How to debug the http response headers from a HTTP call

I've开发者_运维技巧 installed FireBug, but I am not sure how to find out if a certain http header is present in my HTTP response. Where should I look for this information?

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Use the Net tab in Firebug to monitor network traffic. There you can see the complete headers as well as the timing and content of any network/HTTP queries.

Looks like this:

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Fiddler is the best tool I know of to do this and much more, including inspecting the entire request/response in many formats including a nice XML browser.

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Fiddler in good but sometimes it causes problems because of changing the system proxy configuration.

Check the HTTP Debugger, it's not a proxy and doesn't create such problems https://www.httpdebugger.com