RegExp pattern used to match HTTP mime-types that can be compressed by GZip encoding.
-If set to "true" (the default value), the pattern "text/.*" will be used.
-If set to "false", the compression will be disabled.
Should be set to "false" or "text/html" if IE6 is used on Windows older then Windows XP SP2.
The pattern must match entire value of mime-type - examples of valid patterns are:
"text/html", "text/.*", "text/.*|application/rtf|application/rss\+xml"
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