nginx-s3-proxy-headers.conf

add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Credentials' 'true';
add_header 'Access-Control-Allow-Methods' 'GET';
add_header 'Access-Control-Allow-Headers' 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
add_header 'X-Content-Type-Options' 'nosniff';
add_header 'Content-Security-Policy' "frame-ancestors 'self'";
add_header 'X-Content-Security-Policy' "frame-ancestors 'self'";
add_header 'X-XSS-Protection' '1; mode=block';

proxy_set_header       Host zooniverse-static.s3-website-us-east-1.amazonaws.com;
proxy_redirect         /$host/ /;
proxy_cache            STATIC;
proxy_cache_valid      200  1d;
proxy_cache_use_stale  error timeout invalid_header updating
            http_500 http_502 http_503 http_504;
proxy_hide_header Access-Control-Allow-Origin;
proxy_hide_header Access-Control-Allow-Credentials;
proxy_hide_header Access-Control-Allow-Methods;
proxy_hide_header Access-Control-Allow-Headers;