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<title>mod_speling - Apache HTTP Server Version 2.4</title>
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<div id="preamble"><h1>Apache Module mod_speling</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_speling.html" title="English"> en </a> |
<a href="../fr/mod/mod_speling.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
<a href="../ja/mod/mod_speling.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="../ko/mod/mod_speling.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Attempts to correct mistaken URLs by ignoring
capitalization, or attempting to correct various minor
misspellings.</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>speling_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_speling.c</td></tr></table>
<h3>Summary</h3>
<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>
</div>
<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#checkbasenamematch">CheckBasenameMatch</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#checkcaseonly">CheckCaseOnly</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#checkspelling">CheckSpelling</a></li>
</ul>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_speling">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_speling">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CheckBasenameMatch" id="CheckBasenameMatch">CheckBasenameMatch</a> <a name="checkbasenamematch" id="checkbasenamematch">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Also match files with differing file name extensions.</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CheckBasenameMatch on|off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CheckBasenameMatch On</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Options</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_speling</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.50 and later</td></tr>
</table>
<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>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CheckCaseOnly" id="CheckCaseOnly">CheckCaseOnly</a> <a name="checkcaseonly" id="checkcaseonly">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Limits the action of the speling module to case corrections</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CheckCaseOnly on|off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CheckCaseOnly Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Options</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_speling</td></tr>
</table>
<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 <code class="directive"><a href="#checkbasenamematch">CheckBasenameMatch</a></code> is also set.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CheckSpelling" id="CheckSpelling">CheckSpelling</a> <a name="checkspelling" id="checkspelling">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables the spelling
module</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CheckSpelling on|off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CheckSpelling Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>Options</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_speling</td></tr>
</table>
<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>
<p><code class="module"><a href="../mod/mod_speling.html">mod_speling</a></code> 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>
</div>
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