[issue21472] Fix wsgiref handling of absolute HTTP Request-URI

[Robert Collins]

Robert Collins added the comment:

Oh, also - while its tempting to say that it doesn't matter whether we take the urls host portion, or the host header or the server name - it does. Deployments that look like:

LB/Firewall <-> backend container -> WSGI app

are likely to have assumptions within the WSGI app about what sort of urls they expect to reach them. We can mitigate this by being very explicit about whatever solution we have.

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