network is essential to preventing adversaries from obtaining privilege escalation. Loss of Data Control When a company distributes responsibility for developing and operating its information system to another outsourcing company, it may lose control over the data. If the vendor is the only option for running and developing the company's information system, the company must accept any technology the vendor provides. This dependency can result in higher expenses or losing control over their data. Therefore, you should select the correct partner to handle data as a sensitive issue. Since procedures that aren't carried out in-house are inherently less controllable, a company should be able to conduct audits on its outsourcing partners as required. ⇒ You might be interest in: In house vs outsourcing application development: Which is best? Regulatory Compliance Violations This happens when third-party vendors break governmental laws, industry rules, or internal company procedures. As a result, your companies could be subject to severe monetary penalties. Your company, for example, must ensure that the third-party suppliers comply with the SOC2 auditing standard. SOC2 aims to make sure that third parties safeguard their customers' data from unauthorized access. Organizations must ensure that third parties follow privacy and security legislation, such as the European Union's General Data Protection Regulation (GDPR) and the California Privacy Rights Act (CPRA). How to Ensure Data Security When Outsourcing Here is a list of best practices recommended to ensure data security when outsourcing: Sign a Comprehensive Contract A Comprehensive contract allows parties to restrict their activities to the intended purposes. Such agreements, once signed, serve as proof of their intentions and show their ultimate understanding of the transaction. When a company outsources, it is critical for them to make written agreements with the outsource provider outlining how their data will be used, shared, or transferred for the purposes specified in the contract. This restricts third-party access to their data and subjects them to penalties in the event of a breach, enabling businesses to preserve confidential information even when it is not in their control. Implement Data Security Measures As technologies advance, the demand for more sophisticated data security solutions increases. Before giving your outsourcing partner access to sensitive data, ensure they use cutting-edge software tools and protection methods. This step plays an important role in ensuring sufficient data security when outsourcing. Check with the ITO provider you are partnering with that has the required tools to prevent viruses and spyware and an action plan in the event of a cyber attack. Regular penetration tests are required to discover security loopholes. Train Employees Training data security is a critical step that everyone must participate in, particularly those employees who are actively handling and processing customer data. An excellent company will: Provide ongoing training on data securityKeep up with compliance and regulatory procedures and ensure employees are aware of themEncourage employees to disclose security concerns and incidentsAudit employee handling of customer data on a frequent basis When workers are in a rush, keeping up with data security and compliance measures can fall by the wayside. As a result, conducting regular training and audits guarantees that workers are following compliance procedures. Regularly Monitor Data Security A company's in-house IT and data security staff should periodically monitor and review the most recent data security threats. Employees in-house can be trained to examine and check the progress of any outsourced work. They can also be prepared to be cautious of potential data breaches or suspicious behavior. Conclusion At SupremeTech, we frequently help clients optimize internal data security when outsourcing, as well as provide a variety of service areas, such as web and mobile development. Our outsourcing services are implementing a unique data-driven approach within our high-performance teams and highly engaged culture. To experience the advantages and achieve data security in outsourcing, Visit our website today!

4 Benefits of Custom Software Development with Solutions

With the benefits of Custom Software Development, it's hard to imagine a company can be successful without software applications nowadays. If you're considering using custom software development but aren't sure if this is best for you, understanding the advantages of custom software will help you make the right choice. First, let's go over the fundamentals. What exactly is Custom Software Development? Custom software development is a type of software application built to solve specific issues and fulfill the specific needs of an individual or a business. It includes the processes of developing, designing, deploying, and maintaining software based on the needs of the company. Benefits of custom software development Recognizing the benefits of custom app development for both customers and businesses will help you make the most suitable choices for you and your company. Increased Efficiency and Productivity Nobody can deny that software has a positive impact on employee productivity, particularly when the software application is tailored to a specific business and fulfills its requirements. It enables employees to work more productively and confidently on their duties. Apart from that, suitable software solutions may help your personnel in completing their tasks in much less time. It can help in the management of multiple resources, the productivity of your business processes, and the delivery of additional benefits to the bottom line. Improved Data Security Security and dependability are critical to the success of any company. This requires higher standards of security in enterprise software programs. According to a Protenus study, the healthcare sector alone experienced 32 million patient information breaches in the first half of 2019. It shows that data threats are becoming a major problem for any company that collects and stores data, especially those in the healthcare, payroll, insurance, fintech and accounting sectors. Custom software development solutions can ensure that all regulations are followed and that all confidential data is safeguarded. It can also assist you in determining which data-security tool to use and which one is best tailored to your business's requirements, as well as how to incorporate it into your application. The greater the level of security, the more trust your customers will place in you. Benefits of custom software development: Data security Scalability and Flexibility The business environment is ever-changing. As a result, companies must adapt to the changing market dynamics. As your business grows and evolves, custom software solutions give you the freedom to make changes, add new features, update your product, or seek support to meet shifting demands. Furthermore, scalability enables you to plan for future growth and expand your company while the software application remains viable. Competitive Advantage To achieve a competitive advantage with custom software, it is essential to collaborate closely with a software development company that has the expertise and experience to deliver a high-quality solution that meets the needs of a business. It's also important to realize that custom software isn't a one-time expense. It does, however, require maintenance and updates to guarantee a competitive advantage in the market. Custom software may give you a market advantage. Once you've identified how to improve your company by modernizing or customizing as needed, custom software can help you stand out from the crowd. As a result, it might reinforce your USP (unique selling proposition) and give you a significant competitive advantage over your rivals. How to Select the Best Software Development Partner for Your Company Here a few tips on how to find the best app development service for your company: Establishing Business Goals Before you start looking for the right partner, you should figure out what your needs are. It is critical that you understand the program you are about to create. Understanding your needs and goals should always come first when searching for a software development company. If you want to find the best service provider for your company, you must first comprehend what your needs are. Assessing Skills Examine case studies and other materials detailing projects completed by your potential partners. Bonus points for direct industry experience - if they have business leaders or development teams who have previously understood your company, services, and customers, they will be better equipped to help you solve the problems you face. Avoid choosing a company solely because they use cutting-edge technology or have a long list of services on their website. The length of time they have been in business is essential, but the amount of time they have worked with their own clients can show the level of expertise they provide. Reviewing Portfolios This is where you start comparing software development firms on your list. You can use the software development firm's portfolio as well as customer evaluations. You should consider whether the business has relevant experience. An outsourcing partner must have a thorough understanding of your market, industry, and business procedure. Be wary if a software development company claims to have done something comparable but refuses to share any details. Interviewing and Checking References You've used challenging questions to eliminate software development firms that aren't a good match. You can now connect with clients to confirm that your chosen partners have what it takes to create the software solution your company requires. Conclusion Now that you've completed all these steps, you're set to choose a high-quality new software development partner and can be confident in your decision. We hope you found the benefits of custom software development helpful guide and helped you discover the best software development partner. Once you've made that choice, we can help you in starting your first software project. Contact us if you want to learn more at SupremeTech! We're ready to answer the tough questions and assist you in completing your next software product.

