PowerShell: Invoke-WebRequest - Cannot validate argument on parameter 'Uri'

Question

I'm trying to help a developer who is trying to harden a web server against server-side request forgery. In short, I've wrote a script that sends a "forged" HTTP request which we will use to test against the server until it is configured to not respond to such manipulated requests. I'm getting an error on Invoke-WebRequest: "Cannot validate argument on parameter 'Uri'" and while I've tried a ton of different combos of the below code I cannot get it to fly. Any thoughts? (Note: my-ef.example.com below is not the actual host)

#requires -Version 5
#requires -PSEdition Desktop

class TrustAllCertsPolicy : System.Net.ICertificatePolicy {
    [bool] CheckValidationResult([System.Net.ServicePoint] $a,
                                 [System.Security.Cryptography.X509Certificates.X509Certificate] $b,
                                 [System.Net.WebRequest] $c,
                                 [int] $d) {
        return $true
    }
}
[System.Net.ServicePointManager]::CertificatePolicy = [TrustAllCertsPolicy]::new()

$Params = @{
Uri = 'http://192.168.1.119'
Host = 'my-ef.example.com'
Method = 'GET'
Headers = @{"Cache-Control" = "no-cache, no-transform"; "Connection" = "close"; "Pragma" = "no-cache"}
}
Invoke-WebRequest -Method 'POST' -Uri $url

The above code always throws the error:

Invoke-WebRequest : Cannot validate argument on parameter 'Uri'. The argument is null or empty. Provide an argument that is not null or empty, and then try the command again.

Cpt.Whale · Accepted Answer · 2021-06-15 21:03:54Z

2

$url is never specified in your code. Did you mean to run this?

Invoke-WebRequest @Params

answered Jun 15, 2021 at 21:03

Cpt.Whale

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2 Comments

T-Heron Over a year ago

Nice catch. Changing the bottom line to that does change the error to: "Invoke-WebRequest : A parameter cannot be found that matches parameter name 'Host'." Any ideas on that one?

Cpt.Whale Over a year ago

@T-Heron Invoke-WebRequest doesn't have a "Host" parameter. You can set it as a header if needed by adding Host = 'my-ef.example.com' to the Headers=@{...} block.

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