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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Fiddler Classic has been superseded by the commercial non-free software Fiddler-Everywhere.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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Capturing HTTP/S traffic for an application that uses libcurl

I have a UWP application that uses libcurl to make HTTPS calls to my server, I'm trying to view the traffic using fiddler. What I've tried: Defining fiddler as a reverse proxy and I can at least see traffic from Firefox. Setting the…
Darius
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fiddler 4 doesn't start up at all, without out an error code

Fiddler 4 is not opening up. I tried opening it, running it as an administrator and troubleshooting. I installed it last week, and nothing was wrong then. I could use it until yesterday, when it wouldn't even start up. I didn't have any errors…
LumÎnix Dr. Supreme
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using FiddlerCore as view-only

I'm using fiddlerCore in order to capture the network activity. I downloaded the "fiddlercore demo 1" from the fiddler wiki page (http://fiddler.wikidot.com/fiddlercore-demo) and I removed the Fiddler.CONFIG.IgnoreServerCertErrors = false;…
Tal Yaari
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How to traversal a array in JSON Response in Fiddler CustomRules.js?

In CustomRules.js static function OnBeforeResponse(oSession: Session) { var responseStringOriginal = oSession.GetResponseBodyAsString(); var responseJSON = Fiddler.WebFormats.JSON.JsonDecode(responseStringOriginal); var…
Hexor
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Send Headername and Headerkey Trougth Browser

I have added security to one of my services, and I would like to test it, Is there some way of adding the Key and Name in the Header? How can I do that in Fiddler, What do I have to type?
Pirette
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Looking for a firefox plugin that will list the input fields by name

I am looking for a firefox plugin that will look at a page and list the forms and the inputs (hidden, text, radiobuttons, checkboxes, etc) that will be submitted with a form submission. I would like to view these by name. I am doing ASP MVC…
MedicineMan
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Keyboard Shortcut for Editing FiddlerScript?

I want to get to the FiddlerScript editor without using the mouse but I don't see a shortcut for this in https://docs.telerik.com/fiddler/KnowledgeBase/Keyboard.
Elliott Beach
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Microsoft Edge won't open the web site until opens the Fiddler

When I put the website url in the Microsoft Edge browser address bar, and press "Enter", nothing happened, the webpage does not show. Open the developers tool menu by pressing F12, go to the "Network" tab, there is no content at all. Note: I have…
Sharon Ma
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Debugging using SOAP UI

I am facing a strange problem. I have a mvc web application developed and running on my local machine and can connect to an API https://api-uat1.%domain%.com:443 from the [api_root] configured as an app setting in the web config. But this is on my…
user3276487
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Service calls from Intellij are not routed through Fiddler

I'm going crazy here. I have a local project setup in intellij that makes many different service calls. All I'm trying to do is route those service calls through Fiddler so that I can see headers/bodies for requests/responses easily. I've read…
moondc
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Android 9 (Pie) - Not able to capture any api (native / web) through network monitoring tools such Charles proxy and Fiddler

I am trying to capture apis triggered from native app and website through Charles proxy / Fiddler , But I am not able to see any api there. I have set manual proxy as well. I am able to see apis for Android 8 and below . But not working for Android…
Srinivasan G
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Getting Fiddler to capture remote traffic

On my webserver I have an web app installed and I want to monitor traffic to/from that app. Hence I installed Fiddler. When I browse to that app from the webserver/through localhost the traffic is captured however when I browse to the web app from a…
Peter Chikov
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UWP application only connects to Sharepoint when Loopback exempt AND fiddler is running at the same time

I have a UWP application that is to connect to sharepoint 2013. Initially the app did not connect at all and I narrowed down the error to a loopback issue. I ran the CMD checknetisolation loopbackexempt -a -n= to exempt my app from the loopback,…
pardon_garden
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AspNetCore Antiforgery and Fiddler

Which anti-forgery keys is required to make post calls with programs like Postman or Fiddler? It seems like I have both a cookie and also a hidden form-data variable. Which should I use, and how do the anti-forgery checks work? I am using a simple…
Olof84
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While sending data in JSON, the date changes to previous day

Saving the data in one function call, where I am sending the data as 2019-02-01T00:00:00.000Z but the fiddler shows the different date in JSON as 2019-01-31T18:30:00.000Z. I am not aware that why it is giving the difference of 5 hrs 30 minutes. On…
Fenil shah
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