在使用PUT发送请求时，代码逻辑是根据消息体的长度设置的，当没有消息体时，就会跳过设置消息长度这步，这时发出去的请求会返回
<html> <head><title>411 Length Required</title></head> <body bgcolor="white"> <center><h1>411 Length Required</h1></center> <hr><center>nginx/1.2.6</center> </body> </html>
我还以为是服务端把页面给我发回来了呢，仔细一看“Length Required”，才发现代码存在这个缺陷，第一次遇到这种问题，记录下来！
参考文章：
http://stackoverflow.com/questions/15619562/getting-411-length-required-after-a-put-request-from-http-client
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