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HTTP Security Report : Get an instant report of how your website measures up to the best practices.
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REDbot : REDbot is lint for HTTP resources; it tests protocol correctness, cacheability, content negotiation and more. REDbot checks HTTP resources to see how ...
RequestBin : RequestBin gives you a URL that will collect requests made to it and let you inspect them in a human-friendly way.
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mail-tester.com : Free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems
Differentiate HTTP headers and content body of two GET URLs.
