upstream fsapiBackend { server 10.20.1.72:8082; server 10.20.1.72:8082 max_fails=10 fail_timeout=30s backup; } upstream fsbulkapiBackend { server 10.20.1.72:8082; } upstream ssapiBackend { server 10.20.1.72:8084; } upstream csapiBackend { server 10.20.1.72:9095; } upstream activityBackend { server 10.20.1.72:8094; } server { listen 80; listen 443 ssl http2; server_name mxapi.hckcooler.com; ssl_certificate /usr/local/openresty/nginx/ssl/mxapi.hckcooler.com/mxapi.hckcooler.com_chain.crt; ssl_certificate_key /usr/local/openresty/nginx/ssl/mxapi.hckcooler.com/mxapi.hckcooler.com_key.key; ssl_session_timeout 5m; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_ciphers EECDH+ECDSA+AES128:EECDH+aRSA+AES128:RSA+AES128:!aNULL:!MD5:!RC4; ssl_prefer_server_ciphers on; ssl_stapling on; ssl_stapling_verify on; ssl_trusted_certificate /usr/local/openresty/nginx/ssl/mxapi.hckcooler.com/mxapi.hckcooler.com_chain.crt; location /fs/ { proxy_pass http://fsapiBackend/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_http_version 1.1; proxy_set_header Connection ""; } location =/fs/v2/mails/deliver { proxy_pass http://fsapiBackend/v2/mails/deliver; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_http_version 1.1; proxy_set_header Connection ""; access_by_lua_file ./app/mailLimit.lua; } location /fsbulk/ { proxy_pass http://fsbulkapiBackend/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_http_version 1.1; proxy_set_header Connection ""; } location /ss/ { proxy_pass http://ssapiBackend/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_http_version 1.1; proxy_set_header Connection ""; } location /approval/ { proxy_pass http://approvalapiBackend/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_http_version 1.1; proxy_set_header Connection ""; } location /job/ { proxy_pass http://jobapiBackend/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_http_version 1.1; proxy_set_header Connection ""; } }中，mxapi.hckcooler.com代理的是哪个服务

在给出的 Nginx 配置中，`mxapi.hckcooler.com` 代理了 `fsapiBackend` 这个服务。可以看到以下配置：

location /fs/ {
    proxy_pass http://fsapiBackend/;
    ...
}
location =/fs/v2/mails/deliver {
    proxy_pass http://fsapiBackend/v2/mails/deliver;
    ...
}

这些配置指定了请求路径以及对应的代理后端，都是指向 `fsapiBackend`。因此，`mxapi.hckcooler.com` 代理的是 `fsapiBackend` 服务。