IPv6 support

[tambry]

Encountered the problem while setting up a small IPv6-only API endpoint.

Minimal code:

from flask import Flask

app = Flask(__name__)

@app.route("/", methods=["GET"])
def hello(res):
        print("Hello world")

if __name__ == "__main__":
        import bjoern
        bjoern.run(app, "::1", 2018)

Error:

Traceback (most recent call last):
  File "vpmf.py", line 12, in <module>
    bjoern.run(app, '::1', 2018)
  File "/usr/local/lib64/python3.6/site-packages/bjoern.py", line 68, in run
    listen(*args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/bjoern.py", line 52, in listen
    sock = bind_and_listen(host, port, reuse_port)
  File "/usr/local/lib64/python3.6/site-packages/bjoern.py", line 30, in bind_and_listen
    sock.bind((host, port))
socket.gaierror: [Errno -9] Address family for hostname not supported

[tambry]

Just noticed there's also a patch for it in #99.

[jonashaag]

Yes, please continue discussion/work there.