{"record":{"id":"e94bff70b971f920","repo":"XTLS/Xray-core","slug":"failed-to-write-response","errorCode":null,"errorMessage":"failed to write response","messagePattern":"failed to write response","errorType":"exception","errorClass":"errors.Error","httpStatus":null,"severity":"error","filePath":"proxy/http/server.go","lineNumber":302,"sourceCode":"\t\t\tdefer response.Body.Close()\n\t\t} else {\n\t\t\terrors.LogWarningInner(ctx, err, \"failed to read response from \", request.Host)\n\t\t\tresponse = &http.Response{\n\t\t\t\tStatus:        \"Service Unavailable\",\n\t\t\t\tStatusCode:    503,\n\t\t\t\tProto:         \"HTTP/1.1\",\n\t\t\t\tProtoMajor:    1,\n\t\t\t\tProtoMinor:    1,\n\t\t\t\tHeader:        http.Header(make(map[string][]string)),\n\t\t\t\tBody:          nil,\n\t\t\t\tContentLength: 0,\n\t\t\t\tClose:         true,\n\t\t\t}\n\t\t\tresponse.Header.Set(\"Connection\", \"close\")\n\t\t\tresponse.Header.Set(\"Proxy-Connection\", \"close\")\n\t\t}\n\t\tif err := response.Write(writer); err != nil {\n\t\t\treturn errors.New(\"failed to write response\").Base(err).AtWarning()\n\t\t}\n\t\treturn nil\n\t}\n\n\tif err := task.Run(ctx, requestDone, responseDone); err != nil {\n\t\tcommon.Interrupt(link.Reader)\n\t\tcommon.Interrupt(link.Writer)\n\t\treturn errors.New(\"connection ends\").Base(err)\n\t}\n\n\treturn result\n}\n\n// Sometimes, server might send 1xx response to client\n// it should not be processed by http proxy handler, just forward it to client\nfunc readResponseAndHandle100Continue(r *bufio.Reader, req *http.Request, writer io.Writer) (*http.Response, error) {\n\t// have a little look of response\n\tpeekBytes, err := r.Peek(56)","sourceCodeStart":284,"sourceCodeEnd":320,"githubUrl":"https://github.com/XTLS/Xray-core/blob/7d214f8b094f75322fa3990f8aadad1c912f24f5/proxy/http/server.go#L284-L320","documentation":"Error \"failed to write response\" thrown in XTLS/Xray-core.","triggerScenarios":"Thrown at proxy/http/server.go:302 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"}