flipped-aurora/gin-vue-admin · error

创建上游请求失败: %w

Error message

创建上游请求失败: %w

What it means

http.NewRequestWithContext rejected the request construction; the error is wrapped as '创建上游请求失败'. With an already-parsed URL this is rare and usually means an invalid HTTP method or a malformed URL string after requestURL.String().

Source

Thrown at server/mcp/http_client.go:191

	if len(query) > 0 {
		requestURL.RawQuery = query.Encode()
	}

	var reader io.Reader
	if body != nil {
		payload, err := json.Marshal(body)
		if err != nil {
			return nil, fmt.Errorf("序列化上游请求失败: %w", err)
		}
		reader = bytes.NewReader(payload)
	}

	timeoutCtx, cancel := context.WithTimeout(ctx, requestTimeout())
	defer cancel()

	req, err := http.NewRequestWithContext(timeoutCtx, method, requestURL.String(), reader)
	if err != nil {
		return nil, fmt.Errorf("创建上游请求失败: %w", err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set(upstreamAuthHeader, token)
	if body != nil {
		req.Header.Set("Content-Type", "application/json")
	}
	// 链路传播:外部 AI → MCP 进程 → GVA 主服务串成同一条 trace
	logger.InjectTraceHeaders(timeoutCtx, req)

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("请求上游服务失败: %w", err)
	}
	defer resp.Body.Close()

	rawBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("读取上游响应失败: %w", err)

View on GitHub (pinned to 3136500ef3)

Solutions

1. Check the wrapped error text — it states exactly what NewRequestWithContext rejected
2. Verify the HTTP method is a valid token (GET/POST/DELETE) and never empty
3. Print requestURL.String() before creating the request to inspect the final URL
4. Restrict methods to the getUpstream/postUpstream/deleteUpstream wrappers instead of calling doUpstream with arbitrary strings

Example fix

// before
method := "" // set somewhere upstream
req, err := http.NewRequestWithContext(timeoutCtx, method, requestURL.String(), reader)
// after
if method == "" {
	method = http.MethodGet
}
req, err := http.NewRequestWithContext(timeoutCtx, method, requestURL.String(), reader)

func validMethod(m string) bool {
	switch m {
	case http.MethodGet, http.MethodPost, http.MethodDelete, http.MethodPut:
		return true
	}
	return false
}

result, err := doUpstream[Data](ctx, method, endpoint, nil, nil)
if err != nil {
	if strings.Contains(err.Error(), "创建上游请求失败") {
		// check method string and final URL before retrying
	}
	return err
}

When it happens

Trigger: Method variable is empty or contains invalid characters; the parsed URL became invalid when re-serialized; nil/incorrect reader combination; context already canceled does not fail here but at Do.

Common situations: Refactor left method as "" or lowercase typos passed through; endpoint injection produced a URL with spaces; building requests with a custom method string from user input.

Related errors

• result.Msg
• httpUrl 必须是合法的 http/https 地址
• 任务执行超时
• function file.Open() Failed, err:
• 调用上游大模型服务失败: %w

AI-assisted analysis of flipped-aurora/gin-vue-admin@3136500ef3 (2026-08-31). Data as JSON: /api/errors/8e1ec1641970a447. Report an issue: GitHub.