WebSocket server health check with curl

Question

I am trying to implement a healthcheck for WebSocket server with curl.

curl --include --no-buffer \ --header "Connection: Upgrade" \ --header "Upgrade: websocket" \ --header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \ --header "Sec-WebSocket-Version: 13" \ http://localhost:3000

I send an HTTP request to do the handcheck, and receive an HTTP 101 as expected :

HTTP/1.1 101 Switching Protocols Upgrade: websocket Connection: Upgrade Sec-WebSocket-Accept: qGEgH3En71di5rrssAZTmtRTyFk=

My issue is that after receiving that response, curl will just hang.

Is there any way to tell curl to exit after that successful handshake?

Bertrand Martel · Accepted Answer · 2017-11-17 18:39:55Z

You can use Connection: close instead of Connection: Upgrade in order to specify that the connection should be closed after the completion of the response :

curl --include --no-buffer \ --header "Connection: close" \ --header "Upgrade: websocket" \ --header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \ --header "Sec-WebSocket-Version: 13" \ http://localhost:3000

can I translate this to be programmatically done by node http module? nodejs.org/api/http.html
would this be considered a valid way to do the same request pastebin.com/xhAqpHkH

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