{"record":{"id":"d2ee7387590125f2","repo":"XTLS/Xray-core","slug":"failed-to-read-request-version","errorCode":null,"errorMessage":"failed to read request version","messagePattern":"failed to read request version","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"proxy/vless/encoding/encoding.go","lineNumber":74,"sourceCode":"\tif _, err := writer.Write(buffer.Bytes()); err != nil {\n\t\treturn errors.New(\"failed to write request header\").Base(err)\n\t}\n\n\treturn nil\n}\n\n// DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream.\nfunc DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validator vless.Validator) ([]byte, *protocol.RequestHeader, *Addons, bool, error) {\n\tbuffer := buf.StackNew()\n\tdefer buffer.Release()\n\n\trequest := new(protocol.RequestHeader)\n\n\tif isfb {\n\t\trequest.Version = first.Byte(0)\n\t} else {\n\t\tif _, err := buffer.ReadFullFrom(reader, 1); err != nil {\n\t\t\treturn nil, nil, nil, false, errors.New(\"failed to read request version\").Base(err)\n\t\t}\n\t\trequest.Version = buffer.Byte(0)\n\t}\n\n\tswitch request.Version {\n\tcase 0:\n\n\t\tvar id [16]byte\n\n\t\tif isfb {\n\t\t\tcopy(id[:], first.BytesRange(1, 17))\n\t\t} else {\n\t\t\tbuffer.Clear()\n\t\t\tif _, err := buffer.ReadFullFrom(reader, 16); err != nil {\n\t\t\t\treturn nil, nil, nil, false, errors.New(\"failed to read request user id\").Base(err)\n\t\t\t}\n\t\t\tcopy(id[:], buffer.Bytes())\n\t\t}","sourceCodeStart":56,"sourceCodeEnd":92,"githubUrl":"https://github.com/XTLS/Xray-core/blob/7d214f8b094f75322fa3990f8aadad1c912f24f5/proxy/vless/encoding/encoding.go#L56-L92","documentation":"Error \"failed to read request version\" thrown in XTLS/Xray-core.","triggerScenarios":"Thrown at proxy/vless/encoding/encoding.go:74 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":"7d214f8b094f75322fa3990f8aadad1c912f24f5","analyzedAt":"2026-08-15T14:26:24.325Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}