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e503691502
get rid of an ancient work-around for a problem with apr_heap_create git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92410 13f79535-47bb-0310-9956-ffa450edef68
230 lines
8.4 KiB
HTML
230 lines
8.4 KiB
HTML
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<meta name="generator" content="HTML Tidy, see www.w3.org" />
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<title>Apache module mod_charset_lite</title>
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<h1 align="CENTER">Module mod_charset_lite</h1>
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<p>This module provides the ability to specify character set
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translation or recoding.</p>
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<p><a href="module-dict.html#Status"
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rel="Help"><strong>Status:</strong></a> Experimental<br />
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<a href="module-dict.html#SourceFile"
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rel="Help"><strong>Source File:</strong></a>
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mod_charset_lite.c<br />
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<a href="module-dict.html#ModuleIdentifier"
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rel="Help"><strong>Module Identifier:</strong></a>
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charset_lite_module</p>
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<h2>Summary</h2>
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<p>This is an <strong>experimental</strong> module and should
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be used with care. Experiment with your
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<code>mod_charset_lite</code> configuration to ensure that it
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performs the desired function.</p>
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<p><code>mod_charset_lite</code> allows the administrator to
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specify the source character set of objects as well as the
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character set they should be translated into before sending to
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the client. <code>mod_charset_lite</code> does not translate
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the data itself but instead tells Apache what translation to
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perform. <code>mod_charset_lite</code> is applicable to EBCDIC
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and ASCII host environments. In an EBCDIC environment, Apache
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normally translates text content from the code page of the
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Apache process locale to ISO-8859-1.
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<code>mod_charset_lite</code> can be used to specify that a
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different translation is to be performed. In an ASCII
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environment, Apache normally performs no translation, so
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<code>mod_charset_lite</code> is needed in order for any
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translation to take place.</p>
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<p>This module provides a small subset of configuration
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mechanisms implemented by Russian Apache and its associated
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<code>mod_charset</code>.</p>
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<h2>Directives</h2>
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<ul>
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<li><a href="#charsetsourceenc">CharsetSourceEnc</a></li>
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<li><a href="#charsetdefault">CharsetDefault</a></li>
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<li><a href="#charsetoptions">CharsetOptions</a></li>
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</ul>
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<h2>Common Problems</h2>
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<h3>Invalid character set names</h3>
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<p>The character set name parameters of CharsetSourceEnc and
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CharsetDefault must be acceptable to the translation mechanism
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used by APR on the system where mod_charset_lite is deployed.
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These character set names are not standardized and are usually
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not the same as the corresponding values used in http headers.
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Currently, APR can only use iconv(3), so you can easily test
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your character set names using the iconv(1) program, as
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follows:</p>
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<pre>
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iconv -f charsetsourceenc-value -t charsetdefault-value
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</pre>
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<h3>Mismatch between character set of content and translation
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rules</h3>
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<p>If the translation rules don't make sense for the content,
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translation can fail in various ways, including:</p>
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<ul>
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<li>The translation mechanism may return a bad return code,
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and the connection will be aborted.</li>
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<li>The translation mechanism may silently place special
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characters (e.g., question marks) in the output buffer when
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it cannot translate the input buffer.</li>
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</ul>
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<hr />
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<h2><a id="charsetsourceenc"
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name="charsetsourceenc">CharsetSourceEnc</a></h2>
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<p><a href="directive-dict.html#Syntax"
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rel="Help"><strong>Syntax:</strong></a> CharsetSourceEnc
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<em>charset</em><br />
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<a href="directive-dict.html#Default"
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rel="Help"><strong>Default:</strong></a> <em>None</em><br />
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<a href="directive-dict.html#Context"
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rel="Help"><strong>Context:</strong></a> directory, virtual
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host<br />
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<a href="directive-dict.html#Override"
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rel="Help"><strong>Override:</strong></a>
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<em>FileInfo</em><br />
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<a href="directive-dict.html#Status"
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rel="Help"><strong>Status:</strong></a> Experimental<br />
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<a href="directive-dict.html#Module"
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rel="Help"><strong>Module:</strong></a> mod_charset_lite<br />
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</p>
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<p>The <code>CharsetSourceEnc</code> directive specifies the
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source charset of files in the associated container.</p>
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<p>The value of the <em>charset</em> argument must be accepted
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as a valid character set name by the character set support in
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APR. Generally, this means that it must be supported by
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iconv.</p>
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Example:
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<pre>
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<Directory "/export/home/trawick/apacheinst/htdocs/convert">
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CharsetSourceEnc UTF-16BE
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CharsetDefault ISO8859-1
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</Directory>
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</pre>
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The character set names in this example work with the iconv
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translation support in Solaris 8.
