写了请求：
Content-Type: application/x-www-form-urlencoded
Content-Length: SizeString
Authorization: "Bearer " + access_token
&printerid=2deb8a6d-86d7-4345-f3ad-ad7e0f7d2591&title=testname&ticket=testticket&content=base64string&contentTransferEncoding=base64
以及与www.google.com/cloudprint/submit
的关联但没有来自服务器的响应（超时错误）。我究竟做错了什么？ 例如，与www.google.com/cloudprint/list的连接没问题：
Content-Type: application/x-www-form-urlencoded
Content-Length: SizeString
Authorization: "Bearer " + access_token
&proxy=3D9B828E-F8FD-4F83-A32F-96F1F0B35C6B