fish2018/pansou · error

请求失败

Error message

请求失败: %w

What it means

pan666's fetchPage returns this when client.Do(req) fails on the final retry attempt (i == p.retries). Earlier failures sleep 500ms and retry; once retries are exhausted the transport error (DNS, timeout, connection refused, TLS) is wrapped and returned. The req object is reused across attempts.

Solutions

  1. Inspect the wrapped transport error to identify DNS vs timeout vs TLS
  2. curl the same URL from the host to confirm reachability
  3. Increase the http.Client timeout if deadline exceeded
  4. If the host blocks spoofed headers, stop sending the random X-Forwarded-For header

Example fix

// before
resp, err = client.Do(req)
if err != nil {
    if i == p.retries { return nil, false, fmt.Errorf("请求失败: %w", err) }
// after
resp, err = client.Do(req)
if err != nil {
    if i == p.retries { return nil, false, fmt.Errorf("请求失败 after %d tries: %w", p.retries+1, err) }
Defensive patterns

Strategy: retry

Validate before calling

func pan666Reachable() error {
    c, err := net.DialTimeout("tcp", "pan666.example:443", 3*time.Second)
    if err != nil { return err }
    c.Close()
    return nil
}

Try / catch

if err != nil {
    var netErr net.Error
    if errors.As(err, &netErr) && netErr.Timeout() {
        client.Timeout = 30 * time.Second // retry with longer timeout
    }
    return err
}

Prevention

When it happens

Trigger: client.Do returns err on every attempt of the retry loop: unreachable host, DNS failure, TLS handshake error, context deadline exceeded, or connection reset before any response.

Common situations: pan666 API domain blocked or DNS-poisoned in the region; no outbound network in the deployment environment; server drops requests with the spoofed X-Forwarded-For header; client timeout too short for a slow upstream.

Understand the failure class

Background: 'Something went wrong' / 'Request failed (500)' / 'HTTP error! status: 404' — what failed HTTP requests actually mean and how to find the real cause — this error's family across 28 libraries.

Related errors

AI-assisted analysis of fish2018/pansou@beaa561337 (2026-09-07). Data as JSON: /api/errors/ecdb3f840f3bbd14. Report an issue: GitHub.

Appendix: source

Thrown at plugin/pan666/pan666.go:207

	req.Header.Set("User-Agent", getRandomUA())
	req.Header.Set("X-Forwarded-For", generateRandomIP())
	req.Header.Set("Accept", "application/json, text/plain, */*")
	req.Header.Set("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8")
	req.Header.Set("Connection", "keep-alive")
	req.Header.Set("Sec-Fetch-Dest", "empty")
	req.Header.Set("Sec-Fetch-Mode", "cors")
	req.Header.Set("Sec-Fetch-Site", "same-origin")
	
	var resp *http.Response
	var responseBody []byte
	
	// 重试逻辑
	for i := 0; i <= p.retries; i++ {
		// 发送请求
		resp, err = client.Do(req)
		if err != nil {
			if i == p.retries {
				return nil, false, fmt.Errorf("请求失败: %w", err)
			}
			time.Sleep(500 * time.Millisecond)
			continue
		}
		
		defer resp.Body.Close()
		
		// 读取响应体
		responseBody, err = io.ReadAll(resp.Body)
		if err != nil {
			if i == p.retries {
				return nil, false, fmt.Errorf("读取响应失败: %w", err)
			}
			time.Sleep(500 * time.Millisecond)
			continue
		}
		
		// 状态码检查

View on GitHub (pinned to beaa561337)