HTTP/2 speed test

HTTP/2 speed test - compare performance of HTTP/1 vs. HTTP/2

Please note that you are accessing this page via http:// scheme and your browser might warn you about that. It is not possible to run this test via https:// scheme because loading the left iframe via http:// scheme would lead to a mixed content.

The following test loads the same iframe (with more than 200 images) via the same CDN service but via different schemes. The left iframe is loaded via the http:// scheme and thus HTTP/1 protocol is used because all current browsers support HTTP/2 only via https:// scheme. The right iframe is loaded via the https:// scheme and thus HTTP/2 protocol is used in HTTP/2 supported browsers.

Test HTTP/1

Test HTTP/2

Check HTTP/2 support test!

HTTP/2 frequently asked questions

What is HTTP/2?

HTTP/2 is a new version of HTTP protocol. It’s goal is to improve website performance by optimizing how HTTP is transferred "on-the-wire". It doesn’t change the semantics of HTTP, which means that HTTP headers, status codes, etc. work exactly the same way as in HTTP/1.

What are the key performance improvements?

  • HTTP/2 protocol is multiplexed which means that multiple requests can use the same TCP connection and thus website assets can be requested in parallel. HTTP/1, in contrast, requires each request to use its own TCP connection and thus website assets are requested sequentially.
  • HTTP/2 protocol allows browser to use stream priority mechanism. Stream priority mechanism is a mechanism for browsers to load HTML content for a web page first, followed by CSS, then JavaScript, and finally images. This allows browsers to render web pages quickly.
  • HTTP/2 protocol automatically compress HTTP headers. This reduces the amount of data that needs to be transferred between a browser and a server.
  • HTTP/2 protocol allows servers to push responses proactively into viewer's browser cache instead of waiting for viewer to request it.
  • HTTP/2 protocol is binary, instead of textual. Binary transfer is more effective "on-the-wire" than textual.
  • Other HTTP/2 improvements can be found here.

Does CDNsun support HTTP/2?

Yes, CDNsun supports HTTP/2 protocol. All our CDN Static / CDN Static Push services are compatible with HTTP/1.0, HTTP/1.1 and HTTP/2 (equivalently HTTP/2.0) protocols.

Which browsers support HTTP/2?

A list of browsers that support HTTP/2 protocol can be found on

What if viewer's browser doesn't support HTTP/2?

If viewer's browser doesn't support HTTP/2 protocol then our CDN edge server will automatically communicate with the browser over HTTP/1 protocol.

Does HTTP/2 require SSL?

HTTP/2 protocol does not require SSL encypted connection, but all current browsers support HTTP/2 protocol only for SSL encrypted connections. It means that to use HTTP/2 protocol you must use a CDN service with SSL enabled and integrate it over https:// scheme.

What Next?

Check out our HTTP/2 support test.

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