Be ready to process response headers sent before the post tunnel is finished #7976
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This PR sets up the response header read in parallel with the post tunnel. In some cases the origin may return an error response header for a POST before processing all the post data. With the current code that response is lost if the server closes the connection.
This PR is built upon PR #7962. Once that is committed, I will rebase this branch. All references to 100-continue belong with that PR.
I have added some tests to try and exercise the early server response.
This closes #4006