在使用afnetworking的时候可能会碰到下面的错误：
{ status code: 200, headers {
"Content-Length" = 14;
"Content-Type" = "text/plain;charset=utf-8";
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Date = "Thu, 22 May 2014 10:37:50 GMT";
Server = "Apache-Coyote/1.1";
"Set-Cookie" ="JSESSIONID=C0DFED60A154557F8386E62AB2A066CE; Path=/FHJRDT";
} }, NSLocalizedDescription=Request failed:unacceptable content-type: text/plain}
此时需要修改AFNetworking可接收的Content-Type，前往AFNetworking源代码目录找到AFURLResponseSerialization.m文件将里面的代码：
self.acceptableContentTypes =[NSSetsetWithObjects:@"application/json",@"text/json",@"text/javascript",nil];
修改为：
self.acceptableContentTypes =[NSSetsetWithObjects:@"application/json",@"text/json",@"text/javascript",@"text/html",nil];
self.acceptableContentTypes =[NSSetsetWithObjects:@"application/json",@"text/json", @"text/javascript" ,@"text/plain" , nil];
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