WebSocket Issue on AWS Elastic Beanstalk Using Port 80

Question

I am migrating a node.js app from Heroku to AWS Elastic Beanstalk that uses WebSockets on port 80. The WebSockets are returning a 301 error on AWS Elastic Beanstalk, but not on

Answer 1

I found part of the answer here, https://scopestar.com/blog/aws/elasticbeanstalk/websockets/2016/10/21/enable-websockets-on-elasticbeanstalk-nginx-proxy.html

I added a file in the .ebextensions folder with the following content and that fixed it for single instance environments.

container_commands:
  01_nginx_websocket_support:
    command: |
      sed -i '/\s*proxy_set_header\s*Connection/c \
              proxy_set_header Upgrade $http_upgrade;\
              proxy_set_header Connection "upgrade";\
          ' /tmp/deployment/config/#etc#nginx#conf.d#00_elastic_beanstalk_proxy.conf

To get the WebSockets to work on the load balanced, auto scaling environment I needed to do the following in addition

• Go to the EC2 Dashboard
• Find the Load Balancer that the Elastic Beanstalk project created
• Right click on the Load Balancer and click Edit listener
• Change the Load Balancer Protocol from HTTP to TCP for port 80 and save changes