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Nginx代理缓存可显著提升网站访问速度，优化用户体验。通过配置Nginx代理缓存，可缓存静态资源，减少服务器压力。当需要更新内容时，可执行Nginx代理缓存清空操作，确保用户获取最新数据。
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随着互联网的快速发展，用户对网站访问速度的要求越来越高，为了提升用户体验，减少服务器压力，许多网站采用了代理缓存技术，本文将详细介绍Nginx代理缓存的概念、原理及其在网站加速中的应用。
Nginx代理缓存概述
1、Nginx简介
Nginx（发音为“Engine-X”）是一款高性能的HTTP和反向代理服务器，广泛应用于Web服务器、负载均衡和反向代理等领域，Nginx具有高性能、低资源消耗、稳定性强等特点，是目前最受欢迎的Web服务器之一。
2、代理缓存概念
代理缓存是指将用户请求的网页内容存储在代理服务器上，当其他用户再次请求相同的网页时，代理服务器可以直接从缓存中返回内容，从而减少服务器压力，提高访问速度。
Nginx代理缓存原理
1、工作流程
（1）用户发起请求，请求经过Nginx代理服务器。
（2）Nginx代理服务器收到请求后，首先检查缓存中是否有相应的网页内容。
（3）如果缓存中有，则直接返回缓存内容给用户。
（4）如果缓存中没有，则向原始服务器发送请求，获取网页内容。
（5）原始服务器返回内容后，Nginx代理服务器将内容存储到缓存中，并返回给用户。
2、缓存策略
Nginx代理缓存支持多种缓存策略，如：
（1）LRU（Least Recently Used）：最近最少使用策略，优先淘汰长时间未被访问的缓存内容。
（2）LFU（Least Frequently Used）：最少访问次数策略，优先淘汰访问次数较少的缓存内容。
（3）FIFO（First In First Out）：先进先出策略，按照缓存内容的存储顺序淘汰。
Nginx代理缓存配置
1、安装Nginx
需要在服务器上安装Nginx，以下为安装命令（以Ubuntu为例）：
sudo apt update sudo apt install nginx
2、配置Nginx代理缓存
编辑Nginx配置文件（默认路径为：/etc/nginx/nginx.conf），在http模块中添加以下配置：
http {
...
proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=my_cache:10m max_size=10g inactive=60m use_temp_path=off;
server {
...
location / {
proxy_cache my_cache;
proxy_cache_valid 200 302 10m;
proxy_cache_valid 404 1m;
proxy_cache_min_uses 3;
proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
proxy_cache_lock on;
proxy_cache_revalidate on;
proxy_cache_update on;
proxy_cache_ignore_headers "Set-Cookie";
proxy_cache_bypass $http_upgrade;
proxy_cache_bypass $cookie_nocache;
proxy_cache_bypass $arg_nocache;
proxy_cache_bypass $http_pragma;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache_bypass $httpAcceptLanguage;
proxy_cache_bypass $httpAcceptEncoding;
proxy_cache_bypass $httpAcceptCharset;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache_bypass $httpAcceptLanguage;
proxy_cache_bypass $httpAcceptEncoding;
proxy_cache_bypass $httpAcceptCharset;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache_bypass $httpAcceptLanguage;
proxy_cache_bypass $httpAcceptEncoding;
proxy_cache_bypass $httpAcceptCharset;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache_bypass $httpAcceptLanguage;
proxy_cache_bypass $httpAcceptEncoding;
proxy_cache_bypass $httpAcceptCharset;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache_bypass $httpAcceptLanguage;
proxy_cache_bypass $httpAcceptEncoding;
proxy_cache_bypass $httpAcceptCharset;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache_bypass $httpAcceptLanguage;
proxy_cache_bypass $httpAcceptEncoding;
proxy_cache_bypass $httpAcceptCharset;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache_bypass $httpAcceptLanguage;
proxy_cache_bypass $httpAcceptEncoding;
proxy_cache_bypass $httpAcceptCharset;
proxy_cache_bypass $httpCookie;
proxy_cache_bypass $httpAuthorization;
proxy_cache_bypass $httpXForwardedFor;
proxy_cache_bypass $httpXRealIP;
proxy_cache_bypass $httpXForwardedProto;
proxy_cache_bypass $httpXForwardedHost;
proxy_cache_bypass $httpConnection;
proxy_cache_bypass $httpIfModifiedSince;
proxy_cache_bypass $httpCacheControl;
proxy_cache_bypass $httpPragma;
proxy_cache_bypass $httpRange;
proxy_cache_bypass $httpReferer;
proxy_cache_bypass $httpUserAgent;
proxy_cache_bypass $httpAccept;
proxy_cache
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Nginx代理缓存：nginx代理缓存清空
