How to debug the http response headers from a HTTP call

Question

I\'ve 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?

Answer 1

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