Propagate original request user-agent in proxy CONNECT requests #1742
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Following #1730, it appears that when using a proxy server and a custom user-agent header, the user-agent of the CONNECT request to the proxy server is not correctly set to be the custom one, but instead the default one.
This makes sure the user-agent header is propagated down to the CONNECT request as well, and changes the BasicHTTPToHTTPSTest to account for this as well (since they're logically similar - they both test for the existence of specific headers in the flow).
BTW: Propagate? Percolate? Bubble down? Simmer through? Feel free to change the phrasing.