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590 lines
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XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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-->
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<title>The Apache EBCDIC Port - Apache HTTP Server</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body id="manual-page"><div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.3</p>
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<img alt="" src="../images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.3</a> > <a href="./">Platform Specific Notes</a></div><div id="page-content"><div id="preamble"><h1>The Apache EBCDIC Port</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/platform/ebcdic.html" title="English"> en </a> |
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<a href="../ko/platform/ebcdic.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div>
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<div class="warning"><strong>Warning:</strong> This document
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has not been updated to take into account changes made in
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the 2.0 version of the Apache HTTP Server. Some of the
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information may still be relevant, but please use it with care.
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</div>
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</div>
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<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#overview">Overview of the Apache EBCDIC Port</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#design">Design Goals</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#technical">Technical Solution</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#porting">Porting Notes</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#document">Document Storage Notes</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#modules">Apache Modules' Status</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#third-party">Third Party Modules' Status</a></li>
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</ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="overview" id="overview">Overview of the Apache EBCDIC Port</a></h2>
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<p>Version 1.3 of the Apache HTTP Server was the first version
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which included a port to a (non-ASCII) mainframe machine which
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uses the EBCDIC character set as its native codeset.</p>
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<p>(It is the SIEMENS family of mainframes running the <a href="http://www.siemens.de/servers/bs2osd/osdbc_us.htm">BS2000/OSD
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operating system</a>. This mainframe OS nowadays features a
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SVR4-derived POSIX subsystem).</p>
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<p>The port was started initially to</p>
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<ul>
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<li>prove the feasibility of porting <a href="http://httpd.apache.org/">the Apache HTTP server</a> to
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this platform</li>
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<li>find a "worthy and capable" successor for the venerable
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<a href="http://www.w3.org/Daemon/">CERN-3.0</a> daemon
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(which was ported a couple of years ago), and to</li>
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<li>prove that Apache's preforking process model can on this
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platform easily outperform the accept-fork-serve model used
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by CERN by a factor of 5 or more.</li>
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</ul>
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<p>This document serves as a rationale to describe some of the
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design decisions of the port to this machine.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="design" id="design">Design Goals</a></h2>
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<p>One objective of the EBCDIC port was to maintain enough
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backwards compatibility with the (EBCDIC) CERN server to make
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the transition to the new server attractive and easy. This
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required the addition of a configurable method to define
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whether a HTML document was stored in ASCII (the only format
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accepted by the old server) or in EBCDIC (the native document
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format in the POSIX subsystem, and therefore the only realistic
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format in which the other POSIX tools like <code>grep</code> or
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<code>sed</code> could operate on the documents). The current
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solution to this is a "pseudo-MIME-format" which is intercepted
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and interpreted by the Apache server (see below). Future versions
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might solve the problem by defining an "ebcdic-handler" for all
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documents which must be converted.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="technical" id="technical">Technical Solution</a></h2>
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<p>Since all Apache input and output is based upon the BUFF
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data type and its methods, the easiest solution was to add the
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conversion to the BUFF handling routines. The conversion must
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be settable at any time, so a BUFF flag was added which defines
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whether a BUFF object has currently enabled conversion or not.
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This flag is modified at several points in the HTTP
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protocol:</p>
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<ul>
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<li><strong>set</strong> before a request is received
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(because the request and the request header lines are always
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in ASCII format)</li>
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<li><strong>set/unset</strong> when the request body is
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received - depending on the content type of the request body
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(because the request body may contain ASCII text or a binary
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file)</li>
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<li><strong>set</strong> before a reply header is sent
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(because the response header lines are always in ASCII
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format)</li>
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<li><strong>set/unset</strong> when the response body is sent
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- depending on the content type of the response body (because
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the response body may contain text or a binary file)</li>
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</ul>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="porting" id="porting">Porting Notes</a></h2>
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<ol>
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<li>
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<p>The relevant changes in the source are <code>#ifdef</code>'ed
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into two categories:</p>
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<dl>
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<dt><code><strong>#ifdef
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CHARSET_EBCDIC</strong></code></dt>
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<dd>
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<p>Code which is needed for any EBCDIC based machine.
