first commit

tools/probe429/main.go

@@ -0,0 +1,83 @@
+// 429 详情探针：打印 429 响应的全部头部 + 响应体，看清 CDN 到底怎么限的。
+//
+//	go run ./tools/probe429 -v <图片URL>
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintln(os.Stderr, "用法: go run ./tools/probe429 [-v] <图片URL>")
+		os.Exit(1)
+	}
+	url := os.Args[len(os.Args)-1]
+	verbose := false
+	for _, a := range os.Args {
+		if a == "-v" {
+			verbose = true
+		}
+	}
+
+	// 先探一张，看当前状态
+	for round := 1; round <= 3; round++ {
+		status, hdr, body, err := fullProbe(url, verbose)
+		if err != nil {
+			fmt.Printf("[第%d轮] 错误: %v\n", round, err)
+			continue
+		}
+		fmt.Printf("[第%d轮] HTTP %d\n", round, status)
+		if verbose || status == 429 {
+			for _, k := range []string{
+				"Retry-After", "X-RateLimit-Limit", "X-RateLimit-Remaining",
+				"X-RateLimit-Reset", "X-Cache", "CF-RateLimited",
+				"Server", "Content-Type", "X-Jetpack-Cache",
+			} {
+				if v := hdr.Get(k); v != "" {
+					fmt.Printf("        %s: %s\n", k, v)
+				}
+			}
+			if s := strings.TrimSpace(body); s != "" {
+				fmt.Printf("        body: %.300s\n", s)
+			}
+		}
+		if status == 200 {
+			fmt.Println("        ✓ 这次成功了")
+			break
+		}
+		if round < 3 {
+			time.Sleep(3 * time.Second)
+		}
+	}
+}
+
+func fullProbe(url string, verbose bool) (int, http.Header, string, error) {
+	tr := &http.Transport{ForceAttemptHTTP2: true}
+	defer tr.CloseIdleConnections()
+	client := &http.Client{Transport: tr, Timeout: 25 * time.Second}
+
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		return 0, nil, "", err
+	}
+	// 用我们客户端的头
+	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36")
+	req.Header.Set("Accept", "image/webp,image/*,*/*;q=0.8")
+	req.Header.Set("Referer", "https://migmg.ssuu.uk/")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return 0, nil, "", err
+	}
+	defer resp.Body.Close()
+	b, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
+
+	fmt.Printf("        Proto=%s  (2=HTTP/2, 1.1=HTTP/1.1)\n", resp.Proto)
+	return resp.StatusCode, resp.Header, string(b), nil
+}