Nginx反代m3u8资源加速HLS流媒体
现在很多直播源采用HLS流媒体传输协议，只需获得m3u8链接就可以在浏览器上播放，使用简单设备兼容性好。平时有些小众源速度跟不上卡顿，于是研究了下如何反代加速。起初在Github上找现成解决方案，不过类似项目很少且长时间没更新，测试用不了。索性试试Nginx反代，最终弄了个简单版。
反代方法
1. 安装Nginx和确保有http_sub_module替换模块。
2. 编辑Nginx虚拟机配置文件，加入反代规则。
# 适用任何符合指定后缀的请求
location ~* \.(m3u8|ts|aac)$ {
proxy_cache off; # 禁用代理缓存
expires -1; # 禁用页面缓存
proxy_pass http://example.com; # 反代目标 URL
sub_filter 'http://example.com/' 'http://$host/'; # 替换 m3u8 文件里的资源链接
sub_filter_last_modified off; # 删除原始响应里的浏览器缓存值
sub_filter_once off; # 替换所有匹配内容
sub_filter_types *; # 匹配任何 MIME 类型
}
3. 保存后运行nginx -t命令检查语法是否有问题，避免添加到错误位置。
4. systemctl restart nginx重启Nginx服务生效。之后就可以通过反代访问了。
例如原链接是http://example.com/hls/skynews/playlist.m3u8，将域名改为你自己的，其它不变。
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