Blockchain Wallets: A Beginner’s Guide to Developing Your Own Ones

An article that provides an overview of blockchain wallets and how to develop one. A blockchain wallet is a digital wallet that allows users to store, send, and receive cryptocurrencies such as Bitcoin, Ethereum, and Litecoin. Blockchain wallets are secure, decentralized, and transparent, and they provide users with full control over their funds. In this article, we'll provide an overview of blockchain wallets and explain how to develop them on your own. What is a blockchain wallet? Source: trustwallet.com A blockchain wallet is a software application that allows users to manage their cryptocurrency holdings. It interacts with the blockchain network to receive and send cryptocurrency transactions. Blockchain wallets are decentralized, which means they are not controlled by any central authority, and they are secured using private keys. Blockchain wallets come in different forms, including desktop, mobile, and web-based wallets. They can also be hardware wallets, which store users' private keys on a physical device, making them less vulnerable to hacking attacks. How to develop a blockchain wallet? Source: geeksforgeeks.org Developing a blockchain wallet requires a good understanding of blockchain technology, programming languages, and security best practices. Here are some general steps that you can follow to develop your own blockchain wallet: Choose a programming language The first step in developing a blockchain wallet is to choose a programming language. There are Some popular choices include JavaScript, Python, and Java. You'll also need to familiarize yourself with blockchain-specific languages such as Solidity, which is used to write smart contracts on the Ethereum blockchain. Choose a development framework There are several blockchain development frameworks available that can help you build your wallet more quickly. These popular ones include Ethereum's Truffle, Parity, and Embark. Choose a blockchain platform There are several blockchain platforms available, each with its own strengths and weaknesses. Bitcoin and Ethereum are two of the most popular blockchain platforms, but there are others as well. Develop your wallet's front-end Once you've chosen your programming language, development framework, and blockchain platform, you can start developing your wallet's front-end. This step includes designing the user interface and writing the code to implement it. Develop your wallet's back-end The back-end of your wallet will interact with the blockchain network and handle transactions. This includes writing the code to communicate with the blockchain network, as well as implementing security measures to protect users' private keys. Test and deploy your wallet Before launching your wallet, you should thoroughly test it to ensure that it works correctly and securely . Once your wallet is ready y, you can deploy it to a production environment. Tools and services for developing a blockchain wallet Source: dapp.com Developing a blockchain wallet from scratch can be a challenging process. Fortunately, there are several available tools and services that can help you get started more quickly. Here are some popular options: BlockCypher BlockCypher is a cloud-based blockchain platform that provides tools and APIs to building blockchain applications, including wallets. BitGo BitGo is a blockchain security company that provides a range of services, including multi-signature wallets, hot wallets, and cold storage. MyEtherWallet MyEtherWallet is a web-based wallet for the Ethereum blockchain that provides an easy-to-use interface to manage the Ethereum and ERC20 tokens. Conclusion Blockchain wallets are a critical component of the cryptocurrency ecosystem. They provide users with a secure and decentralized way to store, send, and receive cryptocurrency transactions. Developing a blockchain wallet requires a good understanding of blockchain technology, programming languages, and security best practices. With the right tools and knowledge, however, it's possible to create a powerful and secure wallet that meets the needs of users.

Why You Should Hire Outsource App Development Team?

There are numerous reasons why outsourcing is becoming increasingly popular amongst successful firms. As a result, it's safe to say that today's companies depend primarily on outsourcing to meet rising demand and make the most of their experience. By collaborating with a reliable outsource app development firm, you may improve business efficiency and produce top-notch mobile applications. When a firm or business hires a third party or agency from outside the company to handle work that usually could have been done in-house, this practice is known as outsourcing. An outsource app development team is a terrific approach to decrease costs when you have a lot of work to complete. While there are many benefits to outsourcing, whether or not your firm decides to do so depends on its current internal capabilities and its unique demands. Consider having outsource app development in order to save time and energy if mobile applications are vital to your company's success. Here some of the reasons: Access to Expertise If you're looking to get an app made, outsourcing is the way to go because you'll be working with experts. Start searching and you'll eventually find a group of outsource app development specialists who can build an amazing app for you. These programmers can help you finish your project on schedule without sacrificing quality by using their expertise, scalability, cutting-edge tools, and best app development practices. If you're on a tight budget, it can be difficult to get top talent in-house. You can pick and choose among the top developers in the business when you use an outsourcing firm to handle your app's development. So, whether it's an app for Android or iOS, you may have confidence in its superior quality. Ease of workflow In order to succeed and thrive, a company must concentrate on what it does best. Having in-house app developers can be a great idea, but it can also lead to a lot of distractions. If your company already has so much to take on, this may make things even more challenging for you. Outsourcing is a strategic technique that allows corporations to concentrate on their core business while passing off less important tasks to third parties. That's especially true in the information technology field. Not only so that staff members can focus on new initiatives and contribute to the company's expansion.  One more is the necessity of maintaining ongoing workflows thanks to time-zone differences with outsourced partners. Cost-effective App Development and Maintenance Process Should you invest in a costly, high-maintenance data-storage system when you can pay for secure, off-site cloud storage? Doing everything yourself can be costly and inefficient if outside help is available at a similar or lower cost. Outsource app development is one approach to decrease costs. You'll have access to a highly trained crew, and they'll provide all the necessary tools, so there won't be any overhead expenses associated with running an office. In addition to the obvious financial benefit of not having to pay for unfinished work, you'll also be able to save money on things like employee bonuses, benefits, and training. You'll pay just for the actual work that's completed, eliminating any unnecessary expenses and resulting in long-term cost savings. Risk Management Another advantage of outsourcing, although this one is sometimes ignored. Risk is an intrinsic element of doing business, but using a third party to design apps will provide some protection in the event that things do not go as planned. It's inevitable that your mobile app may experience some snags in the making, no matter how hard you try to avoid them. In addition to relieving you of day-to-day responsibility for a project, it can also help you better prepare for and react to any problems that may arise. Steps to hiring outsourcing app development team An outsourced workforce is different from in-house employees. If you want the process to go well, you should educate yourself about IT outsourcing. Understand your needs Both start-ups and more experienced companies make the same mistake when it comes to outsourcing app development: They fail to determine what it is they actually need. Think carefully about why you want to engage an outsourcing firm before you reach out to any potential candidates. Having a clear vision of how you want your mobile app or project to turn out. Creating a business plan is the first step when you have a concept you want to bring to life. Drafting a business strategy allows you to better examine your requirements, consider your choices, and define your expectations for your outsourced app development company. Find an app development team Finding a reliable outsourcing firm to operate with is crucial. You won't be able to reverse course midway through the project, so give this choice lots of thought before committing to anything. Think about whether your business would benefit more from a short-term arrangement or a more long-term partnership. The decision is ultimately yours to make, but bear in mind that a software company may serve you better if they have a thorough understanding of your business. Verify the portfolio and conduct research When you come across a business that seems like a perfect candidate for your interests, research them thoroughly online. Every trustworthy business will gladly show you its portfolio at any time. Find out if they have experience with projects like yours by looking at their previous work. Have a look at how many and how complicated the completed projects are. You should be able to get a hold of a demo of the app as well as some basic information about the apps that the outsourcing company has developed. See if it holds water by doing experiments. Conclusion If you need to meet a tight deadline but don't want to hire new staff, outsourcing is the way to go. Outsourcing allows you to take advantage of a highly trained workforce that would be hard to come by in your home nation. You can turn a profit from this business if you have what it takes to efficiently operate the service. Your option to outsource or not depends on your services and the project you need to complete. SupremeTech specializes in Outsource App Development. We have two fully operational IT service facilities in Asia: Vietnam and Japan. Please contact us so that we may discuss how we may assist with your upcoming endeavor.

