WebSocket client header SecWebSocketKey should be 16-bytes

[rogro82]

I am having issues connecting to some websocket servers using the websocket client.

After investigation it turned out to be a handshake issue where the server-side expected a 16-byte base64 encoded key, but the current client implementation creates a nonce of 24 bytes.

ktor/ktor-client/ktor-client-features/ktor-client-websocket/jvm/src/io/ktor/client/features/websocket/WebSocketContent.kt

Line 10 in 69732c0

private const val NONCE_SIZE = 24

According to RFC 6455 (https://tools.ietf.org/html/rfc6455#section-4.1):

7. The request MUST include a header field with the name
   |Sec-WebSocket-Key|. The value of this header field MUST be a
   nonce consisting of a randomly selected 16-byte value that has
   been base64-encoded (see Section 4 of [RFC4648]). The nonce
   MUST be selected randomly for each connection.

[e5l]

Hi @rogro82, thanks for the report.
It's obviously a bug and would be fixed in the next minor release.