262 lines
17 KiB
HTML
262 lines
17 KiB
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Title" content="Module mod_deflate" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2002,2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2002,2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Module mod_deflate</title>
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</head>
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<body id="rzaiemod_deflate"><a name="rzaiemod_deflate"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Module mod_deflate</h1>
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<div><div class="important"><span class="importanttitle">Important:</span> Information
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for this topic supports the latest PTF levels for HTTP Server for i5/OS .
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It is recommended that you install the latest PTFs to upgrade to the latest
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level of the HTTP Server for i5/OS. Some of the topics documented here are
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not available prior to this update. See <a href="http://www-03.ibm.com/servers/eserver/iseries/software/http/services/service.html" target="_blank">http://www.ibm.com/servers/eserver/iseries/software/http/services/service.htm</a> <img src="www.gif" alt="Link outside Information Center" /> for more information. </div>
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<p><strong>Summary</strong></p>
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<p>Module mod_deflate specifies compression and decompression functions using
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filters, MIME types, environment variables, and HTTP responses. Compressed
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output is transferred to requesting client browsers at a higher rate of speed
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than uncompressed output. Compression and decompression is implemented by
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the DEFLATE filter, located in module mod_deflate. See <a href="http://httpd.apache.org/docs-2.0/mod/mod_deflate.html" target="_blank">Apache
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HTTP Server Version 2.0 Documentation</a> <img src="www.gif" alt="Link outside Information Center" /> for additional information and examples on configuring the
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Apache server to use compression.</p>
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<p><strong>Directives</strong></p>
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<ul><li><a href="#deflatebuffersize">DeflateBufferSize</a></li>
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<li><a href="#deflatecompressionlevel">DeflateCompressionLevel</a></li>
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<li><a href="#deflatefilternote">DeflateFilterNote</a></li>
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<li><a href="#deflatememlevel">DeflateMemLevel</a></li>
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<li><a href="#deflatewindowsize">DeflateWindowSize</a></li>
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</ul>
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</div>
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<div class="hr" id="deflatebuffersize"><a name="deflatebuffersize"><!-- --></a><h2 class="topictitle2">DeflateBufferSize</h2>
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<div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><tbody><tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Module">Module</a></strong>: mod_deflate</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Syntax">Syntax</a></strong>: DeflateBufferSize <em>value</em></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Default">Default</a></strong>: DeflateBufferSize 8096</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Context">Context</a></strong>: <span id="deflatebuffersize__deflatebuffersize_context"><a name="deflatebuffersize__deflatebuffersize_context"><!-- --></a>server
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config, virtual host</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Override">Override</a></strong>: none</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Origin">Origin</a></strong>: <span id="deflatebuffersize__deflatebuffersize_origin"><a name="deflatebuffersize__deflatebuffersize_origin"><!-- --></a>Apache</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__UsageConsiderations">Usage Considerations</a></strong>: A LoadModule is required in
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the configuration file prior to using the directive. The statement should
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be as follows: deflate_module /QSYS.LIB/QHTTPSVR.LIB/QZSRCORE.SRVPGM</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateBufferSize 8096</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>The DeflateBufferSize directive specifies the size of the fragments that
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zlib should compress at one time.</p>
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<blockquote><dl class="dlexpand"><dt class="dltermexpand"><strong>Parameter</strong>: <em>value</em></dt>
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<dd><ul><li>The <em>value</em> parameter specifies the size, in bytes, of the fragments
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that zlib should compress at one time.</li>
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</ul>
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</dd>
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</dl>
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</blockquote>
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</div>
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</div>
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<div class="hr" id="deflatecompressionlevel"><a name="deflatecompressionlevel"><!-- --></a><h2 class="topictitle2">DeflateCompressionLevel</h2>
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<div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><tbody><tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Module">Module</a></strong>: mod_deflate</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Syntax">Syntax</a></strong>: DeflateCompressionLevel <em>value</em></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Default">Default</a></strong>: DeflateCompressionLevel 6</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Context">Context</a></strong>: <span id="deflatecompressionlevel__deflatecompressionlevel_context"><a name="deflatecompressionlevel__deflatecompressionlevel_context"><!-- --></a>server
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config, virtual host</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Override">Override</a></strong>: none</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Origin">Origin</a></strong>: <span id="deflatecompressionlevel__deflatecompressionlevel_origin"><a name="deflatecompressionlevel__deflatecompressionlevel_origin"><!-- --></a>Apache</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__UsageConsiderations">Usage Considerations</a></strong>: A LoadModule is required in
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the configuration file prior to using the directive. The statement should
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be as follows: deflate_module /QSYS.LIB/QHTTPSVR.LIB/QZSRCORE.SRVPGM</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateCompressionLevel 5</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>The DeflateCompressionLevel directive specifies what level of compression
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should be used.</p>
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<blockquote><dl class="dlexpand"><dt class="dltermexpand"><strong>Parameter</strong>: <em>value</em></dt>
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<dd><ul><li>The <em>value</em> parameter value specifies the level of compression.
