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

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 th开发者_Python百科at 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:

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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Fiddler sees your request before any upstream proxy has the ability to mess with it. So, if you don't see an Accept-Encoding being sent from IE, there are three possibilities:

1. You have the Rules > Remove All Encodings option checked in Fiddler.

2. You have either of the "Use HTTP/1.1" checkboxes unchecked iside Tools > Internet Options > Advanced in IE.

3. You have a piece of security/privacy/filtering software or addons (e.g. Norton/SpyBot/etc) installed and have it intercepting and stripping compression from IE.