REST API service when called from azure APIM returning empty response body with Status code 200

Question

I have added my REST api service in Azure API Management. I have followed all the steps given in this link Azure APIM. API works fine in local. It also works when accessed through published URL.

I have added OAuth2.0 security as well which is passing through fine.

My issue is When i try to access the operation through APIM published URL, the service is giving response 200 with empty content.

Can Someone please help.

Answer 1

This problem occurs when people unintentionally delete the top level policy and remove the main forward-request policy that applies to all operations on all apis. Simply click the Add policy button to re-add the default policy at the top level scope.

Answer 2

Old question, but I'm posting because I had a similar issue (empty response) caused by a different issue:

I was getting empty responses as I had expressions in a policy that read the response. By default, reading the response clears it (presumably because its a stream underneath).

Found some good docs here: https://learn.microsoft.com/en-us/azure/api-management/api-management-transformation-policies#SetBody

I fixed this by specifying "preserve content" when reading the response:

JObject responseJobj = null;
if (context.Response.Body != null) 
{ 
    responseJobj = context.Response.Body.As<JObject>(preserveContent: true); 
}