nginx proxy_pass regexp to another domain

Question

I have photoURL http://cs10821.vk.me/u712377/d_9da50e0f.jpg It is does not have header Access-Control-Allow-Origin *; I fix it with nginx. If I write

location /photo/cs10821.vk.me/u712377/d_9da50e0f.jpg {                  
    proxy_pass http://cs10821.vk.me/u712377/d_9da50e0f.jpg;             
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    add_header Access-Control-Allow-Origin *;
}

all work fine. I write http://servername.ru/photo/cs10821.vk.me/u712377/d_9da50e0f.jpg and I have my photo with header Access-Control-Allow-Origin *; But if I use regex

location ~ ^/photo/(.*)$ {      
    proxy_pass http://$1;               
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    add_header Access-Control-Allow-Origin *;
}

I have error 502. Help me please

Answer 1

Check the error log. You should have resolver defined.

Such as /etc/nginx/conf.d/resolver.conf:

resolver 8.8.8.8;