nginx反向代理的proxy_pass後面的url是什麼的url？以下範例中所寫的127.0.0.1，表示本機？自己代理自己？作用是什麼呢？

location / { proxy_http_version 1.1; add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"; add_header X-Frame-Options deny; add_header X-Content-Type-Options nosniff; add_header Content-Security-Policy "default-src 'none'; script-src 'unsafe-inline' 'unsafe-eval' blob: https:; img-src data: https: http://ip.qgy18.com; style-src 'unsafe-inline' https:; child-src https:; connect-src 'self' https://translate.googleapis.com; frame-src https://disqus.com https://www.slideshare.net"; add_header Public-Key-Pins 'pin-sha256="YLh1dUR9y6Kja30RrAn7JKnbQG/uEtLMkBgFF2Fuihg="; pin-sha256="aef6IF2UF6jNEwA2pNmP7kpgT6NFSdt7Tqf5HzaIGWI="; max-age=2592000; includeSubDomains'; add_header Cache-Control no-cache; proxy_ignore_headers Set-Cookie; proxy_hide_header Vary; proxy_hide_header X-Powered-By; proxy_set_header X-Via QingDao.Aliyun; proxy_set_header Connection ""; proxy_set_header Host imququ.com; proxy_set_header X-Real_IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_pass http://127.0.0.1:9095; }