If a site uses, for example, a <script src=... then I want to catch that script and modify it.

I choose Unlock for editing and modify it, but I've noticed when I click Replay/Reissue the browser's console still shows only the original Response.

Meanwhile, Fiddler does show the new modified request being sent.

So what does it mean?

Hi,

I want to modify the response body value which is stream, but failed.

The stream value is just like MP4, the ascii of head data is "00 00 00 20 66 74 79 70 69 73 6F 6D...".

And I planed to modify them to "FE FE FE FE FE FE FE ....". But when I check the sent data, I found them were changed to "C3 BE C3 BE C3 BE C3 BE C3 BE C3 BE ..."

The following is my JScript code:

var oBody;
oBody = "\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe\xfe";
oSession.utilReplaceRegexInResponse("ftypisom.*",oBody);

// oSession.utilSetResponseBody(oBody);                    // I tried this but failed too...

How could I set response body to any ascii.

Thanks :)

Hi,

 

I tried to install Fiddler Everywhere on Raspbian Linux on a Raspberry. Is that possible? I saw that previous versions supported mono, but the AppImage-file seems to be a x86_64 binary. Can I install it with mono or is that not possible anymore?

 

Thanks,

Matthias

Hello,

I'm new to fiddler.

Is it possible to capture and save the videos or stream running on the browser?

How to achieve that if possible?

 

Thanks in advance.

 

According to Understanding FiddlerScript, if you don't define Rules=>Customize Rules, then Fiddler uses "the latest SampleRules.js file included in the Fiddler installation package".

But what if I want to add define just one specific rule and still always enjoy the latest SampleRules?

Is it possible to use customized rules in an opt-in fashion? That is, keeping customized rules almost empty and having all defaults automatically be loaded from SampleRules?

While Fiddler is running, Postman requests fail. As instructed by Postman I have to disable SSL certificate verification in Postman. Is this best practice, or is there some other way so Postman works normally with Fiddler?

Hi,  

 

New install of windows and just downloaded fiddler.  Got this error

 

---------------------------
Loading custom MIME mappings failed
---------------------------
Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.
The cloud file provider is not running.


Type: System.IO.IOException
Source: mscorlib
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)
   at System.Xml.XmlTextReaderImpl.InitStreamInput(Uri baseUri, String baseUriStr, Stream stream, Byte[] bytes, Int32 byteCount, Encoding encoding)
   at System.Xml.XmlTextReaderImpl..ctor(String url, Stream input, XmlNameTable nt)
   at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)
   at Fiddler.XmlFileMimeMappings..ctor(String filePath) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\MimeMapping\XmlFileMimeMappings.cs:line 40
   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 9784

Fiddler v5.0.20194.41348 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.17763.0]
---------------------------
OK  
---------------------------

 

Is it a bug?

Who is Jenkins? :)

 

Cheers

 

Andy

 

 

 

Running Fiddler v5.0.20194.41348 on Windows 7 and trying to debug a login process with AqBanking (part of gnucash). AqBanking is bypassing the Fiddler proxy. Actually quite a few applications are bypassing Fiddler. The Fiddler proxy is showing active any time capture is enabled (127.0.0.1:8888 active for HTTP and Secure). Other applications have no network config options, but they do use the Windows TCP/IP stack. Firefox, Chrome, and MSIE are all functioning with Fiddler 4 active.

How do I force ALL Windows network applications to work with Fiddler?

I'm using Fiddler in a dark theme. But there are a few colors I wasn't able to change.

 - Color of some blue entries (not sure what differentiates them)
 - Color of hex editor text in request
 - Color of hex editor text in response

Image attached. Please tell me how to customize these colors.

I've just updated the Fidder4 and got the error on start:

---------------------------
Awww, Fiddlesticks!
---------------------------
Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.



1) Unknown error (0x278)



Resulting in: An exception occurred while trying to create an instance of type 'Telerik.NetworkConnections.NetworkConnectionsManager'.



Resulting in: Cannot activate part 'Telerik.NetworkConnections.NetworkConnectionsManager'.

Element: Telerik.NetworkConnections.NetworkConnectionsManager -->  Telerik.NetworkConnections.NetworkConnectionsManager -->  DirectoryCatalog (Path="E:\Program Files\Fiddler\Fiddler")



Resulting in: Cannot get export 'Telerik.NetworkConnections.NetworkConnectionsManager (ContractName="Telerik.NetworkConnections.NetworkConnectionsManager")' from part 'Telerik.NetworkConnections.NetworkConnectionsManager'.

Element: Telerik.NetworkConnections.NetworkConnectionsManager (ContractName="Telerik.NetworkConnections.NetworkConnectionsManager") -->  Telerik.NetworkConnections.NetworkConnectionsManager -->  DirectoryCatalog (Path="E:\Program Files\Fiddler\Fiddler")



Type: System.ComponentModel.Composition.CompositionException
Source: System.ComponentModel.Composition
   at System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine, ComposablePart part, ExportDefinition definition)

   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(ComposablePart part, ExportDefinition export, Boolean isSharedPart)

   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.CatalogExport.GetExportedValueCore()

   at System.ComponentModel.Composition.Primitives.Export.get_Value()

   at System.ComponentModel.Composition.ExportServices.GetExportedValueFromLazy[T](Export export)

   at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportedValueCore[T](String contractName, ImportCardinality cardinality)

   at Fiddler.Proxy..ctor(Boolean isPrimary, ProxySettings upstreamProxySettings) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\Proxy.cs:line 208

   at Fiddler.frmViewer.‹•(String[] ˆ•) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 2906

   at Fiddler.frmViewer.‡•(String[] ˆ•) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 2723


Fiddler v5.0.20192.25091 (x86 x86) [.NET 4.0.30319.1 on Microsoft Windows NT 5.1.2600 Service Pack 3]
---------------------------
OK   
---------------------------


As the result - can't start Fiddler any more.
Heeelp