{"record":{"id":"3bdffdb9cf9b38b6","repo":"kubernetes/kops","slug":"converting-headers-to-json-w","errorCode":null,"errorMessage":"converting headers to json: %w","messagePattern":"converting headers to json: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"info","filePath":"pkg/bootstrap/awsbootstrap/authenticator.go","lineNumber":131,"sourceCode":"\tcredentials, err := a.credentialsProvider.Retrieve(ctx)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"getting AWS credentials: %w\", err)\n\t}\n\n\thost, err := a.getSTSHost(ctx)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"getting AWS STS url: %w\", err)\n\t}\n\tstsURL := \"https://\" + host + \"/\"\n\tregion := a.region\n\n\treq, err := signV1Request(ctx, stsURL, region, credentials, time.Now(), body)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"building (v1) signed request: %w\", err)\n\t}\n\theaders, err := json.Marshal(req.Header)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"converting headers to json: %w\", err)\n\t}\n\treturn AWSAuthenticationTokenPrefixV1 + base64.StdEncoding.EncodeToString(headers), nil\n}\n\nfunc (a *awsAuthenticator) getSTSHost(ctx context.Context) (string, error) {\n\t// An inefficient but reliable way to get the STS url\n\tpresignClient := sts.NewPresignClient(a.sts)\n\tstsRequest, err := presignClient.PresignGetCallerIdentity(ctx, &sts.GetCallerIdentityInput{})\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"building AWS STS presigned request: %w\", err)\n\t}\n\tu, err := url.Parse(stsRequest.URL)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"parsing AWS STS url: %w\", err)\n\t}\n\treturn u.Host, err\n}\n","sourceCodeStart":113,"sourceCodeEnd":149,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/bootstrap/awsbootstrap/authenticator.go#L113-L149","documentation":"createTokenV1 wraps an error from json.Marshal(req.Header) — converting the signed http.Header map into JSON before base64-encoding it into the token. http.Header is always JSON-marshalable (map[string][]string), so this error is practically unreachable and would indicate a non-standard Header type or corrupted request.","triggerScenarios":"json.Marshal(req.Header) fails in createTokenV1 after successful signing — only if req.Header contains a type that cannot serialize, which cannot happen with a standard http.Request built by signV1Request.","commonSituations":"Effectively never in production; theoretically only if signV1Request were replaced or tests injected a custom Header implementation.","solutions":["Treat as a defensive branch: if hit, re-run CreateToken; the failure is transient or environmental.","Inspect the wrapped error message; if persistent, verify you are running unmodified kOps code (no vendored patch to signV1Request).","Report a bug to kOps with the wrapped error text if it reproduces."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"token, err := auth.CreateToken(body)\nif err != nil {\n\tlog.Errorf(\"CreateToken failed: %v\", err) // unreachable branch; log and report\n}","preventionTips":["Do not patch signV1Request or the Header serialization path.","Report reproducible failures upstream to kOps."],"tags":["json","serialization","defensive","bootstrap"],"backgroundTag":"json-marshal-failed","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}