{"record":{"id":"a296f6bac8068c52","repo":"jeessy2/ddns-go","slug":"v-a296f6","errorCode":null,"errorMessage":"请求失败: %v","messagePattern":"请求失败: %v","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"dns/nowcn.go","lineNumber":261,"sourceCode":"\n\t// 构造完整URL\n\tbaseURL := \"https://api.now.cn\"\n\tfullURL := baseURL + apiPath + \"?\" + queryString\n\n\t// 创建HTTP请求\n\treq, err := http.NewRequest(method, fullURL, nil)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"创建请求失败: %v\", err)\n\t}\n\n\t// 设置请求头\n\treq.Header.Set(\"Accept\", \"application/json\")\n\n\t// 发送请求\n\tclient := t.httpClient\n\tresp, err := client.Do(req)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"请求失败: %v\", err)\n\t}\n\tdefer resp.Body.Close()\n\n\t// 读取响应\n\tbody, err := io.ReadAll(resp.Body)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"读取响应失败: %v\", err)\n\t}\n\n\t// 检查HTTP状态码\n\tif resp.StatusCode != http.StatusOK {\n\t\treturn nil, fmt.Errorf(\"API请求失败，状态码: %d, 响应: %s\", resp.StatusCode, string(body))\n\t}\n\n\treturn body, nil\n}\n","sourceCodeStart":243,"sourceCodeEnd":278,"githubUrl":"https://github.com/jeessy2/ddns-go/blob/5874c2e6667c69357ab95079421131104bd3fcae/dns/nowcn.go#L243-L278","documentation":"Nowcn.request executes the prepared HTTP request with the shared client; a transport-level failure (connection refused, DNS failure, timeout, TLS error) is wrapped as '请求失败' (request failed). The provider response was never received.","triggerScenarios":"client.Do(req) returns err — network unreachable, DNS resolution failure for api.now.cn, connection timeout/reset, TLS handshake failure, or proxy misconfiguration.","commonSituations":"No internet/firewall blocking api.now.cn, local DNS issues, very short client timeout on t.httpClient, corporate proxy requiring configuration, transient provider outage.","solutions":["Check basic connectivity to api.now.cn (curl/ping) and DNS resolution","Increase the timeout on t.httpClient if requests are timing out","Retry with backoff for transient network errors","Verify proxy environment variables/corporate proxy settings","Check provider status for an outage"],"exampleFix":"// before\nresp, err := client.Do(req)\nif err != nil {\n    return nil, fmt.Errorf(\"请求失败: %v\", err)\n}\n// after\nvar netErr net.Error\nresp, err := client.Do(req)\nif err != nil {\n    if errors.As(err, &netErr) && netErr.Timeout() {\n        return nil, fmt.Errorf(\"请求超时: %w\", err) // retryable\n    }\n    return nil, fmt.Errorf(\"请求失败: %w\", err)\n}","handlingStrategy":"retry","validationCode":"// Go: pre-flight reachability check\nconn, err := net.DialTimeout(\"tcp\", \"api.now.cn:443\", 5*time.Second)\nif err != nil { return fmt.Errorf(\"api.now.cn unreachable: %w\", err) }\nconn.Close()","typeGuard":null,"tryCatchPattern":"body, err := nowcnClient.request(apiPath, params, method)\nif err != nil {\n    var netErr net.Error\n    if errors.As(err, &netErr) && netErr.Timeout() {\n        time.Sleep(time.Second)\n        body, err = nowcnClient.request(apiPath, params, method) // single retry\n    }\n    if err != nil { return err }\n}","preventionTips":["Set a sane timeout on t.httpClient (e.g. 10-30s)","Implement exponential backoff for transient transport errors","Monitor outbound connectivity/DNS in the deployment environment","Configure proxy settings explicitly in containerized/CI environments"],"tags":["dns","network","http","timeout"],"backgroundTag":"connection-refused","analyzedSha":"5874c2e6667c69357ab95079421131104bd3fcae","analyzedAt":"2026-09-03T15:41:16.799Z","contentChangedAt":"2026-09-03T15:41:16.799Z","schemaVersion":2},"datasetVersion":"2026-09-11T00:17:11.886Z"}