Fiddler not intercepting PowerShell web requests

问题:

I'm trying to use Fiddler to help someone troubleshoot an issue with Invoke-RestMethod calls to an ASP.NET WebAPI. Unfortunately, when I call Invoke-RestMethod in PowerShell, Fiddler is not intercepting the HTTP communications.

When I use Internet Explorer to browse the root of the ASP.NET website, which is part of the same application, Fiddler intercepts traffic as expected.

Can anyone explain why Fiddler is not capturing HTTP traffic through PowerShell, and how to resolve this?

回答1:

Fiddler actually works via a proxy, and automatically sets proxy settings in IE when running. You can check this by launching fiddler and then checking "Lan Settings" under Internet Options > Connection.

Invoke-RestMethod has a -Proxy parameter you can use to point to Fiddler's proxy. I think the default is 127.0.0.1:8888 :

Invoke-RestMethod -Proxy 'http://127.0.0.1:8888' ....

Edit: Adding screenshot to confirm the answer above.

回答2:

I had a similar issue (with Powershell & Fiddler2 ) while installing NPM packages.

It worked after setting up Fiddler as a Reverse Proxy then using the command mentioned in the answer here (thanks for that JNK).

Step-by-step instructions below:

1. Follow the steps mentioned here and write the one line FiddlerScript Rule to use Fiddler as a Reverse Proxy.

In my case it was:

if (oSession.host.toLowerCase() == "127.0.0.1:8888") oSession.host = "127.0.0.1:80";

2. Then in PowerShell use the configured proxy settings:

PS F:> npm install yo -g -proxy 'http://127.0.0.1:8888'

3. Now the PowerShell traffic should flow through Fiddler.