AF3.0 上传图片 报错-1016 Request faile

因为上传使用的是AFURLSessionManager ，而AFURLSessionManager默认的responseSerializer是AFURLResponseSerialization，而AFURLResponseSerialization默认是AFJSONResponseSerializer的一个实例，而AFJSONResponseSerializer不支持text/html。

解决方法：重新替换responseSerializer
AFHTTPResponseSerializer *responseSerializer = [AFHTTPResponseSerializer serializer]; 
responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", @"text/plain", nil];
    manager.responseSerializer = responseSerializer;