{"record":{"id":"191fd44993813137","repo":"go-kratos/kratos","slug":"metadata-appendtoclientcontext-got-an-odd-number","errorCode":null,"errorMessage":"metadata: AppendToClientContext got an odd number of input pairs for metadata: %d","messagePattern":"metadata: AppendToClientContext got an odd number of input pairs for metadata: (.+?)","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"metadata/metadata.go","lineNumber":108,"sourceCode":"\ntype clientMetadataKey struct{}\n\n// NewClientContext creates a new context with client md attached.\nfunc NewClientContext(ctx context.Context, md Metadata) context.Context {\n\treturn context.WithValue(ctx, clientMetadataKey{}, md)\n}\n\n// FromClientContext returns the client metadata in ctx if it exists.\nfunc FromClientContext(ctx context.Context) (Metadata, bool) {\n\tmd, ok := ctx.Value(clientMetadataKey{}).(Metadata)\n\treturn md, ok\n}\n\n// AppendToClientContext returns a new context with the provided kv merged\n// with any existing metadata in the context.\nfunc AppendToClientContext(ctx context.Context, kv ...string) context.Context {\n\tif len(kv)%2 == 1 {\n\t\tpanic(fmt.Sprintf(\"metadata: AppendToClientContext got an odd number of input pairs for metadata: %d\", len(kv)))\n\t}\n\tmd, _ := FromClientContext(ctx)\n\tmd = md.Clone()\n\tfor i := 0; i < len(kv); i += 2 {\n\t\tmd.Set(kv[i], kv[i+1])\n\t}\n\treturn NewClientContext(ctx, md)\n}\n\n// MergeToClientContext merge new metadata into ctx.\nfunc MergeToClientContext(ctx context.Context, cmd Metadata) context.Context {\n\tmd, _ := FromClientContext(ctx)\n\tmd = md.Clone()\n\tfor k, v := range cmd {\n\t\tmd[k] = v\n\t}\n\treturn NewClientContext(ctx, md)\n}","sourceCodeStart":90,"sourceCodeEnd":126,"githubUrl":"https://github.com/go-kratos/kratos/blob/668db92c2c001e9552594ba5a8aede8456af6d7e/metadata/metadata.go#L90-L126","documentation":"Error \"metadata: AppendToClientContext got an odd number of input pairs for metadata: %d\" thrown in go-kratos/kratos.","triggerScenarios":"Thrown at metadata/metadata.go:108 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":"668db92c2c001e9552594ba5a8aede8456af6d7e","analyzedAt":"2026-08-16T02:07:20.704Z","schemaVersion":2},"datasetVersion":"2026-08-16T03:17:38.424Z"}