In House Vs Outsourcing Application Development: Which Is Best?

You will surely be faced with the question of how to bring your concept to life at the start of each new project. Where can I locate seasoned experts, and how can I set up a team for development? Since making this decision might be difficult, let's list the key benefits of each solution. In this post, we'll provide further information to assist you in deciding between in house vs outsourcing application development. What is in-house application development? In-house development is the procedure in which you create your own team from the ground up. You'll fill roles depending on the skill sets and expertise required to create the product. Amazon and Paypal hire in-house developers, giving them complete control over the project at a greater cost. Choosing in-house application development is equal to recruiting permanent employees for your firm. To develop your own IT staff, you'll need to go through the process of hiring, interviews, and onboarding. If your startup is only focused on an IT product, hiring in-house would be reasonable. When to utilize in-house development? There is no financial restriction on you. Hiring an internal team will provide you with all the advantages and little disadvantages if you are not operating a bootstrapped business and have enough money at your disposal.You need to take total control. The risks of issues arising are high, and there is little you can do to reduce them. Every choice that has an impact on how the product is developed should be your and your team’s decision. It enables you to fully customize your company's internal engineering process to meet all of its minor technological requirements. In addition, to quickly adapt the project to your business, you may easily make the necessary adjustments during the development phase. Cons of in-house application It's expensive. Prepare to pay for both the apparent and hidden costs of assembling an in-house staff. That doesn't include the hidden costs of sick leave, vacation, insurance, social security, recruiting, and onboarding each new employee. Even if the crew is idle between projects, you must nevertheless fund their fixed salary.The rate of turnover might be rather high. Getting the top personnel for your firm is the easiest challenge to solve. IT professionals are in great demand, and you'll have a difficult time resisting poaching attempts from competitors and recruiters. You may end yourself counter-offering your developer with higher perks, causing the payroll to soar. Otherwise, your team's skills will be lost.It is your duty to train the team. With the advent of new technology each day, the IT sector is always changing. And to fully succeed, you'll need in-house development support from outside. Therefore, investment in training and tools may have a major impact on your company's bottom line. What is outsourcing application development? Outsourced application development, as opposed to in-house development, entails delegating the process of producing a product to an external agency. It is often accomplished through a contractual agreement in which the requirements are communicated to the outsourcing agency. IT services account for 72% of all worldwide outsourcing contract values in the outsource industry (ISG). Between in-house vs outsourcing application development, outsourced development is preferred over in-house development due to its low cost and scalability. IT outsourcing contributed $66.5 billion in worldwide revenue in 2019 as a developing trend. Google and Slack are two well-known organizations that have outsourced their IT development. IT services account for 72% of all worldwide outsourcing contract values in the outsource industry Source: PowerSoursing Outsourcing development is the superior option in the following instances: There is a financial limitation. You're on a limited budget and, like many startups, couldn't afford a full-time workforce. Outsourcing allows you to be more flexible with your financial flow. Furthermore, the responsibility of monthly wage does not burden you.There is a shortage of available talent. You can't seem to find the proper talent in your city or nearby areas. Rather than spending months educating someone, you're better off hiring an IT provider to handle the work.Launch deadlines are tight. If you have no past expertise in software development, you may be blown away by frequent problems. When you have a deadline to meet, you cannot afford to have delays that may be avoided by working with a skilled IT provider.There is a lack of clarity. Even with an in-house staff, developing a complicated IT solution will be a big task. There is a difference between business requirements and technical specifications. An outsourced vendor will frequently have a business manager who may function as a bridge between you and the developers. Cons of outsourcing application There is no complete control. Unlike an in-house team, an outsourced staff does not work only for you on your project. This indicates you have little influence over development, advancement, and problem-solving. Without a direct connection to the team, you may be unaware of what is going on with your project.There is a communication barrier. Because of the time zone difference, scheduling a meeting with an IT business halfway around the world will be difficult. Language differences might also be an issue if the outsourced team's leader has difficulties comprehending your issues.Concerns about trust. You are handing private information to a third-party developer when you outsource. You may be concerned about the agency's privacy policies and if it will take projects from rivals in the future. Differences between in house vs outsourcing application development Both processes have their own advantages and disadvantages, so knowing their key differences in terms of communication, timeline, experience, cost, and more aspects are essential before making your choice. Differences between in house vs outsourcing application development Source: Sigma Software In-houseOutsourcingCostsHigherLower, but also based on the outsourcing team you hireQualityHigh, and can meet your requirements preciselyHighExpertiseNarrowExtensive expertise in all fieldsSpeedQuicker, but it takes time to build a teamSlower, but more effective in urgent instances than building a new teamManagementStreamlined communication and well-set proceduresLess controllable, although this is dependent on the outsourced team you select.SecurityHigherLower, however this may be addressed with the use of NDAs and similar agreements.Recruitment and HiringComplexCan be tackled by your outsourcing partner In house vs outsourcing application development: Which is best? Source: Decode In Conclusion To summarize the question of in house vs outsourcing application development possibilities, it must be said that both models offer pros and downsides. The choice is determined by the project's qualities. The primary criterion to remember when deciding between in-house and outsourced web application development is that if online or desktop application creation or maintenance is not your company's core competency, it may be difficult for your IT personnel to get it correctly. They may lack the necessary experience or insight. After several failed efforts at doing it in-house, you may end up with an outsourced product. In that circumstance, developing an in-house solution is not a viable option. On the contrary, it is preferable to outsource it. Between in house vs outsourcing application development, a niche-specific app development business will make your product more competitive and generate more clients. Fortunately, there are numerous business application development services available today, so selecting the one that best meets your development needs will be simple. At SupremeTech with many years working in developing projects throughout various industries, we believes that technology has the potential to add infinite benefit to the globe and new product ideas and commercial possibilities will arise at a quicker rate. So let's get started today and let us help you create the next world-class product together.

