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Questions tagged [fiddler]

Fiddler (aka "Fiddler classic") is a free .net based web debugging proxy for Windows, which allows you to log, examine, modify and replay HTTP/HTTPS traffic from your computer.

The tool shows an overview of HTTP(S) requests and details about the selected request(s) - see the screenshot below.

It allows you to inspect both the request and response, filter data that are (un)interesting, as well as modify (by script or manually) and/or replay chosen requests. The request/response list can be also saved and loaded.

Fiddler Classic has been superseded by the commercial non-free software Fiddler-Everywhere.

Fiddler is also available as a .NET library, FiddlerCore, and as a capture-only FiddlerCap tool (useful, for example, for collecting debug traffic data from customers).

Fiddler Classic is a free-to-use tool; requires MS Windows XP or later and Microsoft .NET Framework v4.0 or later. Download page here

Screenshot

enter image description here

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Send POST request to asp.net mvc action via Fiddler

I have an ASP.NET MVC web site. One of my routes is a URL that takes 5 parameters. For the sake of illustration, these parameters are named parameter1, parameter2, parameter3, parameter4, and parameter5. Currently, I'm constructing a URL in some C#…
Eels Fan
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HttpWebRequest doesn't work except when fiddler is running

This is probably the weirdest problem I have run into. I have a piece of code to submit POST to a url. The code doesn't work neither throws any exceptions when fiddler isn't running, However, when fiddler is running, the code posts the data…
dlock
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Using fiddler with Windows Authentication

I am testing some proxy settings for our application but I need to test a proxy that requires Windows Authentication (or network credentials). For testing, I assigned the credential of the proxy to the network credentials System.Net.WebProxy proxy =…
Pierre-Alain Vigeant
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Windows Phone 8.1 Emulator not proxying through Fiddler

I've just started looking into Win Phone 8.1 and playing with proxying some data via Fiddler from the emulator but it doesn't seem to want to play ball. All the guidance around Phone 7 and 8 (not 8.1) seems to be that the emulator will route traffic…
Troy Hunt
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What is the best way to block specific URL for testing?

I am observing a website with Google Chrome and Fiddler version 4.4. The page is using AJAX to update its data. I want to block a specific URL to test what will happen if it doesn't work. What is the easiest way to block the URL?
babakgh
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Browser caching - Why does IE9 always show http 304 when actually it did not hit the network?

I am trying to set up caching correctly and have set Expires headers to 365 days in the future which is working correctly but not showing correctly in IE9. Does anyone know why? When you visit any website in IE9 (eg www.google.com) then click Enter…
mike nelson
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Are there any http proxies like fiddler or wireshark on android?

I need to see what page an Android App is calling from my device. Are there any Apps like Fiddler or Wireshark to see what´s happening behind?
rizidoro
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How to capture http messages from Request Node library with Fiddler

Regular client initiated requests to the node server are captured fine in Fiddler. However, requests sent from node to a web service are not captured. It did not help to pass in config for proxy (127.0.0.1:8888) to the request method. How can I…
mupersan82
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How to put the fiddler composer window back after tear off?

The "options" sub-tab of the fiddler "Composer" tab lets you tear off the Composer into a floating window. Question is how to put it back? I lost the floating window and now fiddler's composer is gone. I didn't find anything in the menus to…
Reb.Cabin
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Is there a way to configure Fiddler to intercept HTTP calls from a Windows service?

We're in the process of replacing an old (5+ years) Windows service application built with VS2005 that makes an HTTP GET call. There are several things that make this difficult (such as the web server is on the customer's network and we can't…
Mike Chess
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How can I monitor HTTP traffic from BlueStacks?

I want monitor HTTP traffic from BlueStacks so that I can debug web analytics tracking - any idea how? For example, my application calles my server. I want to know what actual API my application actually called during testing. I do not see any HTTP…
user4951
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Fiddler Not Capturing Traffic from my C# Application

I am having problems capturing traffic sent and received from my C# application. The application is an ordinary WinForms application using C# 5.0 and .NET 4.5. . Fiddler captures traffic from Chrome and Firefox with no issues, just not my…
James Jeffery
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HTTPS->HTTP via Fiddler

I'm looking for a way to use Fiddler to proxy an HTTPS session into an HTTP session, so the explorer will use an HTTP session while the Fiddler handles the HTTPS session in front of the server: Client (explorer) <--http--> Fiddler <--https-->…
Yohay Etsion
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OWIN OpenIdConnect Middleware IDX10311 nonce cannot be validated

I have an application using the OWIN middleware for OpenIdConnect. The startup.cs file uses the standard implementation of app.UseOpenIdConnectAuthentication. The cookie is set to the browser, but it errors with: IDX10311: RequireNonce is 'true'…
gilm0079
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Fiddler not displaying sessions

I've got the latest version of fiddler installed on 2 machines (v2.3.0), and on one machine it displays web sessions, and in the other it doesn't. This is using IE and Firefox on Win7. I have tried deleting my customrules.js and letting fiddler…
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