{"record":{"id":"0e5b46c9129eb223","repo":"flipped-aurora/gin-vue-admin","slug":"w-0e5b46","errorCode":null,"errorMessage":"构建上游请求地址失败: %w","messagePattern":"构建上游请求地址失败: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/mcp/http_client.go","lineNumber":171,"sourceCode":"\nfunc doUpstream[T any](ctx context.Context, method, endpoint string, query url.Values, body any) (*upstreamEnvelope[T], error) {\n\ttoken := authTokenFromContext(ctx)\n\tif token == \"\" {\n\t\treturn nil, fmt.Errorf(\"缺少MCP鉴权请求头: %s\", configuredAuthHeader())\n\t}\n\n\tendpoint = strings.TrimSpace(endpoint)\n\tif endpoint == \"\" {\n\t\treturn nil, fmt.Errorf(\"上游接口路径不能为空\")\n\t}\n\tif !strings.HasPrefix(endpoint, \"/\") {\n\t\tendpoint = \"/\" + endpoint\n\t}\n\n\tbaseURL := upstreamBaseURL()\n\trequestURL, err := url.Parse(baseURL + endpoint)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"构建上游请求地址失败: %w\", err)\n\t}\n\tif len(query) > 0 {\n\t\trequestURL.RawQuery = query.Encode()\n\t}\n\n\tvar reader io.Reader\n\tif body != nil {\n\t\tpayload, err := json.Marshal(body)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"序列化上游请求失败: %w\", err)\n\t\t}\n\t\treader = bytes.NewReader(payload)\n\t}\n\n\ttimeoutCtx, cancel := context.WithTimeout(ctx, requestTimeout())\n\tdefer cancel()\n\n\treq, err := http.NewRequestWithContext(timeoutCtx, method, requestURL.String(), reader)","sourceCodeStart":153,"sourceCodeEnd":189,"githubUrl":"https://github.com/flipped-aurora/gin-vue-admin/blob/3136500ef380842b0eb6c4daa87c3f8a47fcf9e0/server/mcp/http_client.go#L153-L189","documentation":"After joining upstreamBaseURL() with the endpoint, url.Parse failed — the combined URL is malformed. The wrap preserves the underlying url.Parse error (e.g. invalid control characters, bad scheme).","triggerScenarios":"upstreamBaseURL() from config/env contains spaces, control characters, or garbage; endpoint contains unescaped characters that form an invalid URL; base URL missing its scheme so the concatenation is unparseable in an unexpected way.","commonSituations":"Upstream base URL env var set with trailing whitespace/newline or quotes; config placeholder like \"http://<host>:<port>\" not replaced; copy-pasting a URL with invisible characters.","solutions":["Print upstreamBaseURL() and the endpoint at failure time to spot invisible characters or placeholders","Ensure the base URL includes scheme and host, e.g. http://127.0.0.1:8888, with no quotes/whitespace","Validate the base URL at startup with url.Parse and fail fast","Sanitize env/config values with strings.TrimSpace before use"],"exampleFix":"// before\nbaseURL := os.Getenv(\"MCP_UPSTREAM_BASE\") // \"  http://127.0.0.1:8888\\n\"\n// after\nbaseURL := strings.TrimSpace(os.Getenv(\"MCP_UPSTREAM_BASE\"))\nif _, err := url.Parse(baseURL); err != nil {\n\tpanic(fmt.Sprintf(\"invalid MCP_UPSTREAM_BASE: %v\", err))\n}","handlingStrategy":"validation","validationCode":"func validateBaseURL(raw string) (string, error) {\n\traw = strings.TrimSpace(raw)\n\tu, err := url.Parse(raw)\n\tif err != nil {\n\t\treturn \"\", fmt.Errorf(\"invalid upstream base URL %q: %w\", raw, err)\n\t}\n\tif u.Scheme == \"\" || u.Host == \"\" {\n\t\treturn \"\", fmt.Errorf(\"upstream base URL needs scheme and host: %q\", raw)\n\t}\n\treturn raw, nil\n}","typeGuard":null,"tryCatchPattern":"result, err := getUpstream[Data](ctx, \"/api/x\", nil)\nif err != nil {\n\tif strings.Contains(err.Error(), \"构建上游请求地址失败\") {\n\t\t// fix MCP upstream base URL configuration\n\t}\n\treturn err\n}","preventionTips":["Trim whitespace/quotes from base URL env vars before use","Validate upstreamBaseURL() at process startup and fail fast","Avoid placeholder values like http://<host>:<port> in config files","Quote env values carefully so no newlines slip in"],"tags":["url","configuration","go"],"backgroundTag":"invalid-url-configuration","analyzedSha":"3136500ef380842b0eb6c4daa87c3f8a47fcf9e0","analyzedAt":"2026-08-31T13:50:02.721Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}