以前用的好端端的接口，今天访问居然出错了，但是再用浏览器测试，发现可以正常返回数据，甚是奇怪啊。
下面是错误信息：
获取服务器响应出错 error=ErrorDomain=com.alamofire.error.serialization.response Code=-1016"Request failed: unacceptable content-type: text/html"UserInfo=0x7fdfd8729680{com.alamofire.serialization.response.error.response=
{ URL:http://172.16.1.31:7001/itom/getwork } { status code: 200, headers{
"Cache-Control" = "no-cache";
"Content-Type" = "text/html;charset=UTF-8";
Date= "Mon, 24 Nov 2014 03:13:16 GMT";
"Transfer-Encoding" = Identity;
"X-Powered-By" = "Servlet/2.5 JSP/2.1";
} },NSErrorFailingURLKey=http://172.16.1.31:7001/itom/getwork,com.alamofire.serialization.response.error.data=<5b7b227374617475 73223a22 73756363 65737322
2c226d73 67223a22 e799bbe99986e688 90e58a9f 227d5d>, NSLocalizedDescription=Requestfailed: unacceptable content-type: text/html}
下面是百度出来的答案：
I also encountered the same problem.This means that your server issending "text/html" insteadof the already supported types. After a little search, my solutionwas toadd "text/html" to acceptableContentTypes setin AFURLResponseSerialization class.Just
search for "acceptableContentTypes" andadd @"text/html" tothe set manually. Of course, the ideal solution will be to changethe tpe from the server, but for that you will hade to talk withthe server team.
I hope this helps you. Best regards andless bugs as possible in the code.
op.responseSerializer.acceptableContentTypes =[NSSet setWithObject:@"text/html”];
对应到自己的项目里面，我用的是AFNetworking这套网络请求包，需要改的是：
AFURLResponseSerialization.m文件
223行：
self.acceptableContentTypes =[NSSetsetWithObjects:@"application/json", @"text/html",@"text/json",@"text/javascript", nil];
加上蓝色部分，其实就是添加一种服务器返回的数据格式。
也可以看看这个参考
http://www.isaced.com/post-254.html