This page tests whether developer.mozilla.org supports HTTP/2 and modern web protocols, reporting the negotiated protocol and response time.
Below you can review the protocol details for developer.mozilla.org and run a new test for any other domain.
HTTP/2 is a major revision of the HTTP protocol that improves performance through multiplexing, header compression and server push, reducing latency compared to HTTP/1.1.
Modern sites increasingly adopt HTTP/2 and HTTP/3 (over QUIC) to deliver faster, more efficient page loads.
If developer.mozilla.org negotiates HTTP/2 (h2), it benefits from multiplexed connections and lower latency. Falling back to HTTP/1.1 may indicate older server configuration.
The response time reported for developer.mozilla.org gives a quick indication of how fast the server responds over the negotiated protocol.
This page reports whether developer.mozilla.org negotiates HTTP/2, showing the protocol returned by the server during the connection.
The result shows the protocol negotiated with developer.mozilla.org, such as HTTP/2 (h2) or HTTP/1.1, along with the response time.
If developer.mozilla.org returns HTTP/1.1, the server or its CDN may not have HTTP/2 enabled. Enabling it usually improves performance.
HTTP/2 generally improves performance for developer.mozilla.org through multiplexing and header compression, especially for pages with many resources.
Yes. The XploreNetHub HTTP/2 Test is completely free, requires no sign-up and runs directly in your browser.