Re: svn commit: r1673470 - /httpd/httpd/trunk/docs/manual/mod/mod_deflate.xml

[Rainer Jung]

Am 14.04.2015 um 19:06 schrieb rbo...@apache.org:
Author: rbowen
Date: Tue Apr 14 17:06:10 2015
New Revision: 1673470
URL: http://svn.apache.org/r1673470
Log:
Add "pre-compressed content" recipe, as per
https://bz.apache.org/bugzilla/show_bug.cgi?id=51336

Modified:
     httpd/httpd/trunk/docs/manual/mod/mod_deflate.xml

Modified: httpd/httpd/trunk/docs/manual/mod/mod_deflate.xml
URL: 
http://svn.apache.org/viewvc/httpd/httpd/trunk/docs/manual/mod/mod_deflate.xml?rev=1673470&r1=1673469&r2=1673470&view=diff
==============================================================================
--- httpd/httpd/trunk/docs/manual/mod/mod_deflate.xml (original)
+++ httpd/httpd/trunk/docs/manual/mod/mod_deflate.xml Tue Apr 14 17:06:10 2015
@@ -178,6 +178,51 @@ SetEnvIfNoCase Request_URI \.(?:gif|jpe?
      </example>
  </section>

+<section id="precompressed"><title>Serving pre-compressed
+content</title>
+
+    <p>Since <module>mod_deflate</module> re-compresses content each
+    time a request is made, some performance benefit can be derived by
+    pre-compressing the content and telling mod_deflate to serve them
+    without re-compressing them. This may be accomplished using a
+    configuration like the following:</p>
+
+    <highlight language="config">
+  &lt;IfModule mod_headers.c&gt;
+    # Serve gzip compressed CSS files if they exist
+    # and the client accepts gzip.
+    RewriteCond %{HTTP:Accept-encoding} gzip
+    RewriteCond %{REQUEST_FILENAME}\.gz -s
+    RewriteRule ^(.*)\.css $1\.css\.gz [QSA]
+
+    # Serve gzip compressed JS files if they exist
+    # and the client accepts gzip.
+    RewriteCond %{HTTP:Accept-encoding} gzip
+    RewriteCond %{REQUEST_FILENAME}\.gz -s
+    RewriteRule ^(.*)\.js $1\.js\.gz [QSA]
+
+
+    # Serve correct content types, and prevent mod_deflate double gzip.
+    RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1]
+    RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1]
+
+
+    &lt;FilesMatch "(\.js\.gz|\.css\.gz)$"&gt;
+      # Serve correct encoding type.
+      Header append Content-Encoding gzip
+
+      # Force proxies to cache gzipped &amp;
+      # non-gzipped css/js files separately.
+      Header append Vary Accept-Encoding
+    &lt;/FilesMatch&gt;
+  &lt;/IfModule&gt;
+</IfModule>
+
+
+    </highlight>
+
+</section>
+
  <directivesynopsis>
  <name>DeflateFilterNote</name>
  <description>Places the compression ratio in a note for logging</description>

AFAIK mod_rewrite automatically adds headers from RewriteCond to the 
Vary header as long as no "NV" flag is used. So the "Header append Vary 
Accept-Encoding" part should not be necessary.

Thanks for putting effort into documenting the recipe.

Regards,

Rainer

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