How do I remove eTag headers from IIS7?

asp.net iis-7 etag
Brent Broome picture Brent Broome · Jan 25, 2009 · Viewed 40.3k times · Source

Per Yahoo's best practices for high performance web sites, I'd like to remove Etags from my headers (I'm manually managing all my caching and have no need for Etags... and when/if I need to scale to a farm, I'd really like them gone). I'm running IIS7 on Windows Server 2008. Anyone know how I can do this?

Answer

AnthonyWJones picture AnthonyWJones · Jan 25, 2009

Under IIS7 the Etag change number (the part of the Etag following : ) is always set to 0.

Hence the Etag from the server no longer varies from server to server for the same file and therefore the Yahoo best practice no longer really applies.

Since you can't actually suppress the ETag header on IIS7 it would probably be best that you don't fiddle with it at all. I've found by far the most useful configuration rule is "If the default doesn't break something, leave it alone".

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