AWS API Gateway returns 301/403 instead of the expected response

Hi there. New to AWS.

I set up an AWS API Gateway and set up a proxy integration as per this guide: https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-create-api-as-simple-proxy-for-http.html It works perfectly for the guide above. I tried doing exactly the same thing but instead of petstore, i just gave the url for my django app running on an ec2 server (the app itself runs smoothly). When i try to test the gateway method from the "test" tab, it gives 301. When I try to send a request via postman or curl, i get 403 forbidden. In neither case, do i get the actual response that i should be getting if i hit the url directly without going via api gateway. Any ideas as to what's going on here?