Nginx配置屏蔽PC端放行爬虫代码

# === 屏蔽PC端（修复版）===
set $allow_request 1;

# --- 新增：放行主流搜索引擎爬虫（写在最前面）---
# Google 爬虫（包括PC和移动版）
if ($http_user_agent ~* "Googlebot") {
    set $allow_request 1;
}
# 百度爬虫
if ($http_user_agent ~* "Baiduspider") {
    set $allow_request 1;
}
# 必应爬虫
if ($http_user_agent ~* "bingbot") {
    set $allow_request 1;
}
# 360爬虫
if ($http_user_agent ~* "360Spider") {
    set $allow_request 1;
}
# 搜狗爬虫
if ($http_user_agent ~* "Sogou") {
    set $allow_request 1;
}
# 神马爬虫
if ($http_user_agent ~* "YisouSpider") {
    set $allow_request 1;
}
# 头条爬虫
if ($http_user_agent ~* "Bytespider") {
    set $allow_request 1;
}
# --- 爬虫白名单结束 ---

# 移动设备检测
if ($http_user_agent ~* "(Mobile|Android|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini|webOS)") {
    set $allow_request 1;
}

if ($http_user_agent !~* "(Mobile|Android|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini|webOS|Version/\d+\.\d+.*Safari/)") {
    set $allow_request 0;
}

# 排除SSL验证路径
if ($uri ~ ^/\.well-known/acme-challenge/) {
    set $allow_request 1;
}

# 如果不是移动设备且不在排除路径中，返回404
if ($allow_request = 0) {
    return 444;
}