Hey, there! So Ive been using fidler for a while so i decided to try to sniff the requests out from a mobile app. And for some reason it didn't work. I have the certificate and everything set up. So i googled it and i saw one guy who converted the apk of a random apk (Im on android) and put a network_secutity_config.xml file in there that basically tells the app to trust the trusted certificates. It didn't work this way either so im just lost at this point. Do you know anything about this?

Basically the app just doesn't send the requests when sniffing with fiddler. They appear but in some weird ciphered format and it doesn't even give me a response.

I trying to test a simple demo application written in Visual Studio C++. However nothing is logged in Fiddler 4 when the program runs.

I complied the code from here on my Win10 m/c using VS 2017 community:

https://www.codeproject.com/Articles/66625/A-Fully-Featured-Windows-HTTP-Wrapper-in-C

I am running this simple function which does a 'GET'

void SimpleGetTest(void)
{
    wprintf(L"SimpleGetTest\r\n");

    // Set URL.
    WinHttpClient client(L"http://www.codeproject.com/");

    // Send http request, a GET request by default.
    client.SendHttpRequest();

    // The response header.
    wstring httpResponseHeader = client.GetResponseHeader();

    // The response content.
    wstring httpResponseContent = client.GetResponseContent();

    wprintf(L"<%ws>\r\n", httpResponseContent.c_str());
}

 

When I run the program the console output shows HTML response content just fine, Fiddler sees nothing.

 

If I stick "http://www.codeproject.com/" into my Firefox Fiddler does see the traffic ok.

 

I am very new to Fiddler and I downloaded it a few days ago and I am using it with the default settings. Is there some setting I need to change so it sees the traffic from my code?

 

As a matter of interest when I start VS Studio I can see traffic in Fiddler for the connection to Microsoft VS site.

 

 

I have a capture made with Wireshark of HTTP traffic going through ports 81 and 105. When importing the PCap, Fiddler shows me the transactions going on port 81 but nothing from port 105. I'm able to see them in WS after telling it that port 105 contains HTTP traffic.

Is there something similar for Fiddler?

Hi All,

Recently, I discovered Fiddler is able to show Secured Direct Download Link for Web Installers. Unfortunately, Fiddler failed to capture any web traffic for this application.

Is there a way around this issue? Thanks.

Hi I got issues after my last reboot of the computer (after an update) Fiddler does no longer capture any data. 

I started the Troubleshoot in the help menu and got the comment "Hidden due to FTS>OnlyProcessID" for everything. 

What do I need to do to fix this issue?

 

I have tried to reinstall Fiddler so I do have the latest version: v5.0.20194.41348 for .NET 4.6.1, Built: den 3 oktober 2019

 

Thank you in advance!

I'm debugging a .Net Core project using VS For Mac and Safari. Fiddler does not capture traffic to "localhost", only to external addresses. How can I fix this?

Hi All,

I am using Fiddler to Switch the Hostnames with IP address so that I can access my personal email from my work pc. It used to work until recently but from last week I am unable to open Gmail or outlook. Before the host is switched by Fiddler our office proxy system detecting the host name and blocking it. How can this be solved?

Thanks in Advance.

hello, sorry for my english!

i have url for example: https://somesite.com/index.php?var=123&var2=3333&smoethingelse=1111

and how with AutoResponder i can replace this url to: https://OTHERSITE.COM?url=https://somesite.com/index.php?var=123&var2=3333&smoethingelse=1111



i try use this:     regex:(?insx).+(1111|2222|3333).+$ 
and local file to return:     https://OTHERSITE.COM?url=$1
but returnning only https://OTHERSITE.COM?url=3333, not full URL ;( can you help me?

Hello,

I'm developing a frontend against our clients api. Since it is not very reliable, I'd like to record the apis responses and work with them.
So I saved the responses to a file and configured AutoResponser to serve those instead of passing through.

However, as soon as I lose internet connection, Fiddler get's stuck when trying to establish a SSH tunnel to the api - even though this should not be required since AutoResponder is activated for that specific request.

Is there anything I can do?

Kind regards
Patrick

After installing (on Windows XP SP3), the latest version gives the following error:

---------------------------
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="C:\Program Files\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="C:\Program Files\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 4.0.30319.2045 on Microsoft Windows NT 5.1.2600 Service Pack 3]
---------------------------
OK   
---------------------------

The previous version, 5.0.20182.28034, works without any errors at all.

Thanks.