Tornado app in multiple nginx locations - nginx

Question

I have 2 tornado applications and I am trying to use nginx as a proxy for them, but I need those applications to be served in the same address but different locations (Access app1 with URL http://myserver/app1, and app2 with URL http://myserver/app2).
My nginx configuration file /etc/nginx/conf.d/myserver.conf:
upstream app1 {
server 127.0.0.1:8081;
server 127.0.0.1:8082;
}
upstream app2 {
server 127.0.0.1:9081;
server 127.0.0.1:9082;
}
server {
listen 80;
access_log /var/log/nginx/myserver.access.log;
error_log /var/log/nginx/myserver.error.log;
location app1/static {
root /path/to/app1/;
if ($query_string) {
expires max;
}
}
location app2/static {
root /path/to/app2/;
if ($query_string) {
expires max;
}
}
location /app1/ {
proxy_pass_header Server;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Scheme $scheme;
proxy_pass http://app1/;
}
location /app2/ {
proxy_pass_header Server;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Scheme $scheme;
proxy_pass http://app2/;
}
}
When I access, for instance, app1 via tornado it works fine:
Via tornado: http://myserver:8081/ redirects to login http://myserver:8081/auth/login. Good.
Via nginx: http://myserver/app1 redirects to http://myserver/auth/login (it should redirect to http://myserver/app1/auth/login).
What is the correct nginx configuration to make it work?

Answer 1

This is controlled by the proxy_redirects setting. You've turned it off, so when the tornado server redirects to /auth/login that gets passed through as-is. You need to either make the tornado server aware of its urls as seen by the outside world (i.e. include /app1/ in all the routes and redirects even internally) or turn on proxy_redirects to have nginx remap them. I recommend the former, since proxy_redirects only works for redirects and you'll usually run into similar issues in other places (urls for static content, for submission, etc).