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Diffstat (limited to 'docs/manual')
| -rw-r--r-- | docs/manual/howto/http2.xml | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/docs/manual/howto/http2.xml b/docs/manual/howto/http2.xml index 27c806286b..9e1eeb2de3 100644 --- a/docs/manual/howto/http2.xml +++ b/docs/manual/howto/http2.xml @@ -154,6 +154,25 @@ ProtocolsHonorOrder Off how to manage multiple hosts with the same certificate</a>.</p> </section> + <section id="mpm-config"> + <title>MPM Configuration</title> + + <p>HTTP/2 is supported in all multi-processing modules that come with httpd. However, if + you use the <code>prefork</code> mpm, there will be severe restrictions.</p> + <p>In <code>prefork</code> <code>mod_http2</code> will only process one request at at time + per connection. But clients, such as browsers, will send many requests at the same time. + If one of these takes long to process (or is a long polling one), the other requests will + stall.</p> + <p><code>mod_http2</code> will not work around this limit by default. The reason is that + <code>prefork</code> is today only chosen, if you run processing engines that re not + prepared for multi-threading, e.g. will crash with more than one request.</p> + <p>If your setup can handle it, configuring <code>event</code> mpm is nowadays + the best one (if supported on your platform).</p> + <p>If you are really stuck with <code>prefork</code> and want multiple requests, + you can tweak the <directive module="mod_http2">H2MinWorkers</directive> to make + that possible. If it breaks, however, you own both parts.</p> + </section> + <section id="clients"> <title>Clients</title> <p>Almost all modern browsers support HTTP/2, but only over SSL connections: Firefox (v43), |