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# announcementsw
worried-planet-2191
05/19/2023, 8:34 PMThis message was deleted.
f
fresh-football-47124
05/20/2023, 1:45 AM
Are you getting a CORS error or any other message in console?
fresh-football-47124
05/20/2023, 1:47 AM
you can set an environment variable: CORS_ORIGIN_REGEX to match the domains GrowthBook is running on
b
brief-traffic-36675
05/20/2023, 6:19 AMI mage the change that @happy-autumn-40938 suggested using
Copy code
APP_ORIGIN: <https://my.growthbook.mydomain.com>
API_HOST: <https://my.growthbook.mydomain.com>brief-traffic-36675
05/20/2023, 6:21 AMThe question is: the front end is trying to connect to the backend using the value of
API_HOST<http://localhost:3100>f
fresh-football-47124
05/20/2023, 7:33 AM
using the same value for APP_ORIGIN and API_HOST wont work
fresh-football-47124
05/20/2023, 7:33 AM
it will send api request to itself - which will return html, as you’re seeing there
fresh-football-47124
05/20/2023, 7:34 AM
I think you were very close to getting it to work
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b
brief-traffic-36675
05/20/2023, 7:58 AMSo given that the instance is exposed at
<https://my.growthbook.mydomain.com>API_HOSTAPP_ORIGINf
fresh-football-47124
05/20/2023, 9:06 PM
The API_HOST must be a routable address to the api container from the front end app. The APP_ORIGIN is used for the CORS headers to make sure the request from the front end is from the right host.
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