文章转自：https://www.hcyacg.com/tutorial/pixiv-nginx-cf.html，版权属于：牧瀬くりす

nginx反向代理配置文件：

proxy_cache_path /path/to/cache levels=1:2 keys_zone=pximg:10m max_size=10g inactive=7d use_temp_path=off;

    server {
        listen 443 ssl http2;

        ssl_certificate /path/to/ssl_certificate.crt;
        ssl_certificate_key /path/to/ssl_certificate.key;

        server_name i.pixiv.cat;
        access_log off;

        location / {
        proxy_cache pximg;
        proxy_pass https://i.pximg.net;
        proxy_cache_revalidate on;
        proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
        proxy_cache_lock on;
        add_header X-Cache-Status $upstream_cache_status;
        proxy_set_header Host i.pximg.net;
        proxy_set_header Referer "https://www.pixiv.net/";

        proxy_cache_valid 200 7d;
        proxy_cache_valid 404 5m;
     }
    }

如果想使用Cloudflare的Cloudflare Workers 反向代理，则配置如下（不过现在改规则后好像不可用）：

    addEventListener("fetch", event => {
      let url = new URL(event.request.url);
      url.hostname = "i.pximg.net";

      let request = new Request(url, event.request);
      event.respondWith(
        fetch(request, {
          headers: {
            'Referer': 'https://www.pixiv.net/',
            'User-Agent': 'Cloudflare Workers'
          }
        })
      );
    });