chat.postMessage sample for Slack

chat_postmessage_sample.rb

require "faraday"

username = 'your name'
channel = 'your channel'
slack_token = 'your slack token'
icon_url = 'your icon url'

body = {
  username: username,
  channel: channel,
  icon_url: icon_url,
  text: "Hello world"
}

Faraday.new('https://slack.com') do |c|
  c.request :url_encoded
  c.adapter Faraday.default_adapter
end.post("/api/chat.postMessage?token=#{slack_token}", body)