{"record":{"id":"93646cfa3bf63bbd","repo":"nautechsystems/nautilus_trader","slug":"failed-to-parse-method-response","errorCode":null,"errorMessage":"Failed to parse {method} response","messagePattern":"Failed to parse (.+?) response","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/rpc/http.rs","lineNumber":337,"sourceCode":"            \"id\": 1,\n            \"method\": method,\n            \"params\": params,\n        });\n\n        let bytes = self\n            .send_rpc_request(request, Some(EXECUTION_RPC_TIMEOUT_SECS))\n            .await\n            .map_err(|e| match e {\n                BlockchainRpcClientError::ClientError(message)\n                    if message.contains(\"redirect response rejected\") =>\n                {\n                    anyhow::anyhow!(\"{method} redirect rejected\")\n                }\n                _ => anyhow::anyhow!(\"{method} request failed\"),\n            })?;\n\n        let parsed = serde_json::from_slice::<RpcNodeHttpResponse<T>>(bytes.as_ref())\n            .map_err(|_| anyhow::anyhow!(\"Failed to parse {method} response\"))?;\n\n        if parsed.jsonrpc.is_none()\n            && let (Some(code), Some(_message)) = (parsed.code, parsed.message)\n        {\n            anyhow::bail!(\"{method} RPC error {code}\");\n        }\n\n        if let Some(error) = parsed.error {\n            anyhow::bail!(\"{method} RPC error {}\", error.code);\n        }\n\n        Ok(parsed.result)\n    }\n\n    /// Returns the chain ID reported by the RPC node via `eth_chainId`.\n    ///\n    /// # Errors\n    ///","sourceCodeStart":319,"sourceCodeEnd":355,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/rpc/http.rs#L319-L355","documentation":"Raised when the raw HTTP body of an execution RPC response cannot be deserialized into the expected `RpcNodeHttpResponse<T>` envelope. The library requires a JSON body matching the JSON-RPC response shape; anything else (HTML, empty body, truncated JSON) fails parsing.","triggerScenarios":"The node or an intermediary returns a non-JSON body for chain_id, get_storage_at, get_code, or get_transaction_count calls — e.g. an HTML error page from a gateway, an empty 200 response, or malformed JSON.","commonSituations":"Reverse proxy (nginx/Cloudflare) intercepting errors, hitting a REST endpoint instead of the JSON-RPC endpoint, or rate-limit pages from public RPC providers.","solutions":["Inspect the raw response body (curl the endpoint with the same method) to see what is returned","Point the client at the correct JSON-RPC path rather than a web/REST endpoint","Disable/adjust proxy error-interception pages for the RPC route","Check provider rate limits and authentication headers"],"exampleFix":"// before: hitting wrong path\nlet url = \"https://provider.example.com/v1/mainnet\";\n// after: correct JSON-RPC endpoint\nlet url = \"https://provider.example.com/v1/mainnet/rpc\";","handlingStrategy":"validation","validationCode":"// ensure endpoint returns JSON-RPC envelope before use:\n// curl -s -X POST $URL -d '{\"jsonrpc\":\"2.0\",\"method\":\"eth_chainId\",\"params\":[],\"id\":1}' \\\n//   | python -c 'import json,sys; json.load(sys.stdin)'","typeGuard":null,"tryCatchPattern":"match client.chain_id().await {\n    Err(e) if e.to_string().contains(\"Failed to parse\") => {\n        // endpoint returned non-JSON; switch URL or inspect raw body\n    }\n    other => other,\n}","preventionTips":["Point clients at the JSON-RPC path, not REST/web endpoints","Disable HTML error pages on proxies for RPC routes","Authenticate properly so gateways don't replace bodies with error pages","Test new providers with a raw curl before wiring them in"],"tags":["rpc","json","response-parsing","deserialization"],"backgroundTag":"unexpected-response-shape","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}