[お手軽ChatOps] サーバサイドで起きた諸々の事象をSlackbotに通知してもらう ref: http://qiita.com/kidachi_/items/7f1053acb9dffc5c684d

file0.txt

https://slack.com/api/chat.postMessage?channel=<channel_name>&text=<text>&token=<your_token>&username=<bot_name>

file1.rb

require 'addressable/uri'
require 'net/http'

endpoint = 'https://slack.com/api/chat.postMessage'
token='hogehoge'
channel='#slack_bot_test'
text='hello,slackbot!'
username='slackbot'

uri = Addressable::URI.parse(endpoint)
query = {token: token, channel: channel, text: text, username: username}
uri.query_values ||= {}
uri.query_values = uri.query_values.merge(query)

Net::HTTP.get(URI.parse(uri))
=> "{\"ok\":true,\"channel\":\"C02EZTYKS\",\"ts\":\"1407134492.000010\"}"