With the advent of web applications, many web frameworks have also emerged in recent years. Although it is possible to develop web applications without these, it is a costly process. Web framework as a whole is a collection of components designed to facilitate the development of web apps. All are built with programming principles as a basis and must follow the MVC architecture design pattern. The idea is to allow web developers to focus on the important things instead of reinventing the wheel. So, some components can be reused.
It is a software component that can respond to an HTTP request. For a really basic static page, it can be done with just a one-page server. The web application server, namely the web application service, is relatively easy to understand. It is responsible for running the core business logic, handling user requests, and returning HTML to the user's browser. In order to complete their work, they usually need to access a variety of backend services, such as databases, caches, job queues, and so on. The web application server must have a specific programming language (Java, Node.js, Ruby, PHP, Java, C # .NET, etc.).
Technologies for the development of web applications
HTML is a plug-in language used to create websites. It allows the description of how the structure of a text-based document should be displayed on the browser. It encloses the text between HTML tags which defines the text and describes its design on the page. The tags describe which part of the text is a title, which is a paragraph and which parts are links, etc. The HTML tags command the structure of the page to the browser, and the browser uses it to display the text accordingly. Tags are invisible to users when the page is displayed in a browser. Such technologies as canvas were added to HTML5 to draw graphs and animations, disconnected data storage, and drag and drop functions.
Some Trends in Web Application Architecture
As described in a service-oriented architecture, a service is a particular software function that is independent of other functions. For example, a bank's software log necessarily includes a customer balance retrieval service, displaying a current balance at the bank's request or the customer. Retrieve customer balance is a service. Following the bank's lead, other services include deposit processing, withdrawal processing, and so on. In a service-oriented architecture, each of these services performs its work independently of the overall software system, using the same software system. This sounds counterintuitive, but in fact, it is not. Basically, different services use the same system to do the same thing and achieve different results. One of the keys to the success of service-oriented architectures is that the services themselves are looser. That is, they are adapted to different conditions. If service orders that receive customer credits suddenly become customer credits for all accounts, the software does not have to reinvent the virtual wheel. Instead, the service in question can achieve the same goals in different ways using the same basic protocol.
Any application that works on the internet is served on the user's computer using a browser or a particular application. In both cases, it requests the page or information from the server, which is then sent to the user's computer. In terms of web applications, everything is centralized. This offers several advantages; however, this leaves a lot to be desired in terms of security. Blockchain applications work in a completely different way. Everything is decentralized, including the code and data stored in the app.
_Other trends: Progressive Web Apps and Prioritizing Search Engine Optimization.
What is Backend & Front-End Development?
These are a set of commands that run on the server, i.e., "not in a browser" or "on a computer connected to a network (usually the Internet) that replies to messages from other computers". The backend consists of: a server, an application, and a database. It is the work behind the scene—everything the users don’t see or interact with. Backend languages are: Ruby, PHP, Python, Java, and .NET. It also means using database management systems such as MySQL, PostgreSQL, MongoDB, Cassandra, Redis, and Memcached.
Type of Architecture: Choose (MVC), (SPA), or (SSR) for the application.
Platform: Angular, React, and Web Components technology suite, etc.
Basically, modern applications must use several databases to store data. With the help of the database, we can easily carry out various processing operations on the data, e.g. updating data, deleting and computing data. In general, just like job servers, web application servers access the database directly. In addition, each backend service might require a separate database. The main potential for a NoSQL database is to perform operations on massive amounts of data that is not structured or connected in complex relationships. A document-oriented database is a data store that is based on documents that contain unstructured content. Documents are often separated into unstructured collections (can be viewed as SQL-tables), where unstructured here means that content in the same collection can have a different structure. Most popular database: MySQL, MongoDB, Redis, PostgreSQL.
An API defines an interface that exposes service data to other applications. Choosing the right API format is extremely important. Business does not always consider all factors when selecting a format. As a result, there is not enough opportunity to add new features that may be needed in the future. To save time, effort, and, most importantly, money, it is worth looking at the best practices that are currently being applied. This will help to develop an API that allows you to make the necessary changes in the future. Over the years, several API formats have appeared; consider the most popular of them. The most popular request-response APIs are REST, RPC, and GraphQL.
Web apps can perform better by having state and business logic in the client because it endorses the storage of database objects in the browser's memory, reducing the amount of server calls needed. Once it must consult the server, it happens asynchronously in the background without the user noticing any delay because there is no blocking process. This has excellent scalability benefits also because the server doesn't have to maintain session data in memory for every current user. Also, the thick-client architecture decouples the client from the server, which might facilitate replicating the backend, which is likely to improve the system's scalability.
Some Educational Challenges and how to overcome them with EdTech solution from Serokell:
The majority of Serokell programmers are the tutors in the leading universities, familiar with many of the edtech issues and education process concerns, like:
Problem: Passive students
The challenge: Staying connected with students
Serokell Solution: Integration to the edtech platform virtual classrooms for interactive lectures with online Q&A sections, adding quizzes and discussion interfaces, and voting.
Problem: Lack of group collaboration, isolation of individuals while studying online
The challenge: Organize the group work remotely
Solution: Adding the facilities for online meetups, group discussion with online tools for mass communication, like sharing several screens, automate video recording, online chats, and admin panel for group work moderation.
Problem: Paperwork and formal evaluation
The challenge: Organize the monitoring of activity, evaluate the results, and identify struggling students
Solution: Providing the tools for online monitoring and auto reporting; introduction of self-checking interactive test and final assessment sessions; integration of real-time widgets and dashboards for representation of individual achievements or knowledge gaps, demonstration of aggregated results, and/or detailed statistics.
Problem: Corporate and personal data privacy
The challenge: Protect the personal data
Solution: With the introduction of distributed ledger technologies and formal verification, we can provide the information only to verified users while protecting the custom system from data leakage