More general compression configuration for Apache

Works with Apache ≥ 2.1 and requires `mod_deflate` and `mod_filter` to
be enabled. However, use of Apache < 2.2 is no longer recommended.

For Apache ≥ 2.1 → 2.3.7, `mod_filter` isn't needed, but requiring it
and using this solution is the best way going forward (plus, it doesn't
introduce other dependencies to other modules like, for example,
`mod_version`).

Fix gh-1012
Ref gh-1173

.htaccess

@@ -163,36 +163,24 @@ AddType text/vtt                            vtt
     </IfModule>
   </IfModule>
 
-  # HTML, TXT, CSS, JavaScript, JSON, XML, HTC:
-  <IfModule filter_module>
-    FilterDeclare   COMPRESS
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/html
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/css
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/plain
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/xml
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/x-component
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/javascript
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/json
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/xml
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/xhtml+xml
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/rss+xml
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/atom+xml
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/vnd.ms-fontobject
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $image/svg+xml
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $image/x-icon
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/x-font-ttf
-    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $font/opentype
-    FilterChain     COMPRESS
-    FilterProtocol  COMPRESS  DEFLATE change=yes;byteranges=no
-  </IfModule>
-
-  <IfModule !mod_filter.c>
-    # Legacy versions of Apache
-    AddOutputFilterByType DEFLATE text/html text/plain text/css application/json
-    AddOutputFilterByType DEFLATE application/javascript
-    AddOutputFilterByType DEFLATE text/xml application/xml text/x-component
-    AddOutputFilterByType DEFLATE application/xhtml+xml application/rss+xml application/atom+xml
-    AddOutputFilterByType DEFLATE image/x-icon image/svg+xml application/vnd.ms-fontobject application/x-font-ttf font/opentype
+  # Compress all output labeled with one of the following MIME-types
+  <IfModule mod_filter.c>
+    AddOutputFilterByType DEFLATE application/atom+xml \
+                                  application/javascript \
+                                  application/json \
+                                  application/rss+xml \
+                                  application/vnd.ms-fontobject \
+                                  application/x-font-ttf \
+                                  application/xhtml+xml \
+                                  application/xml \
+                                  font/opentype \
+                                  image/svg+xml \
+                                  image/x-icon \
+                                  text/css \
+                                  text/html \
+                                  text/plain \
+                                  text/x-component \
+                                  text/xml
   </IfModule>
 
 </IfModule>

CHANGELOG.md

@@ -1,5 +1,6 @@
 == HEAD
 
+* Improve the Apache compression configuration (#1012, #1173).
 * Add a HiDPI example media query (#1127).
 * Add bundled docs (#1154).
 * Add MIT license (#1139).