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How do I display localhost traffic in Fiddler while debugging an ASP.NET application?
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To get Fiddler to capture traffic when you are debugging on local host, after you hit F5 to begin degugging change the address so that localhost has a "." after it. Hit enter and Fidder will start picking up your traffic. Save this answer. Show activity on this post.
Fiddler and FiddlerCore only handle HTTP/HTTPS traffic. They are not designed to handle raw TCP traffic; you could use something like netcat for that.
Setting up Fiddler for capturing requests Remove all sessions (select all items in the list, press the Delete key) Configure Fiddler to capture HTTPS traffic from the Tools | Fiddler Options... menu. Open the HTTPS tab and check Decrypt HTTPS traffic.
try using this:
http://ipv4.fiddler/folder instead of
http://localhost/folder this also works with ports
http://ipv4.fiddler:12345/folder Here is link to fiddler documentation
http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/MonitorLocalTraffic
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To make Fiddler work on localhost with IIS Express you should use this form of URL
http://localhost.fiddler:50262/ This puts correct Host header value (localhost) which satisfies IIS Express.
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