方法说明：
该棒法用来将HTTP trailing响应头添加到消息尾部。
语法：
response.addTrailers(headers)
接收参数：
headers 响应头信息
例子：
response.writeHead(200, { 'Content-Type': 'text/plain', 'Trailer': 'Content-MD5' });
response.write(fileData);
response.addTrailers({'Content-MD5': "7895bf4b8828b55ceaf47747b4bca667"});
response.end();
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