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This article was previously published under Q234497
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Microsoft Internet Information Services (IIS) versions 5.0 and later support HTTP compression as defined in the HTTP specification. By default, HTTP compression only compresses files with a file name extension of "htm," "html," and "txt." This article explains how to specify additional document types for compression.
Note The first Microsoft Exchange Server version that natively supports HTTP compression is Exchange Server 2003. For additional information how to enable HTTP compression in Exchange Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/830827/ )How to manage Outlook Web Access features in Exchange Server 2003
NOTE: The commands in step 3 replace the previously defined file extensions. It does not append them to the existing file extensions.
For more information about compression formats, visit the following Web sites:
RFC 1945 (Hypertext Transfer Protocol -- HTTP/1.0)
RFC 1951 (DEFLATE Compressed Data Format Specification version 1.3)
RFC 1952 (GZIP file format specification version 4.3)
RFC 2616 (Hypertext Transfer Protocol -- HTTP/1.1)
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