记录一下：
** AFN 经典报错
# **1. 报错如下:**
**Assertion failure in -[AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:], /Users/Yan/Desktop/Yan/Doctor/Pods/AFNetworking/AFNetworking/AFURLRequestSerialization.m:353**
**2016-08-17 21:22:01.022 fastDoctor[4725:172619] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: URLString'**
# 2. 原因**reason: 'Invalid parameter not satisfying: URLString'**
**URL拼接错误!!! -----> **NSString * _url = @" http://iosapi.baidu.cn/doctor/searchCI3List.json.php";
正确的URL-------> NSString * _url = @"http://iosapi.baidu.cn/doctor/searchCI3List.json.php";
# 3. ???
多加了一个而空格!!!
