List All Pages
Fiddler 2.2.6.0+ is compiled with a target of AnyCPU, meaning that it will run as a 64bit process in 64bit Windows, and as a 32bit process in 32bit Windows. You can easily tell what bitness...
Fiddler supports a variety of command line arguments that control various options:
Start Fiddler listening on port #1234
fiddler.exe /port:1234
Start Fiddler without addons
fiddler.exe...
Fiddler feedback options are listed here.
In Fiddler 2.2.6.5 and later, users can control preferences using the QuickExec box below the session list.
You can view the current preference settings by typing:
prefs show
You can set a...
The following example demonstrates how to create and add a new tab to the Fiddler UI.
C#
using Fiddler;
[assembly: Fiddler.RequiredVersion("2.2.2.0")] //Necessary for Fiddler to load the...
If someone knows how to debug CSS with Fiddler, it would be a GREAT tutorial!
Thanks
Start Fiddler
Clear the browser cache
Hit CTRL+F5 to reload the page
In Fiddler, click the Protocol column to sort by requests by protocol
Determine which URLs have been delivered using...
For now, start here
If you're trying to decide whether to build a Fiddler Extension or an application hosting FiddlerCore, see FiddlerCore documentation
In Fiddler 2.2.6.5 and later, you can force Fiddler to issue all requests from a particular network interface (rather than the default). To do so, you need to set a new preference in Fiddler with...
The following example demonstrates how to add a custom ExecAction handler with .NET.
This example adds a new ExecAction command "clearcache" which will use Fiddler's built in cache clearing...
Place feature requests here. Please describe how you would want the feature to work, and how valuable it would be to you.
FiddlerCap is a lightweight version of Fiddler designed solely for data-capture by non-technical users. FiddlerCap generates SAZ files which can be sent to experts for analysis.
See...
Shared Proxy Configuration
Fiddler can act as a shared proxy server running on one PC, with one or more external PCs or devices connected.
Reverse Proxy Configuration
Fiddler can be configured to...
FiddlerCore is currently provided as a .NET class library that can be consumed by any .NET application. FiddlerCore is designed for use in special-purpose applications that run with either no...
FiddlerCore API
Programming against the FiddlerCore API is pretty simple. First, attach event handlers to the Fiddler.FiddlerApplication object to receive notification of HTTP(S) requests and...
using System;
namespace Demo
{
class Program
{
static void Main(string[] args)
{
#region AttachEventListeners
//
// It is important...
Here's another sample application for FiddlerCore:
using System;
using Fiddler;
using System.Collections.Generic;
using System.Threading;
namespace Demo
{
class Program
{...
Unlike Fiddler, FiddlerCore does not keep a session list automatically. If you want a session list, simply create an List<Fiddler.Session> and add new sessions to it as they’re received....
Fiddler does not support HTTP Pipelining at this time.
Fiddler's HTTPS decryption feature does not work well with authenticating proxy servers upstream.
Fiddler "eats" HTTP/1xx messages from the...
Cookie analyzer
Look for invalid "domain" or path attribute
Look for P3P policy errors or "unacceptable" tokens
HTTPLint
Warn on NTLM/Nego usage with Connection: Close
Warn on NTLM/Nego...
! Note: Fiddler registry settings are subject to change at any time, and should generally be set using only the Fiddler user-interface. In particular, the settings should not be set, or directly...
If you double-click the vertical blue line separating the Web Sessions list from the tabs, the Web Sessions list “fully” expands to show all columns.
You can Add new columns to the Web...
Welcome to the Fiddler Wiki.
Thanks for your help in contributing to the Fiddler community.
Using Fiddler
Fiddler Configurations
Fiddler "How-To" Tutorials
Fiddler UI Tips and Tricks
Developer...
This page will contain "How-To" information for Fiddler. It should link to new pages explaining, step-by-step, how to use Fiddler to accomplish certain goals.
User How-To
Debug HTTPS Mixed Content...
If you are allowed to edit pages in this Site, simply click on edit button at the bottom of the page. This will open an editor.
To create a link to a new page, use syntax: [[[new page name]]] or...
Who can join?
Anyone!
Join!
Or, if you already know a "secret password", go for it!
Create column showing savings if GZIP used
public static BindUIColumn("GZIP Savings", 60)
function FillSizeColumn(oS: Session){
if (!oS.bHasResponse) return String.Empty;...
Fiddler 2.2.8 introduced a lightweight Logging mechanism.
From FiddlerScript, you can do this:
FiddlerObject.log("Your message here");
From a Fiddler extension, do...
For now, this page can be used for random information until a more formal structure to the pages is established. The info will at least be "ready" here to be used on another page
(The following is...
Shows verbose error messages when Inspector and Extension related errors are encountered.
fiddler.debug.extensions.showerrors
Controls whether the Fiddler Toolbar is...
Fiddler 2.3 will include a new preferences management system which is accessible to script and extensions. The system will be somewhat similar to the preferences system within Firefox (e.g. type...
While Fiddler isn't designed for use in a service, it is possible, and enables a few interesting scenarios.
For example it can launch on system startup, and removes the need for a user to be logged...
Background
Session Archive Zip (SAZ) files are used to store HTTP(S) traffic for later examination.
Saving SAZ files
Fiddler users may save .SAZ files using the File > Save menu options.
To...
WikiHome
How to edit pages?
Join this site...
Site members
Recent changes
List all pages
Page Tags
Site Manager
TagCloud
Add a new page
edit this panel
Members:
Moderators
Admins
// -- Stress Test Compression/Decompression -----------
oSession.utilDecodeResponse();
oSession["ui-Comments"] =...
Fiddler
Recompile for X64 and test improvement in response size/quantity
Figure out how to get more responsive UI on Vista+
Build FiddlerScript# addon
Rewrite connection reuse with Select()
Finish...
Fiddler Sites
Fiddler Homepage
Discussion forum
Blog
contact
