sending POST in ruby?

You can do something like this...

require 'net/http'

postData = Net::HTTP.post_form(URI.parse('http://thewebsite.net'), {'postKey'=>'postValue'})

puts postData.body

The standard library Net::HTTP is pretty straightforward and handles POST.

From the docs:

response = http.post('/cgi-bin/search.rb', 'query=foo')

# using block
File.open('result.txt', 'w') {|f|
  http.post('/cgi-bin/search.rb', 'query=foo') do |str|
    f.write str
  end
}

For more detailed examples of how to use Net::HTTP, see August Lilleaas's Net::HTTP cheat sheet repository on Github.