Websocket: bad handshake at socketmode

[vincentlau0493]

What happened

I tried to skip TLS verification when using slack socketmode, but I got websocket bad handshake issue, here is my code:

tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
httpClient := &http.Client{Transport: tr}
client := slackgo.New(
slackCfg.BotToken, slackgo.OptionAppLevelToken(slackCfg.AppToken), slackgo.OptionHTTPClient(httpClient), slackgo.OptionDebug(true))
dialer := websocket.DefaultDialer
dialer.TLSClientConfig = &tls.Config{
InsecureSkipVerify: true,
}
socketModeClient = socketmode.New(client, socketmode.OptionDebug(true), socketmode.OptionDialer(dialer))

Here is log:

slack-go/slack2024/12/13 02:46:39 socket_mode.go:30: Using URL: wss://wss-primary.slack.com/link/?ticket=xxx&app_id=xxx
slack-go/slack/socketmode2024/12/13 02:46:39 socket_mode_managed_conn.go:301: Dialing to websocket on url wss://wss-primary.slack.com/link/?ticket=xxx&app_id=xxx
slack-go/slack/socketmode2024/12/13 02:46:43 socket_mode_managed_conn.go:311: Failed to dial to the websocket: websocket: bad handshake
slack-go/slack/socketmode2024/12/13 02:46:43 socket_mode_managed_conn.go:270: reconnection 10 failed: websocket: bad handshake reconnecting in 51.2s

Expected behavior

Steps to reproduce

reproducible code

manifest.yaml

Versions

• Go: 1.23
• slack-go/slack: v0.13.1

[nlopes]

The commit that closes this should allow you to troubleshoot further. Feel free to reopen with any additional information you get from running against this commit.