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Live HTTP Headers
A Firefox add-on that allows you to see HTTP headers....
Live HTTP Headers for SeaMonkey
A SeaMonkey add-on that helps you view the HTTP headers of a page even when you are browsing...
View Headers Toggle Button for ThunderBird
View Headers Toggle Button for ThunderBird - ThunderBird add-on that places a button on the toolbar to easily toggle viewing....
HTTP View Source
Free and open source webpage info viewer...
Modify Headers
A Firefox add-on that allows you to modify HTTP request header...
Show Page Headers
Display the HTTP headers of the currently open page in a new tab or window...
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Objective-C++ Preprocessor Headers
Standalone header files that can be included in any project to extend Objective-C's syntax...
Modify Headers for SeaMonkey
A SeaMonkey add-on that adds, modifies and filters HTTP request headers...
Headers Toggle for ThunderBird
A ThunderBird add-on that adds a keyboard shortcut to toggle between different header display...
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Toggle Compose Headers for Thunderbird
A ThunderBird add-on that allows you to hide or, on the contrary, to "unhide" headers in compose window...
Http FX
A HTTP request mockup tool developed in Java...
HTTP Analyzer
Easily test HTTP servers and web applications...
HTTP Logout
A Firefox add-on that lets you quickly logout from a HTTP session...
Right HTTP Connection
Free and robust HTTP/S connection module...
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Http Get/Post
An easy to use HTTP/CGI GET/POST java class library....
HTTP Test
Make HTTP connections to a server and analyze the response...