This problem occurs when nginx sets ssl proxy. . .

Question

This is what I set:

upstream for_ssl {
server 127.0.0.1:1234;
}
proxy_pass http :// for_ssl;

The following is the error:

400 Bad Request
Sec-WebSocket-Key not found.
This is a WebSocket service and can not be accessed via HTTP.

Please give me some advice. .

Answer 1

nginx has the concept of protocol upgrade when acting as a proxy for long connections
With this code, there will be no problem and protocol upgrade is allowed

proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";