[issue34975] start_tls() difficult when using asyncio.start_server()

[Ian Good]

Ian Good <icgood at gmail.com> added the comment:

I added start_tls() to StreamWriter. My implementation returns a new StreamWriter that should be used from then on, but it could be adapted to modify the current writer in-place (let me know).

I've added docs, an integration test, and done some additional "real-world" testing with an IMAP server I work on. Specifically, "openssl s_client -connect xxx -starttls imap" works like a charm, and no errors/warnings are logged on disconnect.

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type:  -> enhancement

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<https://bugs.python.org/issue34975>
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