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The higher the value, the greater the compression.<div class="note"><span class="notetitle">Note:</span> Higher compression
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levels require additional CPU time.</div>
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</li>
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</ul>
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</dd>
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</dl>
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</blockquote>
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</div>
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</div>
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<div class="hr" id="deflatefilternote"><a name="deflatefilternote"><!-- --></a><h2 class="topictitle2">DeflateFilterNote</h2>
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<div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><tbody><tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Module">Module</a></strong>: mod_deflate</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Syntax">Syntax</a></strong>: DeflateFilterNote <em>[type]</em> <em>notename</em></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Default">Default</a></strong>: none</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Context">Context</a></strong>: <span id="deflatefilternote__deflatefilternote_context"><a name="deflatefilternote__deflatefilternote_context"><!-- --></a>server
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config, virtual host</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Override">Override</a></strong>: none</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Origin">Origin</a></strong>: <span id="deflatefilternote__deflatefilternote_origin"><a name="deflatefilternote__deflatefilternote_origin"><!-- --></a>Apache</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__UsageConsiderations">Usage Considerations</a></strong>: A LoadModule is required in
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the configuration file prior to using the directive. The statement should
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be as follows: deflate_module /QSYS.LIB/QHTTPSVR.LIB/QZSRCORE.SRVPGM</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateFilterNote ratio</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateFilterNote Ratio ratio</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateFilterNote Input input</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateFilterNote input input</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>The DeflateFilterNote directive specifies that a note about compression
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ratios should be attached to the request. The note is used for statistical
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purposes by adding a value to your access log.</p>
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<blockquote><dl class="dlexpand"><dt class="dltermexpand"><strong>Parameter One</strong>: <em>type</em></dt>
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<dd><ul><li>The <em>type</em> parameter value specifies what type of data is added to
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the note for logging. The parameter value is not case-sensitive. Possible
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values include:<dl class="dlexpand"><dt class="dltermexpand">Input </dt>
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<dd>Store the byte count of the filter's input stream in the note. </dd>
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<dt class="dltermexpand">Output</dt>
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<dd>Store the byte count of the filter's output stream in the note. </dd>
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<dt class="dltermexpand">Ratio</dt>
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<dd>Store the compression ratio (output/input * 100) in the note. This is
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the default, if the type argument is omitted. </dd>
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</dl>
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</li>
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</ul>
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</dd>
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</dl>
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<dl><dt class="dlterm"><strong>Parameter Two</strong>: <em>notename</em></dt>
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<dd><ul><li>The <em>notename</em> parameter value specifies the note name entered in
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the log. The <em>notename</em> value is not required to match the <em>type</em> value.
