How Can I Determine if HTTP Requests/Responses are compressed in IE7?

Posted by DTS on Stack Overflow See other posts from Stack Overflow or by DTS
Published on 2010-03-16T19:34:30Z Indexed on 2010/03/18 22:31 UTC
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fiddler

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ie7

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http-header-fields

I'm trying to use Fiddler (v2.2.2.0) to see if HTTP traffic through IE7 is being compressed. I'm not seeing Accept-Encoding or Content-Encoding request/response headers being sent/returned and I do not need to decode the response data once it's arrived, which leads me to believe that the responses are NOT coming back compressed.

However, when making the same requests using FireFox 3.5.7, I could see through FireBug that FF was sending Accept-Encoding and YSlow at least thought my data was coming back compressed.

A comment in this question:

http://stackoverflow.com/questions/897989/using-fiddler-to-check-iis-compression

suggested that a proxy server may be to blame for stripping out headers and decompressing the content for security reasons. I am using Verizon FIOS for my broadband at home and am now wondering if Verizon is proxying my HTTP traffic?

In short, how can I positively confirm/deny that responses are coming back compressed through IE?

Thanks.

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