POST request with x-www-form-urlencoded fails

POST request with x-www-form-urlencoded fails

I need to send a POST request with x-www-form-urlencoded parameters to a
URL. I'm using Typhoeus gem for this purpose.
@fetch =
Typhoeus::Request.post("http://www.diyanet.gov.tr/turkish/namazvakti/vakithes_namazsonuc.asp",
:params => {"ulk"=>"TURKIYE", "sehirler"=>"ADANA", "R1"=>"AYLIK"},
:headers=>{"Content-type"=>"application/x-www-form-urlencoded"})
But I don't get what I expected...
This is Postman (chrome extension) screenshot below. As you can see, I'm
setting everything the same and it runs properly at Postman.

Do you have any idea what's going wrong?
Different solutions/gems are welcomed too...