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Sends the request, as described by the environ, over actual HTTP.
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This connects to the server given in SERVER_NAME:SERVER_PORT, and
sends the Host header in HTTP_HOST -- they do not have to match.
You can send requests to servers despite what DNS says.
Set ``environ['webob.client.timeout'] = 10`` to set the timeout on
the request (to, for example, 10 seconds).
Does not add X-Forwarded-For or other standard headers
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