400 Bad Request - request header or cookie too large

Question

I am getting a 400 Bad Request request header or cookie too large from nginx with my Rails app. Restarting the browser fixes the issue. I am only storing a string id in my

Answer 1

In my case (Cloud Foundry / NGiNX buildpack) the reason was the directive proxy_set_header Host ..., after removing this line nginx became stable:

http {
  server {
    location /your-context/ {
       # remove it: # proxy_set_header Host myapp.mycfdomain.cloud;
    }
  }
}