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<hr />
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<h2><a id="charsetdefault"
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name="charsetdefault">CharsetDefault</a></h2>
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<p><a href="directive-dict.html#Syntax"
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rel="Help"><strong>Syntax:</strong></a> CharsetDefault
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<em>charset</em><br />
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<a href="directive-dict.html#Default"
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rel="Help"><strong>Default:</strong></a> <em>None</em><br />
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<a href="directive-dict.html#Context"
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rel="Help"><strong>Context:</strong></a> directory, virtual
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host<br />
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<a href="directive-dict.html#Override"
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rel="Help"><strong>Override:</strong></a>
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<em>FileInfo</em><br />
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<a href="directive-dict.html#Status"
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rel="Help"><strong>Status:</strong></a> Experimental<br />
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<a href="directive-dict.html#Module"
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rel="Help"><strong>Module:</strong></a> mod_charset_lite<br />
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</p>
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<p>The <code>CharsetDefault</code> directive specifies the
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charset that content in the associated container should be
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translated to.</p>
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<p>The value of the <em>charset</em> argument must be accepted
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as a valid character set name by the character set support in
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APR. Generally, this means that it must be supported by
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iconv.</p>
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Example:
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<pre>
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<Directory "/export/home/trawick/apacheinst/htdocs/convert">
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CharsetSourceEnc UTF-16BE
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CharsetDefault ISO8859-1
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</Directory>
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</pre>
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<hr />
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<h2><a id="charsetoptions"
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name="charsetoptions">CharsetOptions</a></h2>
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<p><a href="directive-dict.html#Syntax"
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rel="Help"><strong>Syntax:</strong></a> CharsetOptions
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<em>option</em> [<em>option</em>] ...<br />
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<a href="directive-dict.html#Default"
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rel="Help"><strong>Default:</strong></a> <em>DebugLevel=0</em>
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<em>NoImplicitAdd</em><br />
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<a href="directive-dict.html#Context"
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rel="Help"><strong>Context:</strong></a> directory, virtual
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host<br />
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<a href="directive-dict.html#Override"
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rel="Help"><strong>Override:</strong></a>
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<em>FileInfo</em><br />
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<a href="directive-dict.html#Status"
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rel="Help"><strong>Status:</strong></a> Experimental<br />
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<a href="directive-dict.html#Module"
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rel="Help"><strong>Module:</strong></a> mod_charset_lite<br />
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</p>
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<p>The <code>CharsetOptions</code> directive configures certain
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behaviors of <code>mod_charset_lite</code>. <em>Option</em> can
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be one of</p>
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<dl>
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<dt>DebugLevel=<em>n</em></dt>
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<dd>The <samp>DebugLevel</samp> keyword allows you to specify
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the level of debug messages generated by
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<code>mod_charset_lite</code>. By default, no messages are
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generated. This is equivalent to <samp>DebugLevel=0</samp>.
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With higher numbers, more debug messages are generated, and
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server performance will be degraded. The actual meanings of
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the numeric values are described with the definitions of the
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DBGLVL_ constants near the beginning of
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<code>mod_charset_lite.c</code>.</dd>
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<dt>ImplicitAdd | NoImplicitAdd</dt>
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<dd>The <samp>ImplicitAdd</samp> keyword specifies that
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<code>mod_charset_lite</code> should implicitly insert its
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filter when the configuration specifies that the character
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set of content should be translated. If the filter chain is
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explicitly configured using the AddOutputFilter directive,
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<samp>NoImplicitAdd</samp> should be specified so that
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<code>mod_charset_lite</code> doesn't add its filter.</dd>
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</dl>
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<br />
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<br />
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</body>
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</html>
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