Adding documentation on the ISSO_CORS_ORIGIN env variable - close
@@ -353,3 +353,18 @@ Timedelta
You can add different types: `1m30s` equals to 90 seconds, `3h45m12s`
equals to 3 hours, 45 minutes and 12 seconds (12512 seconds).
+
+Environment variables
+---------------------
+
+.. _environment-variables:
+
+Isso also support configuration through some environment variables:
+
+ISSO_CORS_ORIGIN
+ By default, `isso` will use the `Host` or else the `Referrer` HTTP header
+ of the request to defines a CORS `Access-Control-Allow-Origin` HTTP header
+ in the response.
+ This environent variable allows you to define a broader fixed value,
+ in order for example to share a single Isso instance among serveral of your
+ subdomains : `ISSO_CORS_ORIGIN=*.example.test`
