{"record":{"id":"045097dbe740a231","repo":"BoundaryML/baml","slug":"baml-fetch-as-http-request-failed-http-body-at","errorCode":null,"errorMessage":"baml.fetch_as: HTTP request failed: HTTP {}\nBody: {} at {:?}","messagePattern":"baml\\.fetch_as: HTTP request failed: HTTP (.+?)\nBody: (.+?) at (.+?)","errorType":"http","errorClass":null,"httpStatus":null,"severity":"error","filePath":"engine/baml-compiler/src/thir/interpret.rs","lineNumber":2774,"sourceCode":"            };\n\n            let target_type = &type_args[0];\n\n            // Make HTTP request\n            let response = reqwest::get(&url).await.with_context(|| {\n                format!(\n                    \"baml.fetch_as: failed to fetch URL '{}' at {:?}\",\n                    url, meta.0\n                )\n            })?;\n\n            let status = response.status();\n            if !status.is_success() {\n                let body = response\n                    .text()\n                    .await\n                    .unwrap_or_else(|_| \"<failed to read body>\".to_string());\n                bail!(\n                    \"baml.fetch_as: HTTP request failed: HTTP {}\\nBody: {} at {:?}\",\n                    status,\n                    body,\n                    meta.0\n                );\n            }\n\n            let body = response.text().await.with_context(|| {\n                format!(\n                    \"baml.fetch_as: failed to read response body at {:?}\",\n                    meta.0\n                )\n            })?;\n\n            // Parse the JSON body into the target type\n            let parsed_value = parse_json_to_baml_value(&body, target_type, meta)?;\n            Ok(parsed_value)\n        }","sourceCodeStart":2756,"sourceCodeEnd":2792,"githubUrl":"https://github.com/BoundaryML/baml/blob/bd85ce9dee1463ff04d27efd20531013a4ff46c1/engine/baml-compiler/src/thir/interpret.rs#L2756-L2792","documentation":"baml.fetch_as performs an HTTP GET of the given URL and requires a success (2xx) status. When the response status is not successful, it throws this error embedding the HTTP status code and the response body (or a placeholder if the body could not be read).","triggerScenarios":"Calling baml.fetch_as::<T>(url) against a URL that returns 404, 500, 401, 403, 429, or any other non-2xx status.","commonSituations":"Wrong endpoint path or port; server-side bug producing a 500; expired auth so the remote returns 401/403; rate limiting (429); calling a URL that no longer exists.","solutions":["Read the HTTP status and body included in the error message to identify the server-side cause","Fix the URL (path, host, port) if it is wrong","Add/refresh authentication (query param, header, token) if the status is 401/403","Handle 429 by backing off and retrying; investigate server logs for 5xx"],"exampleFix":"// before\nlet v = baml.fetch_as::<MyType>(\"http://host:9000/wrong-path\")\n// after\nlet v = baml.fetch_as::<MyType>(\"http://host:9000/correct-path\")","handlingStrategy":"try-catch","validationCode":"// Pre-check the endpoint returns 2xx before relying on fetch_as:\n// curl -s -o /dev/null -w \"%{http_code}\" \"$URL\"  # expect 2xx","typeGuard":null,"tryCatchPattern":"match evaluate_builtin_function(...).await {\n    Err(e) if e.contains(\"baml.fetch_as: HTTP request failed\") => {\n        // log status/body from message; retry on 429/5xx, fail fast on 4xx\n    }\n    other => other?,\n}","preventionTips":["Validate endpoint URLs with a smoke request before production use","Handle 401/403 by keeping credentials current","Back off and retry on 429/5xx","Monitor remote service health"],"tags":["baml","http","network","fetch"],"backgroundTag":"http-error-response","analyzedSha":"bd85ce9dee1463ff04d27efd20531013a4ff46c1","analyzedAt":"2026-09-12T03:38:25.718Z","contentChangedAt":"2026-09-12T03:38:25.718Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}