Top features to consider when building a video call app

Video calling has been around for over a decade, and numerous people have adopted it for different reasons. For some, it's a more animated way to interact with family and friends who they can't easily meet physically. For others, it's a more effective communication tool for clarity and flexibility during work. The variety of use cases can leave teams conflicted about who to target and how to cater to them. Accordingly, let’s discuss some of the top features to consider when you decide to build a video call app: Variable permissions A good video call app strikes a decent balance between control and ease of access when setting up video calls. Whoever is creating a meeting should be able to restrict participation using features like meeting passcodes. However, they should also afford themselves and other participants some flexibility in how they invite others to join. Source: Unsplash Public links are already standard since they make this part easier. For example, you may invite some participants via email and send the link to someone via another chat app at the last minute if you realize their contributions will be relevant to the discussion. There are other permission options like real-time additions where you allow someone to join an ongoing call by selecting them from a contact list.  Live transcription Having video and audio makes comprehension easier, but not for everyone. Someone on the call may have a unique accent, and another may speak a different language. You could also have someone on the call with hearing problems or some other condition that makes it harder for them to understand what another participant is saying. But with live captions, you can reduce instances of people repeating themselves and simplify real-time note-taking. Additionally, people won't have to send many follow-up messages to revisit what was discussed and get clarity. Furthermore, you save time where transcriptions are needed, like when writing an article. Whoever is writing only has to revisit short segments and points in the recordings to confirm facts like statistics, roadmap commitments, and such. So for people who publish interviews or work for content marketing blogs, live captions can give them a head start on their work. Screen sharing and text chat The reality is that being able to see and hear the person you’re talking to on a call isn’t the acme of communication. Depending on the topic/purpose of the call, one participant may need to pass on some other information, and the seemingly rudimental options like text chat may come in handy. For instance, text chat can help you quickly spell out a word written quite differently from how it sounds. It also facilitates sharing links to other pertinent resources. However, video calls get more interesting when you bring in screen sharing. This feature enables presentations as a participant shows others what's on their screen. It simplifies conducting lessons using slides, and walkthroughs for product aspects like user interfaces. Screen sharing can also work for more casual purposes, like when you want to watch a movie or other video clips with friends. Resolution options 720p is the base standard for video resolution for many video call apps. This is no surprise since many people are content if they can recognize the person in the video. Nevertheless, some situations may require higher resolutions. Source: Unsplash For example, having the clearest picture helps showcase elaborate animations and other motion graphics with complex effects. You may also need this to conduct product demonstrations or display detail-heavy elements like embroideries in textiles, physical circuit boards, and other intricately designed products. That said, it’s nice if your video call app users can select a higher resolution like 1080p or more. Such high-quality video feeds are also cherished by large businesses that want to uphold their brand reputation when conducting live video events like Q&As, announcements, behind-the-scenes, conferences, and more. Filters and effects Video-based communication undoubtedly brings more possibilities for enhancing the information you're conveying. One of the most basic ways to do this is through virtual backgrounds. These can help make your surroundings more visually appealing and offer a canvas for branding elements like logos. Video call apps can even go further by offering other effects, filters, and Augmented Reality (AR) capabilities. These features make video calls fun by letting people express themselves differently, bringing out their lighter and goofy sides through masks, crowns, and more. Moreover, such functionality isn't only for bringing out the fun. It can also help people with conditions like photo-sensitive epilepsy, light sensitivity, and glare. Security and privacy Many people use video call apps for conversations they'd rather not have public. Whether it's private family matters or trade secrets, your app should offer users several ways to protect their information. This also extends to user metadata and other call-related information that some third parties, like advertisers and other businesses would like. Many video call apps already offer end-to-end encryption, but this isn’t enough, especially since hackers aren’t the only problem. Therefore, you should consider options like selective authorization of recording, screenshot alerts, viewing recordings only within the app, and access to others' video feeds only when your video is on. Source: Unsplash These can help users control who gets to record what is said and keep track of these actions. Ultimately, there are fewer scenarios where confidential information makes it out of the group without people knowing who was responsible. Wrapping Up To create a video call app, you need robust technical infrastructure and a highly skilled team. Imagine a call with nearly 100 participants, many with virtual backgrounds, lots of motion, colors, dynamic lights, AR filters, multiple text messages, and screen sharing, all in high resolution. This would require considerable computational resources to keep the experience very good. There are also plenty of problem sources when delivering such a service, so you should constantly learn and adapt accordingly. For professional assistance in gathering all the necessary resources for your video call app project, contact us for a free consultation.