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This includes character translations, differences in
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contiguity of the two character sets, flags which
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indicate which part of the HTTP protocol has to be
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converted and which part doesn't <em>etc.</em></p>
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</dd>
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<dt><code><strong>#ifdef _OSD_POSIX</strong></code></dt>
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<dd>
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<p>Code which is needed for the SIEMENS BS2000/OSD
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mainframe platform only. This deals with include file
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differences and socket implementation topics which are
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only required on the BS2000/OSD platform.</p>
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</dd>
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</dl>
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</li>
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<li>
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<p>The possibility to translate between ASCII and EBCDIC at
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the socket level (on BS2000 POSIX, there is a socket option
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which supports this) was intentionally <em>not</em> chosen,
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because the byte stream at the HTTP protocol level consists
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of a mixture of protocol related strings and non-protocol
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related raw file data. HTTP protocol strings are always
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encoded in ASCII (the <code>GET</code> request, any Header: lines,
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the chunking information <em>etc.</em>) whereas the file transfer
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parts (<em>i.e.</em>, GIF images, CGI output <em>etc.</em>)
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should usually be just "passed through" by the server. This
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separation between "protocol string" and "raw data" is
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reflected in the server code by functions like <code>bgets()</code>
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or <code>rvputs()</code> for strings, and functions like
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<code>bwrite()</code> for binary data. A global translation
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of everything would therefore be inadequate.</p>
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<p>(In the case of text files of course, provisions must be
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made so that EBCDIC documents are always served in
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ASCII)</p>
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</li>
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<li>
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<p>This port therefore features a built-in protocol level
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conversion for the server-internal strings (which the
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compiler translated to EBCDIC strings) and thus for all
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server-generated documents. The hard coded ASCII escapes
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<code>\012</code> and <code>\015</code> which are ubiquitous
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in the server code are an exception: they are already the binary
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encoding of the ASCII <code>\n</code> and <code>\r</code> and
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must not be converted to ASCII a second time.
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This exception is only relevant for server-generated strings;
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and <em>external</em> EBCDIC documents are not expected to
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contain ASCII newline characters.</p>
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</li>
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<li>
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<p>By examining the call hierarchy for the BUFF management
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routines, I added an "ebcdic/ascii conversion layer" which
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would be crossed on every puts/write/get/gets, and a
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conversion flag which allowed enabling/disabling the
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conversions on-the-fly. Usually, a document crosses this
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layer twice from its origin source (a file or CGI output) to
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its destination (the requesting client): <code>file ->
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Apache</code>, and <code>Apache -> client</code>.</p>
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<p>The server can now read the header lines of a CGI-script
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output in EBCDIC format, and then find out that the remainder
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of the script's output is in ASCII (like in the case of the
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output of a WWW Counter program: the document body contains a
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GIF image). All header processing is done in the native
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EBCDIC format; the server then determines, based on the type
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of document being served, whether the document body (except
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for the chunking information, of course) is in ASCII already
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or must be converted from EBCDIC.</p>
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</li>
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<li>
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<p>For Text documents (MIME types text/plain, text/html
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<em>etc.</em>), an implicit translation to ASCII can be
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used, or (if the users prefer to store some documents in
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raw ASCII form for faster serving, or because the files
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reside on a NFS-mounted directory tree) can be served
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without conversion.</p>
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<p><strong>Example:</strong></p>
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<p>to serve files with the suffix <code>.ahtml</code> as a
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raw ASCII <code>text/html</code> document without implicit
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conversion (and suffix <code>.ascii</code> as ASCII
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<code>text/plain</code>), use the directives:</p>
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<div class="example"><p><code>
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AddType text/x-ascii-html .ahtml <br />
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AddType text/x-ascii-plain .ascii
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</code></p></div>
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<p>Similarly, any <code>text/foo</code> MIME type can be
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served as "raw ASCII" by configuring a MIME type
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"<code>text/x-ascii-foo</code>" for it using
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<code>AddType</code>.</p>
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</li>
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<li>
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<p>Non-text documents are always served "binary" without
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conversion. This seems to be the most sensible choice for,
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.<em>e.g.</em>, GIF/ZIP/AU file types. This of course
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requires the user to copy them to the mainframe host using
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the "<code>rcp -b</code>" binary switch.</p>
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</li>
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<li>
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<p>Server parsed files are always assumed to be in native
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(<em>i.e.</em>, EBCDIC) format as used on the machine, and
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are converted after processing.</p>
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</li>
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<li>
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<p>For CGI output, the CGI script determines whether a
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conversion is needed or not: by setting the appropriate
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Content-Type, text files can be converted, or GIF output can
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be passed through unmodified. An example for the latter case
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is the wwwcount program which we ported as well.</p>
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</li>
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</ol>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="document" id="document">Document Storage Notes</a></h2>
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<h3><a name="binary" id="binary">Binary Files</a></h3>
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<p>All files with a <code>Content-Type:</code> which does not
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start with <code>text/</code> are regarded as <em>binary
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files</em> by the server and are not subject to any conversion.
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Examples for binary files are GIF images, gzip-compressed files
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and the like.</p>
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<p>When exchanging binary files between the mainframe host and
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a Unix machine or Windows PC, be sure to use the ftp "binary"
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(<code>TYPE I</code>) command, or use the
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<code>rcp -b</code> command from the mainframe host (the
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<code>-b</code> switch is not supported in unix
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<code>rcp</code>'s).</p>
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<h3><a name="text" id="text">Text Documents</a></h3>
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<p>The default assumption of the server is that Text Files
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(<em>i.e.</em>, all files whose <code>Content-Type:</code>
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starts with <code>text/</code>) are stored in the native
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character set of the host, EBCDIC.</p>
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<h3><a name="ssi" id="ssi">Server Side Included Documents</a></h3>
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<p>SSI documents must currently be stored in EBCDIC only.
