HTTP/2 Checker - Test HTTP/2 Support for Server

Websites supporting HTTP/2 protocol & server push are faster to load. And faster sites have better search rankings. Test your site now!!

HTTP/2 Checker

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What is HTTP/2 Protocol?

HTTP/2 is a new protocol developed by Google to overcome issues faced in the HTTP/1.1 protocol. The primary goal of HTTP/2 is to reduce the latency and make applications faster, simpler, and robust. HTTP/2 protocol is able to address the latency issue which was earlier faced by HTTP/1.1 by

  • Full request and response multiplexing,
  • It allows compression of HTTP header fields and minimizes protocol overhead, 
  • Request prioritization, 
  • Server push support for resources.

The difference between HTTP/1.1 and HTTP/2 is how the data is formatted and sent across the client and server. Apart from this, all the core concepts are the same as HTTP/1.1. Before understanding how HTTP/2 works, let's understand how HTTP/1.1 works. 

How HTTP/1.1 works?

HTTP/1.1 is a simple request and response system, which means you send a request, and you get a response. So following are the steps involved when a user opens a website:

  1. The browser opens a single TCP connection with the server.
  2. It sends a request.
  3. It receives the response

Now when the browser parses the response from the server, it finds out there are more resources that are needed. What does the browser do? It opens a new TCP connection for the next resource. Imagine how long it would take for a browser to render a webpage if there are a large number of CSS or JS files.

To overcome this issue, browsers implemented a workaround that they open 6 simultaneous TCP connections. Even now if there are more than 6 resources that need to be loaded, the browser will have to wait.

The main problem with the HTTP/1.1 is the underutilization of TCP connection. A single TCP connection is capable of much more. Now we will see how HTTP/2 works. 

How HTTP/2 Works?

HTTP/2 protocol addresses the issue of a single request in a single TCP connection. HTTP/2 utilizes TCP connection very efficiently.

In HTTP/2, a client can send as many requests as it wants at the same time in a single TCP connection which is also known as multiplexing.  So when a browser finds out that it needs more resources to render the webpage, it sends requests for all the resources, and the server sends all the responses.

Now the question is how does the browser identify which response belongs to which request? The answer to which is the server tags the response with stream ID. 

HTPP/2 working

In HTTP/2, the data, as well as headers, are compressed. HTTP/2 comes with another cool feature know as server push.

HTTP/2 Push (Server Push)

This powerful feature of HTTP/2 allows a server to send multiple responses for a single request. This means when a client sends a request to the server and the server finds out that there are additional resources that might be needed (like CSS or JS files), it will push them to the client, without the client making any request for them.

Server push

HTTP/2 Protocol Pros and Cons


  • Request & response multiplexing over a single TCP connection
  • Compression
  • Server Push
  • Secure by default
  • Protocol negotiation during TLS (ALPN)


  • Server push can be abused when configured incorrectly. For example, the server will push resources whether a client needs them or not.
  • Can be slower when if used in mixed mode. For example, if server1 supports HTTP/2 but it proxy passes the request to another server that does not support HTTP/2. The end result becomes the same in this case.

HTTP/2 Checker

HTTP/2 Checker is an online application/tool which helps you test if your website's server supports HTTP/2 protocol or not. Perform HTTP/2 test now and if your website does not already support HTTP/2 protocol, you should upgrade to HTTP/2 because you are missing out on a lot of benefits.

HTTP/2 makes your website load faster, and faster websites have better page speed, and hence you can improve your search result rankings if done right. Also do not forget to add server push support for your CSS and JS files. If you want to dive deeper into HTTP/2 workings you can read here.

This is another video resource, which will help you understand better about working of HTTP/2 protocol.

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