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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (A Tale of HTTP/2)
+[#]: via: (https://veronneau.org/a-tale-of-http2.html)
+[#]: author: (Louis-Philippe Véronneau https://veronneau.org/)
+
+A Tale of HTTP/2
+======
+
+Around a month ago, someone mentioned the existence of [HTTP/2][1] in an IRC channel I lurk in. For some reason, I had never heard of it and some of the features of this new protocol (like mutiplexing requests without having to open multiple TCP connections) seemed cool.
+
+To be honest, I had just finished re-writing the Puppet code that manages our backup procedures and enabling HTTP/2 seemed like a productive way to procrastinate before moving on to an another large project. How hard could this be?
+
+Turns out it took me around 25 hours of work... Sit back and put on comfortable slippers, for this is a tale of HTTP/2!
+
+[![The Yule Log][2]][3]
+
+### Cursed Be the HTTP/1.1
+
+When I first looked up how to enable HTTP/2 on Apache it seemed a pretty simple task. The documentation mentioned loading the `http2` module and making sure to prioritise the new protocol via a configuration file like this one:
+
+```
+Protocols h2 h2c http/1.1
+
+H2Push on
+H2PushPriority core.md Dict.md lctt2014.md lctt2016.md lctt2018.md LICENSE published README.md scripts sources translated after
+H2PushPriority text/css before
+H2PushPriority image/jpeg after 32
+H2PushPriority image/png after 32
+H2PushPriority application/javascript interleaved
+```
+
+This would of course have been too easy. Even if everything in Apache was set up properly, websites kept being served as HTTP/1.1. I was obviously doing something right though, since my websites were now sending a new HTTP header: `Upgrade: h2, h2c`.
+
+After wasting a good deal of time debugging TLS ciphers (HTTP/2 is [incompatible with TLS 1.1][4]), I finally found out the problem was that we weren't using the right multi-processing module for Apache.
+
+Turns out Apache won't let you serve HTTP/2 while using `mpm_prefork` (the default MPM), as it is not supported by `mod_http2`. Even though there are two other MPM you can use with Apache, only `mpm_prefork` supports `mod_php`. Suddenly, adding support for HTTP/2 meant switching all our webapps built in PHP to PHP-FPM...
+
+### Down the Rabbit Hole
+
+![A clip from Alice in Wonderlands][5]
+
+For the longest time, a close friend has been trying to convince me of the virtues of [PHP-FPM][6]. As great as it looked on paper, I never really did anything about it. It seemed so ... complicated. Regular ol' `mod_php` did the trick just fine and other things required my attention.
+
+This whole HTTP/2 thing turned out to be the perfect excuse for me to dive into it after all. Once I understood how FPM pools worked, it was actually pretty easy to set up. Since I had to rewrite the Puppet profiles we're using to deploy websites, also I took that opportunity to harden a bunch of things left and right.
+
+PHP-FPM let's you run websites under different Unix users for added separation. On top of that, I decided it was time for PHP code on our servers to be ran in read-only mode and had to tweak a bunch of things for our Wordpress, Nextcloud, KanBoard and Drupal instances to stop complaining about it.
+
+After too much time passed automating tasks in Puppet, I finally was able to turn off `mod_php` and `mpm_prefork` everywhere and to enable `mpm_event` and `mod_http2`. The speed bonus offered by PHP-FPM and HTTP/2 is nice, but more than anything I'm happy this whole ordeal forced me to harden the way our Apache servers deal with PHP.
+
+![Victory!][7]
+
+--------------------------------------------------------------------------------
+
+via: https://veronneau.org/a-tale-of-http2.html
+
+作者：[Louis-Philippe Véronneau][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://veronneau.org/
+[b]: https://github.com/lujun9972
+[1]: https://en.wikipedia.org/wiki/HTTP/2
+[2]: https://veronneau.org/media/blog/2018-12-22/yule_log.jpg (The Yule Log)
+[3]: https://commons.wikimedia.org/wiki/File:The_Yule_Log.jpg
+[4]: https://http2.github.io/http2-spec/#TLSUsage
+[5]: https://veronneau.org/media/blog/2018-12-22/mod_php.gif (A clip from Alice in Wonderlands)
+[6]: https://wiki.apache.org/httpd/PHP-FPM
+[7]: https://veronneau.org/media/blog/2018-12-22/victory.png (Victory!)