Error with PUTS to API

gistfile1.rb

# ERROR OUTPUT IN TERMINAL

#Started POST "/tickets/525204671" for 127.0.0.1 at 2014-05-03 23:17:01 -0600
#Processing by WelcomeController#update as HTML
#  Parameters: {"price"=>"66.77", "event"=>"4426617", "id"=>"525204671"}
#<HTTParty::Response:0x7fd0cb6d1520 parsed_response={"error"=>{"code"=>"java.io.EOFException", "description"=>"No content to map to Object due to end of input", "requestId"=>"_76a2d494-5936-431d-9889-a71ec03b3fe8"}}, @response=#<Net::HTTPInternalServerError 500 Internal Server Error readbody=true>, @headers={"content-type"=>["application/json"], "com-stubhub-dye"=>["_76a2d494-5936-431d-9889-a71ec03b3fe8"], "com-stubhub-dye-path"=>["_76a2d494-5936-431d-9889-a71ec03b3fe8"], "server"=>["Apache"], "expires"=>["Sun, 04 May 2014 05:17:01 GMT"], "cache-control"=>["max-age=0, no-cache, no-store"], "pragma"=>["no-cache"], "date"=>["Sun, 04 May 2014 05:17:01 GMT"], "connection"=>["close"]}>
#Redirected to http://localhost:3000/events/4426617
#Completed 302 Found in 231ms (ActiveRecord: 0.0ms)



# WELCOME/SHOW


        <form action="/tickets/<%= ticket_group["id"] %>" method="post">
          <input type="text" name="price" value="<%= "$#{ticket_group["pricePerTicket"]["amount"]}" %>"><input type="hidden" name="event" value="<%= ticket_group["eventId"] %>"><input type="submit" value="Update"></td>


# WELCOMECONTROLLER


class WelcomeController < ApplicationController

  def show
    @ticket_groups = StubHub.new.ticket_group_by_event(params[:id])
  end

  def update
    StubHub.new.update_price(params[:id], params[:price])
    redirect_to "/events/#{params[:event]}"
  end
end

# STUBHUB MODEL

class StubHub

  def update_price(id, price)
    HTTParty.put("https://api.stubhub.com/inventory/listings/v1/#{id}", {:query => {:listing => {:pricePerTicket => {:amount => "#{price}", :currency => 'USD'}}}, :headers => {'Content-Type' => 'application/json', 'Authorization' => 'Bearer 11d416791974aac1769684fba7f5f9'}})
  end

end