Exploring the Differences Between HTTP/2 and HTTP/3

📆 · ⏳ 2 min read · · 👀


HTTP, or Hypertext Transfer Protocol, is the foundation of data communication on the World Wide Web. It is a protocol that allows clients and servers to communicate with each other and exchange information.

The latest versions of HTTP, HTTP/2 and HTTP/3, are designed to improve the performance, security, and reliability of web applications. Let’s dive deeper into what makes these two protocols different.

What is HTTP/2?

HTTP/2 is the successor to HTTP/1.1, and it was designed to address some of the limitations of the previous version. HTTP/2 enables the server to send multiple requests in a single connection, eliminating the need for multiple TCP connections.

It also supports server push, which allows the server to send resources to the client before they are requested. This can significantly improve web performance by reducing the latency of page loading.

What is HTTP/3?

HTTP/3, on the other hand, is the newest version of HTTP, and it uses a different transport protocol called QUIC ↗️. QUIC was designed to address the limitations of TCP, which can cause delays and packet loss.

HTTP/3 is designed to improve web performance in situations where network conditions are poor or inconsistent. It achieves this by reducing the number of round trips required to establish a connection and encrypting more of the communication between client and server.

Differences between HTTP/2 and HTTP/3

One of the main differences between HTTP/2 and HTTP/3 is the transport protocol used. HTTP/2 uses TCP, while HTTP/3 uses QUIC.

Another difference is that HTTP/3 is designed to improve performance on unreliable networks, such as mobile networks. HTTP/3 reduces the number of round trips required to establish a connection and encrypts more of the communication between client and server.

Additionally, HTTP/3 supports connection migration, allowing a client to switch to a new network without dropping the connection.


HTTP/2 and HTTP/3 are both designed to improve web performance and security, but they differ in their approach.

While HTTP/2 uses TCP to improve performance, HTTP/3 uses QUIC to address the limitations of TCP. With the increasing use of mobile devices and the internet, HTTP/3 is expected to become more prevalent in the coming years.

By understanding the differences between HTTP/2 and HTTP/3, developers can choose the right protocol for their web applications and ensure optimal performance for their users.

You may also like

  • # system design# database

    Choosing the Right Data Storage Solution: SQL vs. NoSQL Databases

    Navigating the world of data storage solutions can be like choosing the perfect tool for a job. Join me as we dive into the dynamic debate of SQL and NoSQL databases, understanding their strengths, limitations, and where they best fit in real-world scenarios.

  • # system design

    Raft and Paxos: Distributed Consensus Algorithms

    Dive into the world of distributed systems and unravel the mysteries of consensus algorithms with Raft and Paxos. In this blog, we'll embark on a human-to-human exploration, discussing the inner workings of these two popular consensus algorithms. If you have a solid grasp of technical concepts and a curious mind eager to understand how distributed systems achieve consensus, this guide is your ticket to clarity!

  • # system design

    Understanding Load Balancing Algorithms: Round-robin and Consistent Hashing

    Welcome to the world of load balancing algorithms, where we unravel the magic behind Round-robin and Consistent Hashing. If you have a solid grasp of technical concepts and are eager to understand how these algorithms efficiently distribute traffic across servers, this blog is your ultimate guide. We'll embark on a human-to-human conversation, exploring the inner workings of Round-robin and Consistent Hashing, and how they keep our systems scalable and performant.