PowerShell - Invoke-WebRequest - Relative URI not supported when using -Proxy

Question

i try to access websites through a proxy.

I tried the following:

$mycredentials = Get-Credential
Invoke-WebRequest -Uri heise.de -Proxy proxySrv -ProxyCredential $mycredentials

Invoke-WebRequest : Dieser Vorgang wird für einen relativen URI nicht unterstützt. In Zeile:1 Zeichen:1 + Invoke-WebRequest -Uri heise.de -Proxy proxySrv -Prox ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [Invoke-WebRequest], InvalidOperationException + FullyQualifiedErrorId : System.InvalidOperationException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

Translation of error to English:

Invoke-WebRequest : This operation is not supported for a relative URI. In line: 1 character: 1 + Invoke-WebRequest -Uri heise.de -Proxy proxySrv -Prox ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [Invoke-WebRequest], InvalidOperationException + FullyQualifiedErrorId : System.InvalidOperationException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

If I attempt the command without the Proxy setting I get an error from our proxy.

Can you help figure out why?

Can you try to full qualify the URI like "https ://heise.de" — Martin Brandl
– Martin Brandl, Commented Mar 1, 2017 at 7:50
same error, also tryed proxy IP instead of name Invoke-WebRequest -Uri ht"tps://heise.de -Proxy 192.168.222.222:8080 -ProxyCredential $mycredentials — Steakschen
– Steakschen, Commented Mar 1, 2017 at 8:53

Chris F Carroll · Accepted Answer · 2019-08-13 17:16:22Z

18

The relative URL being complained about is the proxy URL, not the target URL. Replace:

-Proxy 192.168.222.222:8080

with

-Proxy http://192.168.222.222:8080

(or https if appropriate) and you should find the error goes away

edited Aug 13, 2019 at 17:16

answered Mar 14, 2017 at 11:48

Chris F Carroll

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