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Forked from Stanback/nginx.conf
Created February 28, 2018 10:45
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Example Nginx configuration for adding cross-origin resource sharing (CORS) support to reverse proxied APIs
# CORS header support
# One way to use this is by placing it into a file called "cors_support"
# under your Nginx configuration directory and placing the following
# statement inside your **location** block(s):
# include cors_support;
# As of Nginx 1.7.5, add_header supports an "always" parameter which
# allows CORS to work if the backend returns 4xx or 5xx status code.
# For more information on CORS, please see:
# Forked from this Gist:
set $cors '';
if ($http_origin ~ '^https?://(localhost|www\.yourdomain\.com|www\.yourotherdomain\.com)') {
set $cors 'true';
if ($cors = 'true') {
add_header 'Access-Control-Allow-Origin' "$http_origin" always;
add_header 'Access-Control-Allow-Credentials' 'true' always;
add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
add_header 'Access-Control-Allow-Headers' 'Accept,Authorization,Cache-Control,Content-Type,DNT,If-Modified-Since,Keep-Alive,Origin,User-Agent,X-Requested-With' always;
# required to be able to read Authorization header in frontend
#add_header 'Access-Control-Expose-Headers' 'Authorization' always;
if ($request_method = 'OPTIONS') {
# Tell client that this pre-flight info is valid for 20 days
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'text/plain charset=UTF-8';
add_header 'Content-Length' 0;
return 204;
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