Change default api client request body serialization

This commit makes a change in the default api client - request body
serialization. The earlier code has a conversion for the request
body to convert to json before triggering the APIs, without checking
the content type of the request. This would make incorrect API calls
if the request body is not of type JSON. This commit checks if the
request body content is of type json and only convert it. If not,
then send in the body unconverted, leaving the initial input as is.

ask-sdk-core/ask_sdk_core/api_client.py

@@ -67,7 +67,12 @@ def invoke(self, request):
                     "Requests against non-HTTPS endpoints are not allowed.")
 
             if request.body:
-                raw_data = json.dumps(request.body)
+                body_content_type = http_headers.get("Content-type", None)
+                if (body_content_type is not None and
+                        "json" in body_content_type):
+                    raw_data = json.dumps(request.body)
+                else:
+                    raw_data = request.body
             else:
                 raw_data = None
 

ask-sdk-core/tests/unit/test_api_client.py

@@ -184,16 +184,35 @@ def test_api_client_invoke_with_no_url_schema_throw_error(self):
 
             assert "Requests against non-HTTPS endpoints are not allowed." in str(exc.exception)
 
-    def test_api_client_send_request_with_raw_data(self):
+    def test_api_client_send_request_with_raw_data_serialized_for_json_content(
+            self):
         test_data = "test\nstring"
         self.valid_request.body = "test\nstring"
         self.valid_request.method = "POST"
+        headers = [("Content-type", "application/json")]
+        self.valid_request.headers = headers
 
         with mock.patch(
                 "requests.post",
                 side_effect=lambda *args, **kwargs: self.valid_mock_response
         ) as mock_put:
             actual_response = self.test_api_client.invoke(self.valid_request)
             mock_put.assert_called_once_with(
-                data=json.dumps(test_data), headers={},
+                data=json.dumps(test_data),
+                headers={'Content-type': 'application/json'},
+                url=self.valid_request.url)
+
+    def test_api_client_send_request_with_raw_data_unchanged_for_non_json_content(
+            self):
+        test_data = "test\nstring"
+        self.valid_request.body = "test\nstring"
+        self.valid_request.method = "POST"
+
+        with mock.patch(
+                "requests.post",
+                side_effect=lambda *args, **kwargs: self.valid_mock_response
+        ) as mock_put:
+            actual_response = self.test_api_client.invoke(self.valid_request)
+            mock_put.assert_called_once_with(
+                data=test_data, headers={},
                 url=self.valid_request.url)