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Patches AWS Elastic Beanstalk's default nginx configuration to support websockets, for use with an Application Load Balancer.
container_commands:
enable_websockets:
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
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