Tools

This is a listing of tools for analysing, debugging and visualising HTTP/2. See also the Implementations listing.

• Curl supports HTTP/2¹ as of 7.43.0. See its documentation for details (including prerequisites).
• h2i is a command-line interactive client that lets you send H2 frames, translate H1 to H2, and generally figure out how the protocol works.
• h2load is a benchmarking / load generation tool for HTTP/2 and SPDY.
• nghttp is a non-interactive command line HTTP/2 client that has plenty of debugging options, such as changing flow control window, dumping frames, HTTP Upgrade etc.
• nghttpd is a simple static file HTTP/2 server that is very handy to debug client side implementations.
• is-http2 lets you quickly find out if a host supports H2 from the command line.
• HTTP/2 Test is an online tool to check if a website supports HTTP/2.
• Wireshark has a HTTP/2 decoder².
• h2c - A Simple HTTP/2 Command-Line Client
• h2spec - Conformance testing tool for HTTP/2 implementations
• http2fuzz is a semi-intelligent fuzzer for HTTP/2.
• WProf extracts dependencies of activities during a page load, to identify bottlenecks.

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¹ Curl is strictly an implementation, but it's listed here because many people use it as a tool.

² Note that to use it on TLS-protected connections, you'll need to do NSS Keylogging. See also the Wireshark SSL/TLS docs.