I have this post request:

curl -i -X POST \
   -H "Accept:application/json" \
   -H "content-type:application/x-www-form-urlencoded" \
   -d "disambiguator=Document&confidence=-1&support=-1&text=President%20Obama%20called%20Wednesday%20on%20Congress%20to%20extend%20a%20tax%20break%20for%20students%20included%20in%20last%20year%27s%20economic%20stimulus%20package" \
   http://spotlight.dbpedia.org/dev/rest/annotate/

How can I write it in ruby? I tried this as Kyle told me:

require 'rubygems'
require 'net/http'
require 'uri'

uri = URI.parse('http://spotlight.dbpedia.org/rest/annotate')

http = Net::HTTP.new(uri.host, uri.port)

request = Net::HTTP::Post.new(uri.request_uri)
request.set_form_data({
                      "disambiguator" => "Document",
                      "confidence"    => "0.3",
                      "support"       => "0",
                      "text"          => "President Obama called Wednesday on Congress to extend a tax break for students included in last year's economic stimulus package"
                      })

request.add_field("Accept", "application/json")
request.add_field("Content-Type", "application/x-www-form-urlencoded")

response = http.request(request)
puts response.inspect

but got this error:

#<Net::HTTPInternalServerError 500 Internal Error readbody=true>