Using .htaccess Files with Apache Page 2
Download the authoritative guide: Data Center Guide: Optimizing Your Data Center Strategy
Download the authoritative guide: Cloud Computing: Using the Cloud for Competitive AdvantageThe name '
.htaccess' isn't universally acceptable, though. Sometimes it can quite difficult to persuade a system to let you create or edit a file with such a name. For this reason, you can change the name that Apache will use when looking for these per-directory config files by using the
AccessFileNamedirective in your server's
httpd.conffile. For instance,
will cause Apache to look for files named
.htaccess. They'll be treated the same way, though, and they're still called '
.htaccessfiles' for convenience.
When Apache determines that a requested resource actually represents a file on the disk, it starts a process called the 'directory walk.' This involves checking through its internal list of
<Directory>containers to find those that apply, and possibly searching the directories on the filesystem for
Each time the directory walk finds a new set of directives that apply to the request, they are merged with the settings already accumulated. The result is a collection of settings that apply to the final document, culled from all of its ancestor directories and the server's config files.
When searching for
.htaccessfiles, Apache starts at the top of the filesystem. (On Windows, that usually means '
C:\'; otherwise, the root directory '
/'.) It then walks down the directories to the one containing the final document, processing and merging any
.htaccessfiles it finds that the config files say should be processed. (See the section on overrides for more information on how the server determines whether an
.htaccessfile should be processed or not.)
This can be an intensive process. Consider a request for
<URI:http://your.host.com/foo/bar/gritch/x.html>which resolves to the fileC:\Program Files\Apache Group\Apache\htdocs\foo\bar\gritch\x.html
Unless instructed otherwise, Apache is going to look for each of the following
.htaccessfiles, and process any it finds:
- C:\Program Files\.htaccess
- C:\Program Files\Apache Group\.htaccess
- C:\Program Files\Apache Group\Apache\.htaccess
- C:\Program Files\Apache Group\Apache\htdocs\.htaccess
- C:\Program Files\Apache Group\Apache\htdocs\foo\.htaccess
- C:\Program Files\Apache Group\Apache\htdocs\foo\bar\.htaccess
- C:\Program Files\Apache Group\Apache\htdocs\foo\bar\gritch\.htaccess
That's a lot of work just to return a single file! And the server will repeat this process each and every time the file is requested. See the overrides section for a way to reduce this overhead with the
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