[Solved] Force HTTP2
Added by JulianGro about 4 years ago
Hello, I would like to disable http1.0 and http1.1 in order to force the client to use http2.
Is this possible with lighttpd? The server.protocol-http11 option as shown in https://redmine.lighttpd.net/projects/lighttpd/wiki/Docs_ConfigurationOptions doesn't seem to work (doesn't take anything, not even enable).
I am on lighttpd/1.4.59 (ssl) on Debian Bullseye.
Reason for wanting to force http2 is that I want to 100% make sure that my client is using http2 to test support and performance.
Replies (4)
RE: Force HTTP2 - Added by gstrauss about 4 years ago
There is no way to "force" clients to upgrade to HTTP/2. (That is a general statement and not limited to lighttpd.)
Clients supporting HTTP/2 should attempt HTTP/2 with "h2" in ALPN during TLS negotiation, or can attempt Upgrade: h2c with HTTP/1.1.
.
For server.protocol-http11, the doc was a bit misleading and I have updated it. The doc should say server.protocol-http11 = "disable" or server.protocol-http11 = "enable"
For historical misbehaving clients, server.protocol-http11 = "disable" disables HTTP/1.1, forcing HTTP/1.0
server.feature-flags += ( "server.h2proto" => "disable" ) would disable HTTP/2
If you disable both HTTP/1.1 and HTTP/2, that leaves only HTTP/1.0
RE: Force HTTP2 - Added by JulianGro about 4 years ago
Ah. So one needs to write "enable" or "disable" instead of enable or disable.
I guess your answer takes care of my question.
RE: [Solved] Force HTTP2 (nope: controlled by client) - Added by gstrauss about 4 years ago
You could patch lighttpd in a couple lines of code to reject requests that are not HTTP/2, but that would not force the clients to use HTTP/2. Instead, it would only send an error to the request. There is prior art which suggests 426 Upgrade Required: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/426
Perhaps I'll add a feature flag for that to lighttpd.
RE: [Solved] Force HTTP2 (nope: controlled by client) - Added by gstrauss about 4 years ago
If you want to intercept requests and reject non-HTTP/2 requests with 426 Upgrade Required, then you can do so using mod_magnet and checking SERVER_PROTOCOL lua:
Check for lighty.req_env["SERVER_PROTOCOL"] != "HTTP/2.0"