HTTP/2 Checker

What HTTP/2 changes

HTTP/2 is a major revision of the protocol that powers the web. It introduces multiplexing, which allows multiple requests and responses to share a single connection, header compression to reduce overhead, and server push as an optional mechanism. These features reduce latency and improve resource loading compared to HTTP/1.1, especially on pages with many assets.

Why HTTP/2 support matters

Modern browsers negotiate HTTP/2 automatically when the server supports it. Sites that still serve content over HTTP/1.1 may load more slowly because browsers are limited in how many concurrent connections they open per host. HTTP/2 often improves performance without requiring changes to page markup, though the benefits are greatest for resource-heavy pages.

Interpreting the result

An "enabled" result indicates that the server negotiated HTTP/2 for the tested URL. A "disabled" result means the response used an earlier protocol version. HTTP/2 typically requires HTTPS in browser contexts, although the protocol itself can run over plaintext. If the result is disabled, check whether the server software supports HTTP/2 and whether it is enabled in the virtual host or CDN configuration.

Limitations

This tool tests a single URL and reports the protocol used for that request. The protocol can vary by host, port, CDN configuration, and whether the connection is proxied. It does not measure the performance impact of HTTP/2 or test server push behavior. Use the result to confirm protocol support and combine it with broader performance testing.