一、根据url中的参数来确定缓存的key
set_by_lua_block $dataArg {
local enc = ngx.req.get_uri_args()["enc"]
local key = ngx.req.get_uri_args()["key"]
local name = ngx.req.get_uri_args()["name"]
local str = tostring(enc)..tostring(key)..tostring(name)
return str
}
proxy_cache_key $host$uri$dataArg;
二、根据源站传过来的跨域头做判断
set $cors_origin "*";
if ($http_origin != ""){
set $cors_origin $http_origin;
}
more_set_headers "Access-Control-Allow-Origin:$cors_origin"；
三、根据不同的运营商走不同的upstream
1、下层传递一个请求头：
location / {
proxy_buffer_size 128k;
proxy_buffers 32 32k;
proxy_busy_buffers_size 128k;
proxy_set_header Host $host;
proxy_set_header CDN ctyun;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header isp cm; #传递一个请求头为cm（移动）
add_header Powered-By-ctcdn "$server_addr";
proxy_cache $cache_store;
proxy_pass $scheme://test-upstream_$scheme$server_port;
}
2、上层做判断
server {
listen 80;
server_name www.test.com;
resolver 8.8.8.8 114.114.114.114;
underscores_in_headers on; #nginx开启客户读取自定义头部的值
error_log /data/log/nginx/error.log;
access_log /data/log/nginx/access.log nginxlog;
location / {
proxy_buffer_size 128k;
proxy_buffers 32 32k;
proxy_busy_buffers_size 128k;
proxy_set_header Host $host;
proxy_set_header CDN test;
add_header Powered "$server_addr";
proxy_cache $cache_store;
##此处即下层如果有移动联通电信设备；在上层需要移动回移动的upstream；联通回联通的upstream；电信回电信的upstream；
if ($http_isp = "ct") {
proxy_pass $scheme://test-ct_$scheme$server_port;
}
if ($http_isp = "cn") {
proxy_pass $scheme://test-cn_$scheme$server_port;
}
if ($http_isp = "cm") {
proxy_pass $scheme://test-cm_$scheme$server_port;
}
}
3、上层upstream配置
upstream test-cm_http80 {
server 1.1.1.1:80;
}
upstream test-cn_http80 {
server 2.2.2.2:80;
}
upstream test-ct_http80 {
server 3.3.3.3:80;
}
原文地址：https://www.cnblogs.com/zhangzhide/p/12359740.html