lib/restclient/request.rb
def process_url_params(url, headers)
      url_params = nil

      # find and extract/remove "params" key if the value is a Hash/ParamsArray
      headers.delete_if do |key, value|
        if key.to_s.downcase == 'params' &&
            (value.is_a?(Hash) || value.is_a?(RestClient::ParamsArray))
          if url_params
            raise ArgumentError.new("Multiple 'params' options passed")
          end
          url_params = value
          true
        else
          false
        end
      end

      # build resulting URL with query string
      if url_params && !url_params.empty?
        query_string = RestClient::Utils.encode_query_string(url_params)

        if url.include?('?')
          url + '&' + query_string
        else
          url + '?' + query_string
        end
      else
        url
      end
    end
def process_url_params(url, headers)
      url_params = nil

      # find and extract/remove "params" key if the value is a Hash/ParamsArray
      headers.delete_if do |key, value|
        if key.to_s.downcase == 'params' &&
            (value.is_a?(Hash) || value.is_a?(RestClient::ParamsArray))
          if url_params
            raise ArgumentError.new("Multiple 'params' options passed")
          end
          url_params = value
          true
        else
          false
        end
      end

      # build resulting URL with query string
      if url_params && !url_params.empty?
        query_string = RestClient::Utils.encode_query_string(url_params)

        if url.include?('?')
          url + '&' + query_string
        else
          url + '?' + query_string
        end
      else
        url
      end
    end
Extract the query parameters and append them to the url

 Look through the headers hash for a :params option (case-insensitive,
 may be string or symbol). If present and the value is a Hash or
 RestClient::ParamsArray, *delete* the key/value pair from the headers
 hash and encode the value into a query string. Append this query string
 to the URL and return the resulting URL.

 @param [String] url
 @param [Hash] headers An options/headers hash to process. Mutation
   warning: the params key may be removed if present!

 @return [String] resulting url with query string