QuickExec Reference

Fiddler's QuickExec box allows you to launch script-commands quickly. If you'd like, watch the demo video.

Keyboard Hints

Hit ALT+Q to quickly set focus to the QuickExec box. If Fiddler isn't active, hit CTRL+ALT+F first to activate Fiddler.
In the QuickExec box, hit CTRL+I to insert the URL of the currently selected session in the session list.
There's a hotkey for virtually everything in Fiddler. See the Keyboard Reference.

Default commands

The QuickExec commands listed below are available in the latest available Beta version of Fiddler.

Important Note: Because many commands are stored in your CustomRules.js file, you may not have the latest commands if you upgraded from an earlier version of Fiddler. To get the latest commands, either delete your CustomRules.js file, or copy the ExecAction function from SampleRules.js into your CustomRules.js.

Command	Action	Sample usage
?sometext	As you type sometext, Fiddler will highlight sessions where the URL contains sometext. Hit Enter to set focus to the selected matches.	?searchtext
>size	Select sessions where response size is greater than size bytes.	>40000 <-- Select responses over 40kb
<size	Select sessions where response size is less than size bytes.	<5k <-- Select responses under 5kb
=status =method	Select sessions where response status = status or request method = method.	=301 <-- Select 301 redirect responses =POST <-- Select POST requests
@host	Select sessions where the request host contains host. Hit Enter to set focus to the selected matches.	@msn.com <-- Select www.msn.com, login.msn.com, etc
bold	Mark any future sessions in bold if the url contains the target string	bold /bar.aspx bold <-- Call with no parameter to clear
bpafter	Break any response where the RequestURI contains the specified string	bpafter /favicon.ico bpafter <-- Call with no parameter to clear
bps	Break any response where the status code matches	bps 404 bps <-- Call with no parameter to clear
bpv or bpm	Create a request breakpoint for the specified HTTP method. Setting this command will clear any previous value for the command; calling it with no parameter will disable the breakpoint.	bpv POST bpv <-- Call with no parameter to clear
bpu	Create a request breakpoint for URIs containing the specified string. Setting this command will clear any previous value for the command; calling it with no parameter will disable the breakpoint.	bpu /myservice.asmx bpu <-- Call with no parameter to clear
cls or clear	clear the session list	cls
dump	dump all sessions to a zip archive in C:\	dump
g or go	Resume all breakpointed sessions	g
help	show this page	help
hide	Hide Fiddler in System tray	hide
urlreplace	Replace any string in URLs with a different string. Setting this command will clear any previous value for the command; calling it with no parameter will cancel the replacement.	urlreplace SeekStr ReplaceWithStr urlreplace <-- Call with no parameters to clear
start	Register as the system proxy	start
stop	Unregister as the system proxy	stop
show	Restore Fiddler from system tray -- more useful when triggering rules from ExecAction.exe (see below)	show
select MIME	Select any session where the response Content-Type header contains the specified string.	select image select css select htm
select HeaderOrFlag PartialValue	Select any session where the named Header or SessionFlag contains the specified string.	select ui-comments slow select ui-bold * <-- unless preceded by a slash, * means any value select ui-comments \* <-- Find comments with a * select @Request.Accept html <-- Find requests with Accept: html select @Response.Set-Cookie domain <- Find responses that Set-Cookie on a domain
allbut or keeponly	Hide all sessions except those where Content-Type header contains the specified string.	allbut xml allbut java
quit	Shutdown Fiddler.	quit
!dns hostname	Perform a DNS lookup of the target host and show the results on the LOG tab	!dns www.example.com !nslookup www.example.com
!listen PORT [CERTHOSTNAME]	Set up an additional listener on another port, optionally secured by a HTTPS certificate	!listen 8889 !listen 4443 localhost !listen 444 secure.example.com

Writing your own commands

You can easily add new commands by editing your FiddlerScript. Click Rules | Customize Rules. Scroll down to the OnExecAction function and simply add your own commands.

If you're developing a FiddlerExtension, you can implement the IHandleExecAction interface and handle the OnQuickExec event and respond accordingly.

Using ExecAction.exe

ExecAction.exe is a command line executable which is suitable for calling from batch files or unit tests. It passes its command line into FiddlerScript's OnExecAction function for processing, just like Fiddler's QuickExec box. The ExecAction commands can be handled by FiddlerScript or FiddlerExtensions.

ExecAction.exe is installed into the Fiddler directory inside your Program Files folder.

Usage:
ExecAction SCRIPTPARAMETER
ExecAction "PARAM1 PARAM2"

ExecAction sets %ERRORLEVEL% to

0 if successful
1 if an incorrect (!= 1) number of arguments used
2 if the Fiddler window could not be found.