WebCmdlets check if absolute uri before checking scheme

[CarloToso]

PR Summary

• Check if absolute uri before checking scheme

History:

• HttpClient does not allow insecure redirect (Https to Http)
• I added -AllowInsecureRedirect to follow the redirect anyway Add AllowInsecureRedirect switch to Web cmdlets #18546
• I added an error to increase the discoverability of -AllowInsecureRedirect Webcmdlets display an error on https to http redirect #18595
• Webcmdlets display an error on https to http redirect #18595 checks if the origin uri scheme is https and the destination uri scheme is http and throws an error
• this introduces a bug Insecure Proxy Behavior with Invoke-(RestMethod|WebRequest) on 7.4.0-preview2 #19461 if the uris have no scheme (they are not absolute but relative)

PR Context

Fix #19461

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[iSazonov]

Please add new test.

[iSazonov]

Before the fix was it "InsecureRedirection" exception? Could you please explain why now it is WebCmdletWebResponseException?

[CarloToso]

I introduced "InsecureRedirection" exception in #18595, previously it was WebCmdletWebResponseException.
If the uri has no scheme checking for a scheme would throw an error, so we skip the check and we go back to the old error on https to http redirection

[daxian-dbw]

The issue author has confirmed the fix solves the issue for his scenarios: #19461 (comment)

@CarloToso please update the comment as we discussed in #19468 (comment) and then I will merge the PR. Thanks!

[CarloToso]

@daxian-dbw done

[ghost]

🎉v7.4.0-preview.3 has been released which incorporates this pull request.:tada:

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