What makes mobile apps slow (and how to speed them up)

It’s no secret that people are always on their phones. If they are not on a social networking app, they’re shopping, gaming, you name it. On average, mobile phone users check their devices 63 times every day. In addition, Americans use their cell phones for 5.4 hours every day on average. This is excellent news for anyone developing an app or considering doing so. However, your app development endeavors will be met with lots of competition. If you want to increase the chances of your app standing out and gaining popularity, you have to ensure that it is fast. Human beings are not inherently patient. With the advancement in technology, they expect maximum speed from all the apps on their phone. According to Apteligent, a mobile app performance specialist, 48% of users will remove or abandon an app if they have to wait longer than two seconds for it to launch. Keep reading this article if your app is slow and you need answers. We will discuss the different issues that make mobile apps slow and how you can speed them up for user satisfaction. 1.    Running outdated software versions App performance will gradually deteriorate if your application uses outdated frameworks and software or has not been upgraded to newer versions in a while. This is because older software versions cannot use more unique features, including improved compiler optimizations and higher community engagement and support. When newer iPhones are released, you'll notice more users complaining about their phones significantly slowing down. Solution Take a closer look at your technology stack and identify any software that still needs to be upgraded to the most recent version. As a rule, the latest versions feature greater compatibility and improved functionality. They provide far better performance and offer more stability. In addition, they are typically embedded with various enhancements that can immediately increase the speed and efficiency of your app, from improved tuning tweaks to security alerts and bug fixes. 2.    Connectivity issues As a developer, you can do little about connectivity issues. It is up to the app user to switch to a better cellular network provider or find a more robust and stable Wi-Fi connection. However, you can make some internal changes to your app to allow it to run more efficiently even when connected to a poor network. There are two possible solutions: Solution: Using a Content Delivery Network Whether you are using a web application or a mobile app, a content delivery network (CDN) can significantly enhance your app's performance. A CDN utilizes multiple servers located all over the world to distribute content quickly and efficiently to visitors. This strategy is highly effective because users receive content from the server that is physically nearest to them. Load data as requested A mobile app often handles enormous amounts of data daily. As a result, loading a large amount of data simultaneously will slow down the app because it is trying to process many requests simultaneously. It would be best to load the data as needed to remedy this. On the other hand, you can opt to divide it into smaller chunks. You'll need separate assemblies to achieve this. Alternatively, you can load textual data first and image-based content later. 3.    Too much data It goes without saying that if your app is overloaded with data, it will take longer to load. However, this does not mean you can delete the chunks of data and make your program lighter. For one, you might have to sacrifice valuable features that make your app unique. Solution: Data compression Compressing data helps speed up loading without sacrificing the attractiveness or functionality of audio components, vivid images, and video content. Compression is a powerful tool that can dramatically accelerate your app's speed.  Data compression takes two forms:  Lossless compression: As the name suggests, content like text and spreadsheets are compressed without losing data. This method allows you to restore a file to its original size without losing data. Lossy compression: Although chunks of data are lost in this method, app users are unaware of it. It is excellent for compressing images, audio, and video. Note: For better performance, you can cache some photos and compress them so you don't have to load them repeatedly whenever a user requests them. 4.    Server issues One of the most frequent causes of delayed apps is typically a server issue. When a user acts as the app, the server performs multiple functions. For example, it executes application code, communicates with thousands of other users, retrieves data from its memory, and rotates between a variety of tasks. Because of the multitude of actions, your server is overwhelmed. As a result, it could run out of memory or process requests slowly to prevent it from shutting down. As a result, it delays processing a few requests while others wait to be processed. As complex as this sounds, several viable solutions can fix slow servers. Solution: Integrating a reserve proxy server Taking some of the strain off your server could help it function quickly and accommodate more requests. In addition, you can outsource some server functions by incorporating a reverse proxy server. A reverse proxy server sits before the device and manages internal flow/traffic. It can do this easily because it is directly connected to the internet, giving it the power to interact with the server via a significantly quicker internal system. As a result, the application server can perform other actions, load pages and send them to the reverse proxy server. The reverse server, in turn, waits for the user's instructions and passes on the ready pages. A reverse proxy server enables your app to operate at benchmark speeds while maintaining optimum performance. Use a load balancer In some apps, multiple minor servers are used instead of a single large one. In this case, it is advised to incorporate a load balancer. A load balancer is a software tool that evenly distributes the load across the servers to maintain a low response time. In addition, a load balancer supports SSL termination and static file caching. If you are still determining which load balancer would be best for your app, specialists recommend sticking with the option available on your cloud platform. Wrapping up Maximizing your app's performance is in your best interest. For one, there are established quality standards you must meet. In addition, speed directly impacts user experience and whether they will stick with or dump your app. If you still need to figure out what's slowing down your app, you can contact a mobile app development business and ask for a performance audit to double-check whether everything is in order. We at Supreme Tech are available for a free consultation. We are an outsourcing IT company focusing on mobile and web apps for English-speaking clients. We build and maintain the products using the agile methodology based on the client's demands.

