Post data to a form via Proxy

I want to be able to submit a webform with some values, however my simple code just says:-

Invoke-WebRequest : This operation is not supported for a relative URI.
At D:\Desktop\Post Data - Invoke.ps1:2 char:9
+ $test = Invoke-WebRequest -Uri http://http://localhost/TestForm.php -Method POST ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Invoke-WebRequest], InvalidOperationException
    + FullyQualifiedErrorId : System.InvalidOperationException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand




My code is quite simple, and dont see why it should not work:-
$postParams = @{username='me';moredata='qwerty'}
$test = Invoke-WebRequest -Uri http://http://localhost/TestForm.php -Method POST -Body $postParams -Proxy '192.168.1.120:3128'

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Any ideas?

Thank you
tonelm54Asked:
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Dave BaldwinFixer of ProblemsCommented:
You've 'http://' in there twice.  http://http:// makes it an invalid URL.
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tonelm54Author Commented:
DOH!!!!
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