Try use this code:

Code:
alias testt {
  if ($sock(testing)) { sockclose testing }
  sockopen -e testing chatdepot.twitch.tv 443
}

on *:sockopen:testing: {
  if ($sockerr) { sockclose $sockname | return }
  var %o = YOUR_OAUTH_TOKEN
  var %c = THE_CHANNEL
  var %n = THE_NICKNAME
  var %u = oauth_token= $+ %o $+ &irc_channel= $+ %c $+ &username= $+ %n
  sockwrite -nt $sockname POST /room_memberships HTTP/1.1
  sockwrite -nt $sockname Host: $sock($sockname).addr
  sockwrite -nt $sockname User-Agent: Mozilla/*
  sockwrite -nt $sockname Accept: application/json, text/javascript, */*; q=0.01
  sockwrite -nt $sockname Content-Type: application/x-www-form-urlencoded; charset=UTF-8
  sockwrite -nt $sockname Authorization: OAuth %o
  sockwrite -nt $sockname Cache-Control: no-cache
  sockwrite -nt $sockname Connection: keep-alive
  sockwrite -nt $sockname Content-Length: $len(%u)
  sockwrite -nt $sockname $+($crlf,%u)
}

on *:sockread:testing:{
  if ($sockerr) { sockclose $sockname | return }
  sockread %temp
  if ($sockbr) { echo 2 -a READ: $left(%temp,4098) }
}

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