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# 静态默认图
    location /static/ {
        alias /xxxx/;
        expires 30d;
        access_log off;
        error_log  off;
    }

    # 主入口：拦截任何 default=http... 或 default=https%3A%2F%2F…  
    location ^~ /avatar/ {
        resolver 8.8.8.8 1.1.1.1 valid=300s;

        # 如果用户给了 default=http 或 default=https%3A%2F%2F，直接返回本地默认图
        if ($args ~* "(^|&)(default=https?://|default=https%3A%2F%2F)") {
            rewrite ^ /static/default.jpg last;
        }

        # —— 下面保持原有代理 & fallback 逻辑 —— 
        proxy_pass https://secure.gravatar.com$uri$is_args$args;
        proxy_ssl_server_name on;
        proxy_set_header Host            secure.gravatar.com;
        proxy_set_header X-Real-IP       $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_cache          cache_one;
        proxy_cache_key      $host$uri$is_args$args;
        proxy_cache_valid    200 304 301 302 43200m;
        proxy_ignore_headers Set-Cookie Cache-Control Expires;
        add_header X-Cache   $upstream_cache_status;

        proxy_intercept_errors on;
        error_page 403 444 502 504 404 = @fallback1;
    }

    location @fallback1 {
        proxy_pass https://gravatar.loli.net$uri$is_args$args;
        proxy_ssl_server_name on;
        proxy_set_header Host            gravatar.loli.net;
        proxy_set_header X-Real-IP       $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_cache          cache_one;
        proxy_cache_key      $host$uri$is_args$args;
        proxy_cache_valid    200 304 301 302 43200m;
        proxy_ignore_headers Set-Cookie Cache-Control Expires;
        add_header X-Cache   $upstream_cache_status;

        proxy_intercept_errors on;
        error_page 403 444 502 504 404 = @fallback2;
    }

    location @fallback2 {
        proxy_pass https://cn.gravatar.com$uri$is_args$args;
        proxy_ssl_server_name on;
        proxy_set_header Host            cn.gravatar.com;
        proxy_set_header X-Real-IP       $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_cache          cache_one;
        proxy_cache_key      $host$uri$is_args$args;
        proxy_cache_valid    200 304 301 302 43200m;
        proxy_ignore_headers Set-Cookie Cache-Control Expires;
        add_header X-Cache   $upstream_cache_status;

        proxy_intercept_errors on;
        error_page 403 444 502 504 404 = @fallback3;
    }

    location @fallback3 {
        proxy_pass https://cdn.v2ex.com/gravatar$uri$is_args$args;
        proxy_ssl_server_name on;
        proxy_set_header Host            cdn.v2ex.com;
        proxy_set_header X-Real-IP       $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_cache          cache_one;
        proxy_cache_key      $host$uri$is_args$args;
        proxy_cache_valid    200 304 301 302 43200m;
        proxy_ignore_headers Set-Cookie Cache-Control Expires;
        add_header X-Cache   $upstream_cache_status;

        # 最终失败，直接落到本地默认图
        proxy_intercept_errors on;
        error_page 403 444 502 504 404 = /static/default.jpg;
    }

    # 拒绝其它一切路径
    location / { return 403; }