{"record":{"id":"f884a11971b95d6f","repo":"BoundaryML/baml","slug":"failed-to-get-body-w-rawobjects-http-response","errorCode":null,"errorMessage":"failed to get body: %w","messagePattern":"failed to get body: %w","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"engine/language_client_go/pkg/rawobjects_http_response.go","lineNumber":72,"sourceCode":"\nfunc (h *httpResponse) Headers() (map[string]string, error) {\n\tresult, err := raw_objects.CallMethod(h, \"headers\", nil)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to get headers: %w\", err)\n\t}\n\n\theaders, ok := result.(map[string]string)\n\tif !ok {\n\t\treturn nil, fmt.Errorf(\"unexpected type for headers: %T\", result)\n\t}\n\n\treturn headers, nil\n}\n\nfunc (h *httpResponse) Body() (HTTPBody, error) {\n\tresult, err := raw_objects.CallMethod(h, \"body\", nil)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to get body: %w\", err)\n\t}\n\n\tbody, ok := result.(HTTPBody)\n\tif !ok {\n\t\treturn nil, fmt.Errorf(\"unexpected type for body: %T\", result)\n\t}\n\n\treturn body, nil\n}\n","sourceCodeStart":54,"sourceCodeEnd":82,"githubUrl":"https://github.com/BoundaryML/baml/blob/bd85ce9dee1463ff04d27efd20531013a4ff46c1/engine/language_client_go/pkg/rawobjects_http_response.go#L54-L82","documentation":"Thrown by httpResponse.Body() in BAML's Go client when raw_objects.CallMethod(h, \"body\") fails at the FFI boundary; the core-side error is wrapped with %w. It means the \"body\" method could not be invoked on the raw response object, distinct from a wrong body type.","triggerScenarios":"Calling HTTPResponse.Body() on a raw object handle the core cannot resolve or that rejects the \"body\" method — stale/expired pointer, object created by a different runtime, or bindings/core version drift.","commonSituations":"Body extraction in BAML log/event pipelines after runtime teardown; mismatched versions after upgrading the engine.","solutions":["Unwrap the error to see the underlying FFI cause","Re-acquire the HTTPResponse from the active runtime instead of caching handles","Align Go bindings and BAML core versions","Handle body absence gracefully (return a typed error to callers instead of panicking)"],"exampleFix":"body, err := resp.Body()\nif err != nil {\n    return fmt.Errorf(\"cannot read response body: %w\", err)\n}","handlingStrategy":"try-catch","validationCode":"if resp == nil { return errors.New(\"nil HTTPResponse\") }","typeGuard":null,"tryCatchPattern":"body, err := resp.Body()\nif err != nil {\n    return fmt.Errorf(\"response body unavailable: %w\", err)\n}","preventionTips":["Re-acquire response objects from the active runtime","Handle body absence explicitly in log processors","Keep engine and Go bindings aligned"],"tags":["go","ffi","baml","method-call"],"backgroundTag":"api-request-failed","analyzedSha":"bd85ce9dee1463ff04d27efd20531013a4ff46c1","analyzedAt":"2026-09-12T03:38:25.718Z","contentChangedAt":"2026-09-12T03:38:25.718Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}