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Blank characters are not valid.</li>
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</ul>
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</dd>
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</dl>
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<dl><dt class="dlterm"><strong>Example</strong>: accurate logging</dt>
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<dd><pre>DeflateFilterNote Input instream
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DeflateFilterNote Output outstream
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DeflateFilterNote Ratio ratio
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LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate
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CustomLog logs/deflate_log deflate</pre>
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</dd>
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</dl>
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</blockquote>
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</div>
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</div>
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<div class="hr" id="deflatememlevel"><a name="deflatememlevel"><!-- --></a><h2 class="topictitle2">DeflateMemLevel</h2>
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<div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><tbody><tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Module">Module</a></strong>: mod_deflate</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Syntax">Syntax</a></strong>: DeflateMemLevel <em>value</em></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Default">Default</a></strong>: DeflateMemLevel 9</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Context">Context</a></strong>: <span id="deflatememlevel__deflatememlevel_context"><a name="deflatememlevel__deflatememlevel_context"><!-- --></a>server
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config, virtual host</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Override">Override</a></strong>: none</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Origin">Origin</a></strong>: <span id="deflatememlevel__deflatememlevel_origin"><a name="deflatememlevel__deflatememlevel_origin"><!-- --></a>Apache</span></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__UsageConsiderations">Usage Considerations</a></strong>: A LoadModule is required in
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the configuration file prior to using the directive. The statement should
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be as follows: deflate_module /QSYS.LIB/QHTTPSVR.LIB/QZSRCORE.SRVPGM</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateMemLevel 8</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>The DeflateMemLevel directive specifies how much memory should be used
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for zlib for compression.</p>
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<blockquote><dl class="dlexpand"><dt class="dltermexpand"><strong>Parameter</strong>: <em>value</em></dt>
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<dd><ul><li>The <em>value</em> parameter value specifies how much memory should be used
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for zlib compression. Each value is equal to 16K. For example, a value of
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1 equates to 16K, while a value of 8 equates to 128K.</li>
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</ul>
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</dd>
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</dl>
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</blockquote>
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</div>
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</div>
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<div class="hr" id="deflatewindowsize"><a name="deflatewindowsize"><!-- --></a><h2 class="topictitle2">DeflateWindowSize</h2>
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<div>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="void" border="0" rules="none"><tbody><tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Module">Module</a></strong>: mod_deflate</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Syntax">Syntax</a></strong>: DeflateWindowSize <em>value</em></td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Default">Default</a></strong>: DeflateWindowSize 15</td>
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</tr>
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Context">Context</a></strong>: <span id="deflatewindowsize__deflatewindowsize_context"><a name="deflatewindowsize__deflatewindowsize_context"><!-- --></a>server
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config, virtual host</span></td>
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||
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</tr>
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||
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<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Override">Override</a></strong>: none</td>
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||
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</tr>
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||
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|
<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Origin">Origin</a></strong>: <span id="deflatewindowsize__deflatewindowsize_origin"><a name="deflatewindowsize__deflatewindowsize_origin"><!-- --></a>Apache</span></td>
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||
|
|
</tr>
|
||
|
|
<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__UsageConsiderations">Usage Considerations</a></strong>: A LoadModule is required in
|
||
|
|
the configuration file prior to using the directive. The statement should
|
||
|
|
be as follows: deflate_module /QSYS.LIB/QHTTPSVR.LIB/QZSRCORE.SRVPGM</td>
|
||
|
|
</tr>
|
||
|
|
<tr><td colspan="2" valign="top"><strong><a href="rzaiedirective-dict.htm#rzaiedirective-dict__Example">Example</a></strong>: DeflateWindowSize 14</td>
|
||
|
|
</tr>
|
||
|
|
</tbody>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
|
|
<p>The DeflateWindowSize directive specifies the zlib compression window size.</p>
|
||
|
|
<blockquote><dl class="dlexpand"><dt class="dltermexpand"><strong>Parameter</strong>: <em>value</em></dt>
|
||
|
|
<dd><ul><li>The <em>value</em> parameter value specifies the level of compression window
|
||
|
|
size. The higher the value, the greater the compression window size.<div class="note"><span class="notetitle">Note:</span> Higher
|
||
|
|
compression levels require additional CPU time.</div>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
</blockquote>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|