Crawl Website Đơn Giản Với Postman

Mở đầu Trong kiểm thử API, chúng ta không xa lạ gì với Postman, một tool kiểm thử API rất phổ biến và được sử dụng trong nhiều trường hợp khác nhau. Nếu như bạn chưa rõ API là gì, có thể tham khảo lại bài viết giới thiệu về API cơ bản của mình tại ĐÂY. Trong bài viết này, mình sẽ hướng dẫn các bạn cách crawl đơn giản một website bằng Postman nhằm kiểm tra xem các link hay hình ảnh có trong website đó có bị die hay lỗi gì không?  Crawl Website là việc lấy thông tin từ website , trích xuất ra những thông tin người sử dụng cần, đồng thời cũng tìm những link có trong trang web đó và tự động truy cập vào những link đó. Quá trình đó sẽ lặp đi lặp lại đến khi thu thập đủ thông tin người dùng cần.  Ví dụ dự án của bạn có một website như Landing Page hoặc trang chủ chẳng hạn, và trong trang lại có các hình ảnh, các hyperlink dẫn tới các trang con hoặc các website khác. Sau một thời gian bạn cần kiểm tra lại xem những hyperlink đó có còn hoạt động hay không. Thay vì phải click thủ công từng link một thì Postman có thể giúp bạn đơn giản hoá và tiết kiệm thời gian hơn cho việc này rất nhiều. Trước khi đi sâu vào bài viết, bạn cần có một số kiến thức về các khái niệm dưới đây: Script trong PostmanRunner trong PostmanCó một ít kiến thức cơ bản về Javascript Khâu chuẩn bị Để bắt đầu, máy tính của bạn cần cài đặt Postman, tất nhiên rồi. Sau đó chúng ta sẽ tạo một Collection chứa hai Request với tên bất kỳ và hai biến collection. Trong ví dụ dưới đây, mình sẽ tạo Collection tên Crawl Website cùng 2 request: Input check: Request này dùng để kiểm tra đầu vào trước khi crawl.URL check: Request chính dùng để crawl website.2 biến collection gồm có: rootUrl: URL gốc của trang cần checkstartUrl: URL bắt đầu khi chạy test, ở đây mình sẽ để rootUrl và startUrl chung 1 URL Input check Giờ chúng ta cùng thiết lập cho request đầu tiên. Ở request này, mình sẽ code tại phần Pre-request nhằm kiểm tra các đầu vào trong quá trình crawl website. Dưới đây là danh sách các function mình cần tạo trong request này Kiểm tra danh sách biến có trong collectionKiểm tra giá trị URL gán vào biến có định dạng hợp lệTạo biến Global để sử dụng cho request tiếp theo Như mình đã nói ở phần mở đầu, các bạn cần có kiến thức cơ bản về javascript để có thể hiểu hơn và tuỳ biến lại code phù hợp với nhu cầu của dự án. Mình sẽ có gắng giải thích đơn giản để những bạn ít biết về code vẫn có thể sử dụng được. Ở request này, URL của request chúng ta sẽ để biến {{startUrl}} với phương thức là GET. Kiểm tra danh sách biến có trong collection Trước khi kiểm tra được danh sách các biến có trong collection, ta sẽ chuyển các biến đó thành object và gán vào biến postmanVariables <strong>const</strong> postmanVariables = pm.collectionVariables.toObject(); Sau đó ta kiểm tra các biến cần sử dụng đã có trong collection hay chưa pm.expect(postmanVariables).to.have.all.keys("startUrl", "rootUrl"); Kiểm tra giá trị URL gán vào biến có định dạng hợp lệ Để kiểm tra giá trị URL gán vào biến có định dạng hợp lệ, ta sẽ sử dụng Regex. Đầu tiên ta sẽ gán định dạng URL viết dưới dạng regex vào biến urlRegex và so sánh các giá trị URL trong 2 biến collection là startURL và rootURL có giống với urlRegex hay không. const urlRegex = /^https?:\/\//; pm.expect(postmanVariables.startUrl, 'startUrl does not match URL pattern').to.match(urlRegex); pm.expect(postmanVariables.rootUrl, 'rootUrl does not match URL pattern').to.match(urlRegex); Tạo biến Global để sử dụng cho request tiếp theo Kết thúc script mình sẽ tạo biến 3 biến là link, url, index cho request tiếp theo. Ở đây mình sử dụng biến Global để cho dễ truy cập và lấy giá trị giữa các request, tuỳ thuộc vào tính chất dự án, bạn có thể sửa lại thành biến cho 1 environment cũng không có vấn đề gì nhé.  links: Mảng các link ta lấy được khi crawl một trang pm.globals.set("links", "[]"); url: URL đang test pm.globals.set("url", postmanVariables.startUrl); index: Số thứ tự của URL cần test trong mảng links ta crawl được pm.globals.set("index", -1); URL check Sau khi thiết lập xong request Pre-check, ta chuyển sang request URL check, đây sẽ là request chạy chính của mình.  