Fiddler Limitations and Bugs
  • Fiddler does not support HTTP Pipelining at this time.
  • Fiddler's HTTPS decryption feature does not work well with authenticating proxy servers upstream.
  • Fiddler "eats" HTTP/1xx messages from the stream. (In practice, I have yet to find any client or scenario where that matters).
  • Fiddler's buffering mode is not compatible with COMET-style applications. You must Enable Streaming mode for such responses to be sent to the client.
  • Display of HTTP requests/responses is incomplete in some inspectors if a binary null appears in the content
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