I have REST api. I am trying to configure AWS API Gateway as a passthrough. My api endpoint domain has subdomain part, which indicates tenant identity. Ex. customername.xyz.com/api. I need the API Gateway url as xyz.com/api. In this case, all the requests from all the customers will come to xyz.com/api. However, I need to redirect the request to specific customer api endpoint based on on of the headers. Ex. header name is ‘x-cust-domain’. A value in this header would be customerName, which is nothing but the subdomain part of the endpoint url. Ex. customername.xyz.com/api. So an api call comes to api gateway and the api gateway redirects it to the right customer endpoint.

Could someone please explain the difference between accessing Lambda via the test gateway API (proxy) and CLI?