Ở request này, URL của request chúng ta sẽ để biến {{url}} với phương thức là GET. Dưới đây là danh sách các function sẽ sử dụng trong request này: Kiểm tra link lỗiLấy các hyperlink có trong websiteLọc các link không liên và lặp crawlKết thúc vòng lặp Trước khi bắt đầu thì ta sẽ gán giá trị URL của 2 biến collection và 3 biến Global thành các biến Local cho dễ sử dụng const startUrl = pm.collectionVariables.get("startUrl"); const rootUrl = pm.collectionVariables.get("rootUrl"); const links = JSON.parse(pm.globals.get("links")); const currentUrl = pm.globals.get("url"); const currentIndex = parseInt(pm.globals.get("index")); Kiểm tra link lỗi Giờ ta sẽ tạo 1 hàm để kiểm tra xem link mình lấy về có bị lỗi hay không. Hiện tại thì link chúng ta test ban đầu chính là URL bạn gán vào biến startUrl. pm.test(`Link to "${currentUrl}" works`, function () { try { pm.response.to.not.be.error; } catch (error) { console.log(`FAILED :: ${currentUrl}`); console.log(`FAILED :: status code is ${pm.response.code}`); throw error; } }); Trong đó hàm try để kiểm tra xem link đó có trả về response lỗi hay không và hàm catch dùng để log lại thông tin lỗi. Tuỳ vào nhu cầu bạn có thể log thêm những thông tin khác bạn muốn kiểm tra nhé. Lấy các hyperlink có trong webiste Sau khi ta đã kiểm tra link ban đầu không bị lỗi, ta sẽ chạy hàm lấy các hyperlink có trong URL đó như sau: if (currentUrl.includes(startUrl)) { const $ = cheerio.load(pm.response.text()); $("a").each(function () { const newLink = $(this).attr("href"); if (!links.includes(newLink)) { links.push(newLink); } }); $("img").each(function () { const newLink = $(this).attr("src"); if (!links.includes(newLink)) { links.push(newLink); } }); } Để lấy dữ liệu từ trang web, ta sẽ crawl HTML của web đó và tìm kiếm thông tin ta cần từ các tag có trong HTML lấy về. Trong bài viết này mình sẽ thư viện Cheerio để lấy HTML của website cần test và gán nó vào biến $. Sau khi có được HTML rồi, ta sẽ tạo vòng lặp each để tìm các tag <a> và tag <img>, sau đó  lấy các URL trong attribute “href" ở trong <a> và “src" ở trong <img>. Tiếp đến ta sẽ gán nó vào biến newLink. Ngoài ra tuỳ thuộc vào nhu cầu và tính chất của trang web, các bạn có thể bổ sung thêm các thẻ và attribute có chứa URL cần test như <link> chẳng hạn. Vì ta chỉ cần check mỗi link 1 lần nên mình sẽ viết thêm 1 hàm if để kiểm tra xem URL lấy được đã được lấy trước đó hay chưa, nếu chưa thì sẽ bỏ link đó vào mảng links. Ở bước này bạn cũng có thể bổ sung thêm các điều kiện khác để check link lấy được tuỳ thuộc vào nhu cầu của bạn như không lấy link ads hay action link,... Lọc các link không liên quan và lặp crawl Chúng ta đã đi được hơn nữa quãng đường rồi. Sau khi lấy được các link có trong web và bỏ vào mảng links, giờ ta sẽ viết 1 function để trích xuất các link đó và chạy tiếp cũng như lọc những link không liên quan. const [nextUrl, nextIndex] = getNextUrlAndIndex(links, currentIndex); function getNextUrlAndIndex (links = [], index = 0) { const nextIndex = index + 1; if (links.length - 1 === nextIndex) { return []; } const linkUrl = links[nextIndex]; if (!linkUrl) { // Skip null links console.log('Encountered a null link.'); // Try to get the next link return getNextUrlAndIndex(links, nextIndex); } if (/^https?:\/\//.test(linkUrl)) { // Return if not a relative link return [linkUrl, nextIndex]; } // If the link is relative, prepend with rootUrl const cleanedRoot = rootUrl.replace(/\/$/, ''); const cleanedPath = linkUrl.replace(/^[\.\/]+/, ''); return [[cleanedRoot, cleanedPath].join('/'), nextIndex]; } Function này ta sẽ sử dụng biến links chứa mảng link đã lấy và biến index nhằm trích xuất vị trí link ta muốn chạy tiếp. Hàm if đầu tiên sẽ check nếu như ta chạy xong hết mảng link thì sẽ trả về mảng rỗng. Hàm if thứ 2 sẽ kiểm tra loại trừ các loại link mà bạn không muốn test, ở đây mình sẽ loại trừ null link, ngoài ra bạn có thể bổ sung thêm các loại link khác như link download chẳng hạn. Hàm if tiếp theo sẽ dùng regex để kiểm tra xem link đó có nằm trong các trang con của mình hay không. Mình sẽ check bằng logic nếu như đầu URL đó giống với biến rootUrl thì sẽ truy cập tiếp vào trang đó và lấy tiếp các URL có trong trang con và lặp lại đến khi nào không còn tìm thấy nữa thì thôi. Kết thúc vòng lặp Cuối cùng chúng ta sẽ chạy 1 hàm if để kết thúc vòng lặp crawl này if (nextUrl) { // Update global variables pm.globals.set("links", JSON.stringify(links)); pm.globals.set("url", nextUrl); pm.globals.set("index", nextIndex); postman.setNextRequest("Check URL"); } else { console.log("No more links to check!"); // Clear global variables pm.globals.clear("links"); pm.globals.clear("url"); pm.globals.clear("index"); // End the loop postman.setNextRequest(null); } Trong hàm if này nếu như vẫn còn get được link từ website thì sẽ tiếp tục gán vào biến Local để chạy tiếp bằng hàm postman.setNextRequest("Check URL");. Nếu như hết link thì mình sẽ đặt lệnh clear biến global để cho gọn phần biến tránh ảnh hưởng cho những lần chạy sau và set Next Request về null để kết thúc vòng lặp. Kết Vậy là chúng ta đã hoàn thành một collection crawl website đơn giản bằng Postman. Hi vọng các bạn có thể áp dụng được vào trong dự án của mình và hẹn gặp các bạn ở những bài viết tiếp theo. Reference Crawl Website Regex Postman Collection

