a.com是要被反代理的域名。b.com是当前反代理域名

下面是b.com反代理配置文件

        location  ~* \.(gif|png|jpg|jpeg|css|js|woff|woff2)$ {
			proxy_pass https://www.liyuxiangxs.cc;
			proxy_set_header Host www.liyuxiangxs.cc;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
			proxy_set_header REMOTE-HOST $remote_addr;
			expires 12h;
		}
        location / {
            proxy_set_header X-Proxy-Request true;
			proxy_pass https://www.a.com;
			proxy_set_header Host www.a.com;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
			proxy_set_header REMOTE-HOST $remote_addr;
			add_header X-Cache $upstream_cache_status;
			proxy_set_header Accept-Encoding "";
			sub_filter "a.com" "b.com";
			sub_filter_once off;
			add_header Cache-Control no-cache;
		}
		location ~ ^/(.*)/$ {
        rewrite ^/(.*)/$ https://www.a.com/$1/ permanent;
        }

a.com配置文件

        location / {
        if ($http_x_proxy_request != "true") {
            #return 301 https://www.b.com$request_uri; #全站301到 b
            rewrite ^/(.*)/([0-9]+)\.html$ https://www.b.com/$1/$2.html permanent;  #301跳转到指定目录地址
            }
        }