How do I get Fiddler to stop ignoring traffic to localhost?

When using Fiddler to monitor HTTP Requests & Responses in Internet Explorer it ignores all traffic directed to http://localhost.

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.

For instance, you start debugging and the you have the following URL in the Address bar:

http://localhost:49573/Default.aspx

Change it to:

http://localhost.:49573/Default.aspx

Hit enter and Fidder will start picking up your traffic.

Fiddler's website addresses this question directly.

There are several suggested workarounds, but the most straightforward is simply to use the machine name rather than "localhost" or "127.0.0.1":

http://machinename/mytestpage.aspx

The correct answer is that it's not that Fiddler ignores traffic targeted at Localhost, but rather that most applications are hardcoded to bypass proxies (of which Fiddler is one) for requests targeted to localhost.

Hence, the various workarounds available: http://fiddler2.com/documentation/Configure-Fiddler/Tasks/MonitorLocalTraffic

Fiddler v4.5.1.0 will allow you to go to replace "localhost" with "localhost.fiddler", and present localhost as the host name for the receiving server running on your machine.

This avoids "host not recognised" errors when connecting to WCF services with the built in web server that visual studio uses.

i.e. Instead of http://localhost:51900/service.wcf you can use http://localhost.fiddler:51900/service.wcf

Internet Explorer has a new feature since IE9 RC: adding <-loopback> to the proxy bypass list causes WinInet (the network library used by IE) to send requests destined for localhost and 127.0.0.1 through the defined proxy.

Here's the original announcement by @EricLaw: http://blogs.msdn.com/b/fiddler/archive/2011/02/10/fiddler-is-better-with-internet-explorer-9.aspx

For Fiddler to capture traffic from localhost on local IIS, there are 3 steps (It worked on my computer):

1. Click Tools > Fiddler Options. Ensure Allow remote clients to connect is checked. Close Fiddler.

2. Create a new DWORD named ReverseProxyForPort inside KEY_CURRENT_USER\SOFTWARE\Microsoft\Fiddler2. Set the DWORD to port 80 (choose decimal here). Restart Fiddler.

3. Add port 8888 to the addresses defined in your client. For example localhost:8888/MyService/WebAPI/v1/

Using Fiddler v4.6 and the default configuration could not see any traffic from 'localhost'. Tried many suggestions here but nothing worked.

Enabled Help -> Troubleshot and could see many more requests. Sessions were marked in a strike-through font and reason given was 'Hidden due to Status Bar> Process Filter.'

Found this reply from Eric Lawrence to person having same problem http://www.telerik.com/forums/fiddler-not-capturing-ios-traffic-even-though-echo-service-works

basically what to do is: Look at the Status Bar across the bottom of the Fiddler window, the second little "tray" in that bar probably says something like "Web Browsers." Click that and then change to "All Processes."

You can use http://ipv4.fiddler or http://ipv6.fiddler instead of localhost

Don't use localhost in the url!

• http://localhost:4200/myTestProject

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Use like this:

• http://MyMachineName:4200/myTestProject
• http://ipv4.fiddler:4200/myTestProject

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=>=> Click here for further information <=<=

make sure Monitor all connections is ticked. it does not work for me maybe port is diffren i need yo see httprequest to my site from gmail my site is on win xp and iis5(my own machine)

Use your local IP address (not 127.0.0.1) instead would work, such as 192.16.0.88 etc. Go to cmd.exe and type ipconfig and you will see it.

Windows XP:

Be sure to set to click the settings button for each of the items in the "Dial-up and Virtual Private Network settings" listbox in the "Connections" tab of the "Internet Options" control panel applet.

I noticed that Fiddler would stop using the "LAN settings" configuration once I connected to my VPN. Even if the traffic wasn't going through the VPN.

• Type ipconfig at the commmand prompt.
• It will give you your IPv4 Address
• Replace localhost with your IPv4 Address in the Url when hitting the service.

The traffic will show up in Fiddler under your computer's IP address.

Unfortunately none of the suggestions were helpful

Only complete exclusion of localhost from monitoring with following setting:

Open View Menu
  > Preferences
    > Connections
      > Bypass Fiddler for URLs that start with:
        > localhost;127.0.0.1

Go to Tools, Fiddler Options ..., select the Connections tab, then make sure Monitor all connections is ticked. Like Antony Scott said, but also make sure that the "Web Sessions" pane is set to "Capturing" and [ "Web Browsers" OR "All Processes" ]. Looks like the default is "Non-Browser".