Hi, we are hosting web api controllers using kestrel (.net 7, c#, self hosted (not within IIS))

Within a controller we use a HttpClient to make a simple get request (https), but we are not seeing the request in fiddler everywhere (Http2 is activated in the settings and also the certificate stuff is activated).

The request to the controller (https & http2) is captured by fiddler, but not the httpclient call (the problem occurs on Win Server 2016), we are using the server name to call the controller (not localhost).

However if I create a console app, add the HttpClient call and start the console, fiddler does capture the call as expected.

I also tried netsh winhttp set proxy 127.0.0.1:8866 as admin, but that also doesn't work.

Any ideas?

Br

As soon as we start Fiddler Everywhere for profiling we got the following error in our application whenever a gRPC-call is executed:

Connection id "0HMT23GS5CF6U", Request id "0HMT23GS5CF6U:00000001": An unhandled exception was thrown by the application.

Error: Grpc.Core.RpcException: Status(StatusCode="Internal", Detail="Error starting gRPC call. HttpRequestException: Unable to get subchannel from HttpRequestMessage. (127.0.0.1:8866) InvalidOperationException: Unable to get subchannel from HttpRequestMessage.", DebugException="System.Net.Http.HttpRequestException: Unable to get subchannel from HttpRequestMessage. (127.0.0.1:8866)") ---> System.Net.Http.HttpRequestException: Unable to get subchannel from HttpRequestMessage. (127.0.0.1:8866) ---> System.InvalidOperationException: Unable to get subchannel from HttpRequestMessage. at Grpc.Net.Client.Balancer.Internal.BalancerHttpHandler.OnConnect(SocketsHttpConnectionContext context, CancellationToken cancellationToken) at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken)

Any idea how to fix this?

br

Hello,

I have set up an upstream proxy that requires authentication. I'm using the Fiddler preference fiddler.defaultproxy to enter the IP address and port number.

Because this proxy requires authentication I'm also using fiddler.proxy.creds to store the user name and password in Base64 format as explained here: https://jegansblog.wordpress.com/2015/05/07/setup-fiddler-as-proxy-server-with-basic-authentication/

However, when I open a new browser window, I'm am getting the authentication prompt again:

Why is it not using the credentials stored in the fiddler.proxy.creds field? 

Hello,

I have a very strange behavior, I build on a Java program a request to query a site. For your information, here is the code, but it's not the root of the problem:

conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(SimpleCrawler.timeout);
		      conn.setReadTimeout(SimpleCrawler.timeout);
		      conn.setRequestProperty( "Host", url.getAuthority() );
		      conn.setRequestProperty( "User-Agent", userAgent );
		      conn.setRequestProperty( "Accept", SimpleCrawler.acceptPageType);//text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
		      conn.setRequestProperty( "Accept-Language", SimpleCrawler.acceptLanguage );
		      conn.setRequestProperty( "Accept-Encoding", "gzip, deflate, br" );
InputStream input = conn.getInputStream();
			  byte[] buffer = new byte[4096];
			  int n;

			  OutputStream output = new FileOutputStream( chemin );
			  while ((n = input.read(buffer)) != -1) 
			  {
			      output.write(buffer, 0, n);
			  }
			  output.close();

And the request downloads a corrupted file. Now if I go through fiddler with this code :

 Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 8888));
		    	  conn = (HttpURLConnection) url.openConnection(proxy);

I see the request go through Fiddler and the file downloads correctly.

It's as if Fiddler modified the return or the request by reorganizing something to correct a problem that was there before. But I can't figure out what it is, if I knew I'd fix my problem.

Do you have any idea why I am seeing this behavior?

Thanks