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Home / Viewpoint / What is HTTP 2 | How to Test HTTP/2 API?

What is HTTP 2 | How to Test HTTP/2 API?

In recent years, a successor to HTTP/1.1, known as HTTP/2, has emerged with promises of faster, more efficient web browsing. This article aims to clarify HTTP/2, explaining what it is, its key advantages over HTTP/1.1, and how to leverage its benefits. Let's dive into it.

The evolution of the Internet has brought about significant changes in the way we communicate, work, and access information. Central to this transformation is the Hypertext Transfer Protocol (HTTP), the foundation of data communication on the World Wide Web.

In recent years, a successor to HTTP/1.1, known as HTTP/2, has emerged with promises of faster, more efficient web browsing. This article aims to clarify HTTP/2, explaining what it is, its key advantages over HTTP/1.1, and how to leverage its benefits. Let's dive into it.


What is HTTP/2?

HTTP/2 is the second major version of the HTTP network protocol. It was developed by the Internet Engineering Task Force (IETF) and approved in May 2015. The primary goal of HTTP/2 is to enhance the performance of websites and web applications by reducing latency and optimizing the way data is transmitted between clients and servers. It achieves this through several key features:

  1. Multiplexing: HTTP/2 allows multiple requests and responses to be sent concurrently over a single connection. This eliminates the head-of-line blocking problem found in HTTP/1.1, where a slow-loading resource could delay the loading of other resources on a page.
  2. Binary framing: Instead of the plain text used in HTTP/1.1, HTTP/2 employs a binary format, which is more efficient for both the client and the server. This results in faster parsing and reduced overhead.
  3. Header compression: HTTP/2 uses HPACK compression to significantly reduce the size of header fields in each request and response, resulting in reduced bandwidth consumption and quicker page loading.
  4. Server push: HTTP/2 allows servers to push resources to the client before the client requests them, further reducing latency and optimizing performance.

Why is HTTP/2 Not Widely Used?

While HTTP/2 offers numerous advantages, it has not seen widespread adoption for several reasons:

  1. Server and browser support: To benefit from HTTP/2, both the server and the client must support the protocol. Although most modern browsers and web servers do support HTTP/2, older systems and configurations may not, limiting its universal implementation.
  2. Network latency: HTTP/2's advantages are more pronounced in high-latency network conditions. In low-latency environments, the differences between HTTP/1.1 and HTTP/2 may not be as significant, which can discourage adoption.
  3. Complexity: Implementing and configuring HTTP/2 can be more complex than using HTTP/1.1. Organizations may be hesitant to switch due to the effort required to transition.

HTTP/1.1 vs. HTTP/2

HTTP/1.1 has been the backbone of web communication for over two decades. While it has served its purpose well, HTTP/2 offers several improvements:

  1. Multiplexing: HTTP/1.1 uses a series of ordered, blocking connections. In contrast, HTTP/2's multiplexing feature allows multiple requests and responses to be sent concurrently on a single connection, reducing latency and speeding up page loading.
  2. Binary framing: HTTP/1.1 relies on plain text, which is less efficient in terms of data transfer and parsing. HTTP/2 uses a binary framing format that is more streamlined and faster.
  3. Header compression: HTTP/2 uses header field compression, which reduces the size of headers sent in each request and response, resulting in less bandwidth consumption.
  4. Server push: HTTP/2 introduces server push, enabling servers to proactively send resources to the client before they are requested, improving page load times.

HTTP/2 vs. HTTP/3

HTTP/2 and its successor, HTTP/3, share many goals in terms of performance enhancement, but they differ in their underlying technologies:

  1. Transport protocol: HTTP/2 relies on the Transmission Control Protocol (TCP), while HTTP/3 uses the User Datagram Protocol (UDP) in the form of QUIC (Quick UDP Internet Connections). This makes HTTP/3 potentially faster, especially in high-latency networks.
  2. Multiplexing: Both HTTP/2 and HTTP/3 support multiplexing, but HTTP/3's implementation is more efficient due to its use of QUIC.
  3. Server push: While HTTP/2 introduced server push, HTTP/3 enhances this feature further, making it more effective.
  4. Connection setup: HTTP/2 requires multiple round-trips to establish a connection, whereas HTTP/3 with QUIC minimizes connection setup latency.

How to Test HTTP/2 Request Easily?

It is worth mentioning that Apidog,  your trusted API lifecycle management tool, now proudly offers full support for the HTTP/2 protocol. This exciting development allows you to harness the power of HTTP/2 when working with APIs in a seamless and efficient manner.


With Apidog's HTTP/2 support, you can experience faster and more efficient API communication, reducing latency and improving overall performance. Whether you're designing, testing, or sharing APIs, Apidog's HTTP/2 integration ensures that you can take full advantage of the latest web protocol advancements.

If you're interested in taking advantage of HTTP/2 in Apidog,  here's how to get started:

Step ⒈ Open Apidog and create a new request.

Step ⒉ Configure your API. Take this endpoint URL as an example, URL:  https://api.sandbox.push.apple.com/. Switching to " Settings" and select HTTP and HTTPS protocols to specify the request.


Step 3  You can successfully get the response without any error by clicking the "Send" button.

Send API

How to Change from HTTP/1.1 to HTTP/2

Transitioning from HTTP/1.1 to HTTP/2 can be a bit complex, but the benefits can be significant. Here's a step-by-step guide to make the switch:

  1. Upgrade your web server: Ensure your web server software is up to date and has HTTP/2 support. Configuration changes may be necessary to enable HTTP/2 support.
  2. Implement SSL/TLS: To use HTTP/2, your website must be served over HTTPS. Acquire and install an SSL/TLS certificate on your server to enable secure connections.
  3. Update your content: Ensure your website's content and code are optimized for HTTP/2. Minimize the number of requests, leverage browser caching, and use responsive images to improve performance.
  4. Test extensively: Thoroughly test your website's functionality and performance after enabling HTTP/2. Pay attention to load times, page rendering, and overall user experience.
  5. Monitor and fine-tune: Continuously monitor your site's performance and make any necessary adjustments to maximize the benefits of HTTP/2.


HTTP/2 is a significant step forward in web communication, offering numerous improvements over its predecessor, HTTP/1.1. While it has not achieved universal adoption, its advantages in terms of speed and efficiency make it a compelling choice for web developers and administrators.

By following the steps to enable HTTP/2 and making the necessary adjustments, you can take full advantage of this modern web protocol and enhance the user experience on your website. As the internet continues to evolve, embracing technologies like HTTP/2 becomes essential for staying competitive in the digital landscape.

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