Document SNI compatible mode on Python 2.x about devpi

[devpi-bot]

Original comment by @jezdez

Oh I forgot what SNI is, it helps hosters to not have to have one IP per SSL-enabled endpoint: http://en.wikipedia.org/wiki/Server_Name_Indication

[devpi-bot]

Original comment by @hpk42

maybe a good time to consider allowing a devpi-server[sni] extra which would pull in the deps? (have never packaged extras, though)

[devpi-bot]

Original comment by @jezdez

Sure, sounds like a plan!

[devpi-bot]

Original comment by @hpk42

unreleased

avoid depending on requests-2.0.1 which does not support SNI.
addresses issue21

→ <>

[devpi-bot]

Original comment by @hpk42

So requests/pip on python3 support SNI without any extra dependencies?

I am thinking of just adding the dependencies to "devpi-client" on Python2 so users don't have to worry.

[devpi-bot]

Original comment by @fschulze

With environment markers we can easily add the dependency, we just need confirmation on which dependencies are needed.

[devpi-bot]

Original comment by @jhermann

An easy way to achieve this is depending on requests[security] (only needed for <2.7.9 afaik).

[devpi-bot]

Original comment by @fschulze

I consider this obsolete now. SNI is supported since 2.7.9.

See https://www.python.org/downloads/release/python-279/ and https://www.python.org/dev/peps/pep-0466/