fix: Handle non-json error responses

seam/client.py

@@ -61,6 +61,9 @@ def _handle_error_response(self, response: requests.Response):
         if status_code == 401:
             raise SeamHttpUnauthorizedError(request_id)
 
+        if not self._is_api_error_response(response):
+            response.raise_for_status()
+
         error = response.json().get("error", {})
         error_type = error.get("type", "unknown_error")
         error_message = error.get("message", "Unknown error")
@@ -76,3 +79,34 @@ def _handle_error_response(self, response: requests.Response):
             raise SeamHttpInvalidInputError(error_details, status_code, request_id)
 
         raise SeamHttpApiError(error_details, status_code, request_id)
+
+    def _is_api_error_response(self, response: requests.Response) -> bool:
+        try:
+            content_type = response.headers.get("content-type", "")
+
+            if not isinstance(content_type, str) or not content_type.startswith(
+                "application/json"
+            ):
+                return False
+        except ValueError:
+            return False
+
+        try:
+            data = response.json()
+        except requests.exceptions.JSONDecodeError:
+            return False
+
+        if not isinstance(data, dict):
+            return False
+
+        error = data.get("error")
+
+        if not isinstance(error, dict):
+            return False
+
+        if not isinstance(error.get("type"), str) or not isinstance(
+            error.get("message"), str
+        ):
+            return False
+
+        return True