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Okay, I got it. Somehow the GET part of this setting has made the problems. Don’t know why tho. Just comment it and everything worked fine:
if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
# Custom headers and headers various browsers *should* be OK with but aren't
add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content-Type' 'text/plain; charset=utf-8';
add_header 'Content-Length' 0;
return 204;
}
if ($request_method = 'POST') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
}
#if ($request_method = 'GET') {
# add_header 'Access-Control-Allow-Origin' '*';
# add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
# add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-#Modified-Since,Cache-Control,Content-Type,Range';
# add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
#}
Source:stackexchange.com