Nginx subdomain + subfolder to subfolder

Question

The goal is to load pages from blog.example.com/blog using example.com/blog and all the posts, categories and authors.

location /blog(/.*)$ {
  rewrite ^ $1 break;

  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_pass https://blog.example.com/blog$1;
  proxy_ssl_server_name on;
}

Gives a 500 error

Answer 1

If the URI is passing through unchanged (e.g. /blog/foo -> /blog/foo) then you do not need a rewrite and you do not need the optional URI part on the proxy_pass statement. See this document for details.

The syntax of your location statement is wrong. You are using a regular expression without the appropriate operator ~ or ~*. However, you do not need to use a regular expression to match all URIs that begin with /blog. See this document for details.

For example:

location ^~ /blog {
    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_pass https://blog.example.com;
    proxy_ssl_server_name on;
}