Back/Forward Cache, Hiện Đại Hay Hại Điện?

Mục Lục Back/forward cache là gì?Nhận biết một trang được lưu, khôi phục từ back/forward cache.Tối ưu hóa cho back/forward cache bằng Chrome DevToolsNhững tác động của back/forward cache đối với trang web Đã bao giờ bạn gặp trường hợp giống thế này chưa? Bạn đang làm một website bán hàng. Khi người dùng đang ở trang thanh toán và đã điền đầy đủ thông tin tài khoản ngân hàng, tiếp theo họ chuyển đến trang giỏ hàng để cập nhật, sau đấy họ lại điều hướng trở lại trang thanh toán. Trên một số thiết bị, trang thanh toán sẽ được tải lại với form chứa thông tin tài khoản thanh toán được làm mới, nhưng trên một số thiết bị khác thì không, khi người dùng nhấp vào nút quay lại của trình duyệt, trang web trước đó sẽ không mất thời gian để tải lại mà nó sẽ xuất hiện ngay lập tức với những thông tin nhạy cảm mà người dùng đã nhập. Trên các thiết bị này, trang web đã được khôi phục từ một loại bộ nhớ đệm của trình duyệt có tên gọi là Back/forward cache. Trong vài trường hợp, việc lưu trữ nội dung của một trang web, để giúp người dùng có thể điều hướng trở lại ngay lập tức, mà không mất thời gian để tải lại như lúc ban đầu là một tính năng rất hay, hữu ích. Nhưng trong một số trường hợp khác, đấy cũng có thể trở thành bug. Back/forward cache là gì? Back/forward cache ( gọi tắt là bfcache) là một loại bộ nhớ đệm, giúp tối ưu hóa trình duyệt cho phép điều hướng quay lại và chuyển tiếp ngay lập tức. Nó cải thiện đáng kể trải nghiệm duyệt web cho người dùng — đặc biệt là những người có mạng hoặc thiết bị chậm hơn vì nó giúp trình duyệt có thể tải lại trang web trước đó mà không cần phải tải lại tài nguyên. Phát hiện một trang được khôi phục từ bfcache. Sự kiện pageshow được kích hoạt ngay sau sự kiện load khi trang web đang tải lần đầu và bất kỳ lúc nào trang được khôi phục từ bfcache. Sự kiện pageshow có một thuộc tính là persisted, nó sẽ có giá trị là true nếu trang được khôi phục từ bfcache (và ngược lại là false nếu không). Vì vậy, bạn có thể sử dụng thuộc tính persisted này để phân biệt trang được tải thông thường với trang được khôi phục từ bfcache. Ví dụ: window.addEventListener('pageshow', (event) => { if (event.persisted) { console.log('Trang web nay duoc khoi phuc tu bfcache.'); } else { console.log('Trang web nay duoc tai xuong binh thuong.'); } }); Nhận biết một trang có thể được đưa vào bfcache Ngược lại với sự kiện pageshow ta cũng có sự kiện pagehide. Sự kiện pagehide này sẽ được kích hoạt khi trang được tải xuống bình thường hoặc khi trình duyệt cố gắng đưa nó vào bộ nhớ đệm bfcache. Sự kiện pagehide này cũng có một thuộc tính là persisted. Nếu giá trị của nó là false thì bạn có thể chắc chắn rằng một trang sẽ không được đưa vào bfcache. Tuy nhiên, nếu giá trị của thuộc tính này là true, nó không đảm bảo rằng một trang chắc chắn sẽ được lưu vào bộ nhớ đệm đâu nhé. Nó chỉ mang ý nghĩa là trình duyệt dự định lưu trang đấy vào bộ nhớ bfcache mà thôi, nhưng có thể có các yếu tố khiến nó không thể làm như vậy. window.addEventListener('pagehide', (event) => { if (event.persisted) { console.log('Trang web nay *co the* duoc dua vao bfcache.'); } else { console.log('Trang web nay khong duoc dua vao bfcache.'); } }); Tối ưu hóa cho bfcache bằng Chrome DevTools Bộ nhớ đệm bfcache đã có trên tất cả các trình duyệt web phổ biến hiện nay nhưng hiện chỉ có Chrome là có cung cấp cho chúng ta công cụ để kiểm tra mà thôi. Công cụ dành cho nhà phát triển của Chrome có thể giúp bạn kiểm tra các trang của mình để đảm bảo chúng được tối ưu hóa cho bfcache và xác định bất kỳ vấn đề nào có thể khiến chúng không đủ điều kiện. Để kiểm tra một trang cụ thể, hãy điều hướng đến trang đó trong Chrome và sau đó trong DevTools, đi tới Application > Back/forward cache. Tiếp theo, nhấp vào nút Run Test và DevTools sẽ cố gắng điều hướng và quay lại để xác định xem trang có thể được khôi phục từ bfcache hay không. Nếu không thành công, bảng điều khiển sẽ cho biết trang không được khôi phục và liệt kê lý do tại sao. Nếu lý do là điều mà bạn với tư cách là nhà phát triển có thể giải quyết, thì lý do đó cũng sẽ được chỉ ra. Cập nhật hoặc xóa dữ liệu sau khi trang web được khôi phục bfcache Trở lại với vấn đề mà mình đặt ra ở đầu bài viết này. Nếu trang web của bạn lưu giữ trạng thái người dùng — đặc biệt là bất kỳ thông tin nhạy cảm nào của họ — thì dữ liệu đó cần được cập nhật hoặc xóa sau khi một trang được khôi phục từ bfcache. Một ví dụ khác, thường gặp hơn là nếu người dùng đăng xuất khỏi trang web trên máy tính công cộng và người dùng tiếp theo nhấp vào nút quay lại. Điều này có thể làm lộ dữ liệu riêng tư mà người dùng cho rằng đã bị xóa sau khi họ đăng xuất. Để tránh những trường hợp như thế này, có một vài trick có thể ngăn trang được đưa vào bfcache nhưng vẫn sẽ có những ngoại lệ, vậy nên tốt hơn hết là bạn nên luôn cập nhật lại trang sau một sự kiện pageshow nếu như event.persisted có giá trị là true. Đoạn mã sau sẽ kiểm tra sự hiện diện của cookie dành riêng cho trang web trong sự kiện pageshow và tải lại nếu không tìm thấy cookie: window.addEventListener('pageshow', (event) => { if (event.persisted && !document.cookie.match(/my-cookie/)) { // Bat buoc tai lai trang neu nhu nuoi dung da dang xuat. location.reload(); } }); Thống kê lượt truy cập trang web có sử dụng bfcache Như đã giới thiệu ở phần trên, nếu một trang web được khôi phục từ bfcache thì nó sẽ không tốn tài nguyên, dữ liệu mạng, điều đó cũng đồng nghĩa với việc trang web đó đã bị mất đi một lượt truy cập nếu bạn theo dõi lượt truy cập vào trang web của mình bằng các công cụ phân tích vì hầu hết các thư viện công cụ phân tích phổ biến không theo dõi khôi phục bfcache dưới dạng số lần xem trang mới. Vậy nên, nếu bạn không biết/lường được vấn đề này thì việc giảm lưu lượng truy cập, lượt xem do bfcache gây ra sẽ ít nhiều có ảnh hưởng không tốt đến việc xếp hạng trang web của bạn, mặc dù nó giúp tăng trải nghiệm của người dùng. Nếu bạn không muốn số lần xem trang của mình giảm xuống do trình duyệt bật bfcache, bạn có thể báo cáo số lần khôi phục bfcache dưới dạng số lần xem trang (được khuyến nghị) bằng cách lắng nghe sự kiện pageshow và kiểm tra thuộc tính persisted. Ví dụ sau đây cho thấy cách thực hiện việc này với Google Analytics ( logic cũng tương tự đối với các công cụ phân tích khác ) : // Gui mot luot xem khi trang duoc tai lan dau tien. gtag('event', 'page_view'); window.addEventListener('pageshow', (event) => { // Gui mot luot xem khi trang duoc khoi phuc tu bfcache. if (event.persisted) { gtag('event', 'page_view'); } }); Tổng kết Cái gì cũng có giá trị của nó, cũng có tồn tại những ưu và nhược điểm, bfcache cũng không ngoại lệ. Việc quay lại một trang trước đó mà không phải tải lại từ đầu là một tính năng rất hữu ích, không chỉ giúp tăng tốc độ điều hướng mà còn giảm việc sử dụng dữ liệu, vì trình duyệt không cần phải tải lại tài nguyên. Điều này giúp tăng trải nghiệm của người dùng đáng kể nhưng nó cũng tiềm ẩn rủi ro về bảo mật dữ liệu cá nhân, làm giảm lượt truy cập trang trực tuyến và một số vấn đề khác nữa. Điều quan trọng là bản thân người lập trình viên phải biết và kiểm soát được nó trong từng trường hợp, vì nếu không, trong một số trường hợp, tính năng cũng có thể sẽ trở thành bug. Bài viết này không chỉ dành cho các lập trình viên tham khảo mà ngay cả các tester cũng có thể đưa vào trong test case của mình đặc biệt là trong các trang web có yêu cầu yếu tố bảo mật hoặc những trang có dữ liệu thường xuyên thay đổi. Hi vọng bài viết này của mình hữu ích đối với các bạn. Đừng quên share và gắn bookmark cho bài viết này để tiện xem lại sau này nhé 😉 ! Tài liệu tham khảo Exploring a back/forward cache for ChromeBrowser Back/Forward Button History Navigation Cache (bfcache)Performance Game Changer: Browser Back/Forward Cache