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location / {
    proxy_pass http://backend;
    proxy_cache my_cache;
    proxy_cache_valid 200 304 12h;
    proxy_cache_valid any 5m;
    proxy_cache_key $host$scheme$request_uri;
    proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;
    proxy_cache_background_update on;
    proxy_cache_lock on;
    proxy_cache_lock_timeout 5s;
    proxy_cache_lock_age 10s;
    proxy_ignore_headers Cache-Control;
    proxy_ignore_headers Set-Cookie;
    proxy_ignore_headers Expires;
    add_header X-Proxy-Cache $upstream_cache_status;
}

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proxy_cache_background_update£ºÉèÖÃÊÇ·ñÔÚºǫ́¸üлº´æÊý¾Ý¡£

proxy_cache_lock£ºÉèÖÃÊÇ·ñÆôÓûº´æËø£¬ÒÔ×èÖ¹¶à¸öÇëÇóͬʱ¸üлº´æ¡£

proxy_ignore_headers£ºÉèÖúöÂÔµÄÏìӦͷ£¬ÕâÀïºöÂÔÁËCache-Control¡¢Set-CookieºÍExpires¡£

add_header£ºÌí¼ÓÏìӦͷ£¬ÓÃÓÚÏÔʾ»º´æÖÀÖÐ״̬¡£

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proxy_cache_path /path/to/cache levels=1:2 keys_zone=my_cache:50m inactive=24h max_size=500m;

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sudo service nginx restart

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