Configuración actual de nginx:
server { listen hidden:80; server_name dev.hidden.com; root /var/www/back/hidden-api; location / { add_header 'Access-Control-Allow-Origin' "$http_origin" always; add_header 'Access-Control-Allow-Credentials' 'true' always; add_header 'Access-Control-Allow-Headers' "Origin, X-Requested-With, Content-Type, Accept" always; proxy_pass http://localhost:8081; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } }Eso simplemente no lo intentó, pero el error sigue siendo el siguiente:
Access to XMLHttpRequest at 'http://dev.hidden.com/usr/register/do' from origin 'http://front.hidden.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.¿Puedes intentar agregar lo siguiente a tu configuración dentro del bloque de ubicación?
if ($request_method = 'OPTIONS') { add_header 'Access-Control-Allow-Origin' "$http_origin" always; add_header 'Access-Control-Allow-Credentials' 'true' always; add_header 'Access-Control-Allow-Headers' "Origin, X-Requested-With, Content-Type, Accept" always; add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS'; add_header 'Access-Control-Max-Age' 1728000; add_header 'Content-Type' 'text/plain; charset=utf-8'; add_header 'Content-Length' 0; return 204; }Consulte https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Preflighted_requests para obtener más información sobre las comprobaciones previas de CORS.