[issue26045] Improve error message for http.client when posting unicode string

[Martin Panter]

Martin Panter added the comment:

Personally I am skeptical if suggesting UTF-8 for the body data is a good idea, but I can go along with it, since other people want it. But I do strongly question whether it is right to suggest UTF-8 for header fields. The RFC <https://tools.ietf.org/html/rfc7230#page-26> only mentions ASCII and Latin-1.

Newer protocols based on HTTP (RTSP comes to mind) do specify UTF-8 for the header, but that is probably out of scope of both the HTTP module and beginner-targetted errors.

If I were redoing this patch, I would drop all the changes except at the body.encode() line in Emil’s original post.

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stage:  -> patch review

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<http://bugs.python.org/issue26045>
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