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No provision is made to convert it from ASCII before
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processing.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="modules" id="modules">Apache Modules' Status</a></h2>
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<table class="bordered">
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<tr>
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<th>Module</th>
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<th>Status</th>
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<th>Notes</th>
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/core.html">core</a></code></td>
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<td class="centered">+</td>
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_access.html">mod_access</a></code></td>
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<td class="centered">+</td>
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_actions.html">mod_actions</a></code></td>
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<td class="centered">+</td>
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code></td>
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<td class="centered">+</td>
|
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_asis.html">mod_asis</a></code></td>
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<td class="centered">+</td>
|
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_auth.html">mod_auth</a></code></td>
|
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<td class="centered">+</td>
|
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_authn_anon.html">mod_authn_anon</a></code></td>
|
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<td class="centered">+</td>
|
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<td />
|
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_authn_dbm.html">mod_authn_dbm</a></code></td>
|
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<td class="centered">?</td>
|
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<td>with own <code>libdb.a</code></td>
|
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_authz_dbm.html">mod_authz_dbm</a></code></td>
|
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<td class="centered">?</td>
|
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<td>with own <code>libdb.a</code></td>
|
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</tr>
|
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|
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<tr>
|
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<td><code class="module"><a href="../mod/mod_autoindex.html">mod_autoindex</a></code></td>
|
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<td class="centered">+</td>
|
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<td />
|
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</tr>
|
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|
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<tr>
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<td><code class="module"><a href="../mod/mod_cern_meta.html">mod_cern_meta</a></code></td>
|
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<td class="centered">?</td>
|
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<td />
|
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</tr>
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|
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<tr>
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<td><code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code></td>
|
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<td class="centered">+</td>
|
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<td />
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</tr>
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<tr>
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<td><code>mod_digest</code></td>
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<td class="centered">+</td>
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_dir.html">mod_dir</a></code></td>
|
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<td class="centered">+</td>
|
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_so.html">mod_so</a></code></td>
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<td class="centered">-</td>
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<td>no shared libs</td>
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_env.html">mod_env</a></code></td>
|
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<td class="centered">+</td>
|
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_example.html">mod_example</a></code></td>
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<td class="centered">-</td>
|
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<td>(test bed only)</td>
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_expires.html">mod_expires</a></code></td>
|
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<td class="centered">+</td>
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code></td>
|
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<td class="centered">+</td>
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<td />
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</tr>
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<tr>
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<td><code class="module"><a href="../mod/mod_imagemap.html">mod_imagemap</a></code></td>
|
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<td class="centered">+</td>
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<td />
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</tr>
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|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_include.html">mod_include</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_info.html">mod_info</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code>mod_log_agent</code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code>mod_log_config</code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_log_referer.html">mod_log_referer</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_mime.html">mod_mime</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_mime_magic.html">mod_mime_magic</a></code></td>
|
|
<td class="centered">?</td>
|
|
<td>not ported yet</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_negotiation.html">mod_negotiation</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td>untested</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_speling.html">mod_speling</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_status.html">mod_status</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_unique_id.html">mod_unique_id</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_userdir.html">mod_userdir</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td />
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code class="module"><a href="../mod/mod_usertrack.html">mod_usertrack</a></code></td>
|
|
<td class="centered">?</td>
|
|
<td>untested</td>
|
|
</tr>
|
|
</table>
|
|
|
|
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
|
|
<div class="section">
|
|
<h2><a name="third-party" id="third-party">Third Party Modules' Status</a></h2>
|
|
|
|
|
|
|
|
<table class="bordered">
|
|
<tr>
|
|
<th>Module</th>
|
|
<th>Status</th>
|
|
<th>Notes</th>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code><a href="http://java.apache.org/">mod_jserv</a>
|
|
</code></td>
|
|
<td class="centered">-</td>
|
|
<td>JAVA still being ported.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code><a href="http://www.php.net/">mod_php3</a></code></td>
|
|
<td class="centered">+</td>
|
|
<td><code>mod_php3</code> runs fine, with LDAP and GD
|
|
and FreeType libraries.</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code><a href="http://hpwww.ec-lyon.fr/~vincent/apache/mod_put.html">mod_put</a></code></td>
|
|
<td class="centered">?</td>
|
|
<td>untested</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td><code><a href="ftp://hachiman.vidya.com/pub/apache/">mod_session</a></code></td>
|
|
<td class="centered">-</td>
|
|
<td>untested</td>
|
|
</tr>
|
|
</table>
|
|
|
|
</div></div>
|
|
<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/platform/ebcdic.html" title="English"> en </a> |
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<a href="../ko/platform/ebcdic.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div><div id="footer">
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<p class="apache">Copyright 2011 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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