Jenkins proxy through nginx, source: https://wiki.jenkins-ci.org/display/JENKINS/Jenkins+behind+an+NGinX+reverse+proxy

jenkins

server {
        listen 80;
        server_name jenkins.domain.tld;

        location / {
                proxy_pass              http://localhost:8080;
                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_connect_timeout   150;
                proxy_send_timeout      100;
                proxy_read_timeout      100;
                proxy_buffers           4 32k;
                client_max_body_size    8m;
                client_body_buffer_size 128k;
        }
}