API key error for WMATA

[MrMastodonFarm]

When configured per the documentation, WMATA rejects the attempt to connect to the trip updates URL (https://api.wmata.com/gtfs/rail-gtfsrt-tripupdates.pb) because it says no API key was supplied, even when api_key has a value set in the configuration file. I fixed the issue by changing:

self._headers = {"Authorization": api_key}

to

self._headers = {"api_key": api_key}

in /config/custom_components/gtfs_rt/sensor.py .

It seems WMATA wants the API key presented as "api_key: " instead of "Authorization: ".