Update API to return no content for handlers without a response

api/lambda.go

@@ -273,6 +273,10 @@ func (api Api) Handler(baseCtx context.Context, apiGatewayProxyReq events.APIGat
 		}
 		res.Headers["Content-Type"] = "application/json"
 		res.Body = string(bodyBytes)
+	} else {
+		//no content
+		delete(res.Headers, "Content-Type")
+		res.Body = ""
 	}
 	return
 }