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<?xml version="1.0"?>
<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
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<modulesynopsis metafile="mod_speling.xml.meta">
<name>mod_speling</name>
<description>Attempts to correct mistaken URLs by ignoring
capitalization, or attempting to correct various minor
misspellings.</description>
<status>Extension</status>
<sourcefile>mod_speling.c</sourcefile>
<identifier>speling_module</identifier>
<summary>
<p>Requests to documents sometimes cannot be served by the core
apache server because the request was misspelled or
miscapitalized. This module addresses this problem by trying to
find a matching document, even after all other modules gave up.
It does its work by comparing each document name in the
requested directory against the requested document name
<strong>without regard to case</strong>, and allowing
<strong>up to one misspelling</strong> (character insertion /
omission / transposition or wrong character). A list is built
with all document names which were matched using this
strategy. <strong>Erroneous extension</strong> can also be fixed
by this module.</p>
<p>If, after scanning the directory,</p>
<ul>
<li>no matching document was found, Apache will proceed as
usual and return an error (<code>404 - document not found</code>).</li>
<li>only one document is found that "almost" matches the
request, then it is returned in the form of a redirection
response (<code>301 - Moved Permanently</code>).</li>
<li>more than one document with a close match was found, then
the list of the matches is returned to the client, and the
client can select the correct candidate (<code>300 - Multiple
Choices</code>).</li>
</ul>
</summary>
<directivesynopsis>
<name>CheckSpelling</name>
<description>Enables the spelling
module</description>
<syntax>CheckSpelling on|off</syntax>
<default>CheckSpelling Off</default>
<contextlist>
<context>server config</context>
<context>virtual host</context>
<context>directory</context>
<context>.htaccess</context>
</contextlist>
<override>Options</override>
<usage>
<p>This directive enables or disables the spelling module. When
enabled, keep in mind that</p>
<ul>
<li>the directory scan which is necessary for the spelling
correction will have an impact on the server's performance
when many spelling corrections have to be performed at the
same time.</li>
<li>the document trees should not contain sensitive files
which could be matched inadvertently by a spelling
"correction".</li>
<li>the module is unable to correct misspelled user names (as
in <code>http://my.host/~apahce/</code>), just file names or
directory names.</li>
<li>spelling corrections apply strictly to existing files, so
a request for the <code><Location /status></code> may
get incorrectly treated as the negotiated file
"<code>/stats.html</code>".</li>
</ul>
<!-- XXX: is that really true?! -nd -->
<p><module>mod_speling</module> should not be enabled in <a href="mod_dav.html">DAV</a>
enabled directories, because it will try to "spell fix" newly created
resource names against existing filenames, e.g., when trying to upload
a new document <code>doc43.html</code> it might redirect to an existing
document <code>doc34.html</code>, which is not what was intended.
</p>
</usage>
</directivesynopsis>
<directivesynopsis>
<name>CheckCaseOnly</name>
<description>Limits the action of the speling module to case corrections</description>
<syntax>CheckCaseOnly on|off</syntax>
<default>CheckCaseOnly Off</default>
<contextlist>
<context>server config</context>
<context>virtual host</context>
<context>directory</context>
<context>.htaccess</context>
</contextlist>
<override>Options</override>
<usage>
<p>When set, this directive limits the action of the spelling correction
to lower/upper case changes. Other potential corrections are not performed,
except when <directive module="mod_speling">CheckBasenameMatch</directive> is also set.</p>
</usage>
</directivesynopsis>
<directivesynopsis>
<name>CheckBasenameMatch</name>
<description>Also match files with differing file name extensions.</description>
<syntax>CheckBasenameMatch on|off</syntax>
<default>CheckBasenameMatch On</default>
<contextlist>
<context>server config</context>
<context>virtual host</context>
<context>directory</context>
<context>.htaccess</context>
</contextlist>
<override>Options</override>
<usage>
<p>When set, this directive extends the action of the spelling correction
to the file name extension. For example a file <code>foo.gif</code> will
match a request for <code>foo</code> or <code>foo.jpg</code>. This can be
particularly useful in conjunction with
<a href="../content-negotiation.html">MultiViews</a>.</p>
</usage>
</directivesynopsis>
</modulesynopsis>
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