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Asked: 2026-05-17T16:23:28+00:00

I am tring to debug whats wrong with my HTTP requests from another question

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I am tring to debug whats wrong with my HTTP requests from another question here on SO. So i read a bit about Fiddler and wanted to use it to debug my problem. But I can’t seem to get traffic from my WPF application to go through Fiddler. I believe I need to configure a proxy. I am using a WebClient for a basic example, but I think i will require a WebRequest later. But for now, with a simple WebClient, how can I get it to go through Fiddler (I believe I have to set proxy to localhost:8888)?

UPDATE:

I don’t know if i did the right thing or not but I tried 

var wc = new WebClient();
WebProxy proxy = new WebProxy();
proxy.Address = new Uri("http://localhost:8888");
wc.Proxy = proxy;

but failed – I don’t see any traffic in Fiddler

I tried …

var wc = new WebClient();
WebProxy proxy = new WebProxy("127.0.0.1", 8888);
wc.Proxy = proxy;

still nothing

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1 Answer

  1. Editorial Team

    I found the solution at this fiddler2.com page

    Why don’t I see traffic sent to
    http://localhost or http://127.0.0.1?

    Internet Explorer and the .NET Framework are hardcoded not to send
    requests for Localhost through any
    proxies, and as a proxy, Fiddler will
    not receive such traffic.

    The simplest workaround is to use your machine name as the hostname
    instead of Localhost or 127.0.0.1. So,
    for instance, rather than hitting
    http://localhost:8081/mytestpage.aspx,
    instead visit
    http://machinename:8081/mytestpage.aspx.

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