football-data CORS proxy

Re-serves a few football-data.co.uk CSVs with an Access-Control-Allow-Origin header, so a browser script can read them. Nothing else is proxied.

• /fixtures.csv
• /mmz4281/<season>/D1.csv
• /mmz4281/<season>/D2.csv

Data belongs to football-data.co.uk. Responses are cached for an hour so this stays light on a free service.