[quote user="Dmitry"]Can you show your code example, so I can try to help ?[/quote]
In ruby:
http = Net::HTTP.new('api.myspace.com',)
request = Net::HTTP::Get.new('/request_token')
# sign the request with my consumer key and secret
request.oauth!(http, @oauth_consumer, nil, { :scheme => :query_string, :nonce ...