Microsoft KB Archive/255951

= HTTP Compression Methods and Files Used by IIS 5.0 =

Article ID: 255951

Article Last Modified on 11/21/2006

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APPLIES TO


 * Microsoft Internet Information Services 5.0

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This article was previously published under Q255951



SUMMARY
By default, Internet Information Services (IIS) 5.0 uses the GZip and Deflate HTTP compression methods. Both compression methods are implemented through an ISAPI filter.



ISAPI Filter
HTTP compression is a subservice of IIS, which is handled through an ISAPI filter. Because this filter is installed at the WWW Service level, compression must be configured for the entire Web server. It cannot be configured for a specific Web site. The following two files handle this compression (located in the %WinDir%\System32\INETSERV folder):
 * CompFilt.dll
 * GZIP.dll

Compression Methods

 * GZIP file format specification - RFC 1952
 * DEFLATE Compressed Data Format Specification - RFC 1951

Note: To look up an RFC, see http://www.ietf.org

For more information on enabling HTTP compression, review the Internet Information Services documentation.

Additional query words: iis 5 akz

Keywords: kbinfo KB255951

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