how to handle nginx reverse proxy https to http scheme redirect
Ok, I was having the same problem and after some more research and couple of trial and error attempts I figured it out.
Try adding the header X-Forwarded-Proto as in the following example,
server { server_name example.com; proxy_set_header Host $host; # You need this line proxy_set_header X-Forwarded-Proto $scheme; location ^~ /jenkins { proxy_pass http://localhost:8080/; } listen 443 ssl; ssl_certificate cert.crt; ssl_certificate_key cert.key; ssl_session_cache builtin:1000 shared:SSL:10m; ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_ciphers HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4; ssl_prefer_server_ciphers on;}
You probably need to rewrite the 302 redirect from upstream. Assuming everything else is correct, try:
proxy_redirect http:// https://;See this document for details.