Fiddler Web Debugger

Fiddler is a web debugging tool which is owned, developed, and distributed by Eric Lawrence.

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  • Blog Post: Find Proxy Authentication bugs with Fiddler

    Over on my other blog, I just posted an article showing how you can use Fiddler to find bugs in applications that don't expect authenticating proxies.
  • Blog Post: Fiddler and Channel Binding Tokens Revisited

    Just under a year ago, I wrote a blog post about how the new “Extended Protection” feature (also known as Channel Binding Tokens or CBT) prevented seamless decryption of certain authenticated HTTPS traffic when Fiddler is running. The quick recap is that CBT binds a set of NTLM or Kerberos...
  • Blog Post: Fiddler and Channel-Binding-Tokens

    Note: Please see this post for an update. Some users of Fiddler who have HTTPS Decryption enabled have found that some of their internal HTTPS sites that used to work properly with Fiddler now endlessly prompt for credentials while Fiddler is running. Even typing the correct credentials into the authentication...
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