{"record":{"id":"2caebd8cf7b52809","repo":"rohitg00/ai-engineering-from-scratch","slug":"message-must-be-an-object","errorCode":null,"errorMessage":"message must be an object","messagePattern":"message must be an object","errorType":"validation","errorClass":"ValueError","httpStatus":400,"severity":"error","filePath":"phases/13-tools-and-protocols/09-mcp-transports/code/main.py","lineNumber":426,"sourceCode":"        try:\n            reject_ambiguous_body_framing(self.headers)\n            raw_length = self.headers.get(\"Content-Length\")\n            if raw_length is None:\n                raise ValueError(\"Content-Length is required\")\n            if not raw_length.isascii() or not raw_length.isdigit():\n                raise ValueError(\"Content-Length must contain ASCII decimal digits\")\n            length = int(raw_length)\n            if not 1 <= length <= MAX_REQUEST_BYTES:\n                raise ValueError(\n                    f\"Content-Length must be from 1 through {MAX_REQUEST_BYTES}\"\n                )\n            self.connection.settimeout(READ_TIMEOUT_SECONDS)\n            body = self.rfile.read(length)\n            if len(body) != length:\n                raise ValueError(\"request body ended before Content-Length bytes arrived\")\n            message = json.loads(body)\n            if not isinstance(message, dict):\n                raise ValueError(\"message must be an object\")\n        except (ValueError, json.JSONDecodeError, TimeoutError) as exc:\n            self._write_json(400, rpc_error(None, -32700, \"Parse error\", {\"detail\": str(exc)}))\n            return\n\n        request_id = message.get(\"id\")\n        try:\n            body_version = validate_request_structure(message)\n            reject_duplicate_routing_headers(self.headers)\n            validate_http_headers(self.headers, message, body_version)\n            validate_supported_version(body_version)\n        except RpcFault as fault:\n            self._write_fault(400, request_id, fault)\n            return\n\n        if \"id\" not in message:\n            self.send_response(202)\n            self.end_headers()\n            return","sourceCodeStart":408,"sourceCodeEnd":444,"githubUrl":"https://github.com/rohitg00/ai-engineering-from-scratch/blob/39ea8a1c6d0b61f071226eff7ede4d4105fed820/phases/13-tools-and-protocols/09-mcp-transports/code/main.py#L408-L444","documentation":"Error \"message must be an object\" thrown in rohitg00/ai-engineering-from-scratch.","triggerScenarios":"Thrown at phases/13-tools-and-protocols/09-mcp-transports/code/main.py:426 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"39ea8a1c6d0b61f071226eff7ede4d4105fed820","analyzedAt":"2026-08-26T03:13:46.626Z","schemaVersion":2},"datasetVersion":"2026-08-26T07:17:17.940Z"}