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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Fiddler Classic has been superseded by the commercial non-free software Fiddler-Everywhere.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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Use Fiddler on localhost only

Is there a way to set Fiddler software to log only "localhost" and not all the web traffic ? Thanks,
TheBoubou
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How do I use Fiddler to modify the status code in an HTTP response?

I need to test some client application code I've written to test its' handling of various status codes returned in an HTTP response from a web server. I have Fiddler 2 (Web Debugging Proxy) installed and I believe there's a way to modify responses…
w5m
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Using Fiddler to sniff Visual Studio 2013 requests (proxy firewall)

I am having issues with Visual Studio 2013 and our corporate proxy (signin does not work, updates do not work, visual studio gallery does not work, nuget and git fail ). All of these are doing http or https requests. (e.g.…
Dr.YSG
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Request headers bag is missing Authorization header in Symfony 2?

I'm trying to implement a custom authentication provider in Symfony 2. I'm sending a test request using Fiddler and printing all headers server side; well, Authorization header is missing. Am i doing something wrong? GET…
user1098965
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ASP.NET MVC 4 Web API Authentication with Membership Provider

I have an ASP.NET MVC 4 Project using the Web API. On the controller I have set the class to require authorization using the [Authorize] attribute. For Authentication I am using the ASP.NET Membership Provider and have my Web.Config set to use…
INNVTV
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Fiddler 4.6 cannot connect to strong SSL?

Error: [Fiddler] The connection to '.com' failed. System.Security.SecurityException Failed to negotiate HTTPS connection with server.fiddler.network.https> HTTPS handshake to .com (for #3) failed. System.IO.IOException Unable to…
Jonesome Reinstate Monica
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How to display the request sent time and the response received time in Fiddler?

I'm working with Fiddler Web Debugger tool version 4.4.4.8. I've made a request to e.g. www.google.com and fiddler shows that a request is sent and the response is received. How could I know about and display when the request was sent and when the…
The Light
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How to use Fiddler to debug traffic from Any app (eg. C#/WPF app)

I am tring to debug whats wrong with my HTTP requests from another question here on SO. So i read a bit about Fiddler and wanted to use it to debug my problem. But I can't seem to get traffic from my WPF application to go through Fiddler. I believe…
Jiew Meng
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SoapUI with Fiddler

I am trying to route my soapUI web service requests via fiddler, but it doesn't seems to work. I tried url's like http://localhost./myservice/myservice.asmx http://localhost:8888/myservice/myservice.asmx The later one though goes via fiddler, but…
Ashish
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Fiddler not sniffing SOAP traffic from ASP.NET website

So far I've been successfully using fiddler to sniff web service traffic from both test fixtures, console apps and web projects. Today I noticed I am not able anymore to sniff that kind of traffic if I am running my web application (it's a ASP.NET…
JohnIdol
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Simulate network speeds using Fiddler

I am using Fiddler and want to simulate different network speeds Is there any published data that I can use to simulate different speeds using the delay value ? Following is default code of Fiddler to simulate 56kb modem speed. if (m_SimulateModem)…
aneez
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Get HTTP requests and responses made using HttpWebRequest/HttpWebResponse to show in Fiddler

Is there any way I can hook Fiddler up to capture requests and responses made using .NET HttpWebRequest and HttpWebResponse?
Fung
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WCF - Inspect the messages being sent/received?

I have 2 solutions: - Server Solution - Client Solution The server registers itself to my localhost IIS: http://localhost/MyApp/ The client adds WCF Services (Service References) from the localhost application:…
michael
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Using Fiddler with IIS7 Express

I am using IIS7 Express while developing my web application. I need to use fiddler to investigate an issue and cannot figure out how to configure things so I can get the HTTP stream. It seems that IIS7 express will only listen on localhost which…
Brettski
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Why make use of HTTPS when Fiddler can decrypt it

I have just discovered that Fiddler can decrypt HTTPS traffic. For instance, I deployed a website on localhost using HTTPS. When inspecting the data packets in Fiddler, I was able to view all the information since it has an option to decrypt it. My…
Joe Borg
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