PLAIN auth with http transport fails producing valid BASIC auth header for long username/password combinations

[paulmayer]

Impyla version: v0.18.0
Python version: 3.10.9

Minimal Example:

from impala.dbapi import connect

con = connect(
    "https://my-impala-host",
    auth_mechanism="PLAIN",
    use_http_transport=True,
    user="foo",
    password="this-is-a-very-long-password-that-is-really-very-long-and-goes-even-longer",
)

con.cursor()

Produces ValueError: Invalid header value b'Basic Zm9vOnRoaXMtaXMtYS12ZXJ5LWxvbmctcGFzc3dvcmQtdGhhdC1pcy1yZWFsbHktdmVyeS1sb25n\nLWFuZC1nb2VzLWV2ZW4tbG9uZ2Vy'

Expected Behavior:

Long password and user tuples are gracefully handled, either by setting limits or by robustly producing Basic auth headers also for long user/password combinations

Where is this problem coming from?

base64.encodebytes inserts newlines after every 76 bytes of output. These would need to be filtered out here

Alternatively, use base64.b64encode