DOCUMENT:Q255951 04-AUG-2000 [iis] TITLE :HTTP Compression Methods and Files Used by IIS 5.0 PRODUCT :Internet Information Server PROD/VER:winnt:5.0 OPER/SYS: KEYWORDS:kbOSWin2000 ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Services version 5.0 ------------------------------------------------------------------------------- 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. MORE INFORMATION ================ 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 : kbOSWin2000 Technology : kbiisSearch kbiis500 Version : winnt:5.0 Issue type : kbinfo ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.