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286 lines
8.0 KiB
HTML
286 lines
8.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Apache module mod_charset_lite</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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<!--#include virtual="header.html" -->
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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
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HREF="module-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Experimental
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<BR>
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<A
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HREF="module-dict.html#SourceFile"
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REL="Help"
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><STRONG>Source File:</STRONG></A> mod_charset_lite.c
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<BR>
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<A
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HREF="module-dict.html#ModuleIdentifier"
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REL="Help"
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><STRONG>Module Identifier:</STRONG></A> charset_lite_module
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</P>
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<H2>Summary</H2>
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<P>
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This is an <STRONG>experimental</STRONG> module and should be used with
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care. Experiment with your <CODE>mod_charset_lite</CODE> configuration to
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ensure that it performs the desired function.
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</P>
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<P>
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<CODE>mod_charset_lite</CODE> allows the administrator to specify the
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source character set of objects as well as the character set they should
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be translated into before sending to the client.
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<CODE>mod_charset_lite</CODE> does not translate the data itself but
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instead tells Apache what translation to perform.
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<CODE>mod_charset_lite</CODE> is applicable to EBCDIC and ASCII
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host environments. In an EBCDIC environment, Apache normally translates
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text content from the code page of the Apache process locale to
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ISO-8859-1. <CODE>mod_charset_lite</CODE> can be used to specify that
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a different translation is to be performed. In an ASCII environment,
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Apache normally performs no translation, so <CODE>mod_charset_lite</CODE>
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is needed in order for any translation to take place.
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</P>
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<p>This module will only work if <code>APACHE_XLATE</code> is defined
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at compile time.</p>
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<P>
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This module provides a small subset of configuration mechanisms
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implemented by Russian Apache and its associated <CODE>mod_charset</CODE>.
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</P>
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<H2>Directives</H2>
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<UL>
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<LI><A HREF="#charsetsourceenc">CharsetSourceEnc</A>
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<LI><A HREF="#charsetdefault">CharsetDefault</A>
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<LI><A HREF="#charsetoptions">CharsetOptions</A>
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</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>
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The character set name parameters of CharsetSourceEnc and CharsetDefault
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must be acceptable to the translation mechanism used by APR on the system
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where mod_charset_lite is deployed. These character set names are not
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standardized and are usually not the same as the corresponding values used
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in http headers. Currently, APR can only use iconv(3), so you can easily
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test your character set names using the iconv(1) program, as follows:
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</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 rules</H3>
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<P>
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If the translation rules don't make sense for the content, translation
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can fail in various ways, including:
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</P>
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<SL>
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<LI>
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The translation mechanism may return a bad return code, and the connection
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will be aborted.
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<LI>
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The translation mechanism may silently place special characters (e.g., question
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marks) in the output buffer when it cannot translate the input buffer.
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</SL>
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<HR>
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<H2><A NAME="charsetsourceenc">CharsetSourceEnc</A></H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> CharsetSourceEnc <EM>charset</EM>
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<BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <EM>None</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, virtual host
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<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> <EM>FileInfo</EM>
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<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Experimental
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<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_charset_lite
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<BR>
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<P>
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The <CODE>CharsetSourceEnc</CODE> directive specifies the source charset
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of files in the associated container.
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</P>
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<P>
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The value of the <EM>charset</EM> argument must be accepted as a valid
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character set name by the character set support in APR. Generally, this
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means that it must be supported by iconv.
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</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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<P>
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<hr>
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<H2><A NAME="charsetdefault">CharsetDefault</A></H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> CharsetDefault <EM>charset</EM>
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<BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <EM>None</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, virtual host
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<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> <EM>FileInfo</EM>
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<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Experimental
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<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_charset_lite
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<BR>
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<P>
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The <CODE>CharsetDefault</CODE> directive specifies the charset that
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content in the associated container should be translated to.
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</P>
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<P>
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The value of the <EM>charset</EM> argument must be accepted as a valid
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character set name by the character set support in APR. Generally, this
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means that it must be supported by iconv.
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</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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<P>
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<hr>
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<H2><A NAME="charsetoptions">CharsetOptions</A></H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> CharsetOptions <EM>option</em>
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[<em>option</em>] ...
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<BR>
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<A
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HREF="directive-dict.html#Default"
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REL="Help"
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><STRONG>Default:</STRONG></A> <EM>DebugLevel=0</EM> <EM>NoImplicitAdd</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> directory, virtual host
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<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> <EM>FileInfo</EM>
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<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Experimental
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<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_charset_lite
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<BR>
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<P>
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The <CODE>CharsetOptions</CODE> directive configures certain behaviors
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of <CODE>mod_charset_lite</CODE>. <EM>Option</EM> can be one of
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<DL>
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<DT>DebugLevel=<EM>n</EM>
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<DD>
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The <SAMP>DebugLevel</SAMP> keyword allows you to specify the level of
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debug messages generated by <CODE>mod_charset_lite</CODE>. By default, no
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messages are generated. This is equivalent to <SAMP>DebugLevel=0</SAMP>.
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With higher numbers, more debug messages are generated, and server
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performance will be degraded. The actual meanings of the numeric values
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are described with the definitions of the DBGLVL_ constants near the
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beginning of <CODE>mod_charset_lite.c</CODE>.
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<DT>ImplicitAdd | NoImplicitAdd
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<DD>
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The <SAMP>ImplicitAdd</SAMP> keyword specifies that
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<CODE>mod_charset_lite</CODE> should implicitly insert its filter when
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the configuration specifies that the character set of content should be
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translated. If the filter chain is explicitly configured using the
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AddOutputFilter directive, <SAMP>NoImplicitAdd</SAMP> should be specified so
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that <CODE>mod_charset_lite</CODE> doesn't add its filter.
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</DL>
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</P>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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