Chrome, Edge

ERR_EMPTY_RESPONSE

The connection opened, then the server closed it without sending anything at all.

What causes it

The application crashed part-way through the request.
A PHP fatal error or out-of-memory kill with output buffering enabled.
A proxy dropping the connection under load.

If you are the visitor

Reload once; if it persists, it is not your device.

If it is your website

Check the application error log and the system log for out-of-memory kills.
Raise memory limits if a specific heavy page triggers it.

Find out whether the site is down for everyone

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Other connection errors

ERR_CONNECTION_REFUSED DNS_PROBE_FINISHED_NXDOMAIN ERR_NAME_NOT_RESOLVED ERR_CONNECTION_TIMED_OUT ERR_SSL_PROTOCOL_ERROR NET::ERR_CERT_AUTHORITY_INVALID NET::ERR_CERT_DATE_INVALID NET::ERR_CERT_COMMON_NAME_INVALID ERR_TOO_MANY_REDIRECTS ERR_CONNECTION_RESET 503 Service Unavailable 502 Bad Gateway This site can't be reached