IOS AF网络get请求报错 Assertion failure in -[AFHTTPRequestSerializer requestWithMethod:URLSt

只写了个url就会报上面的错误，加一句话如下：

NSString*str1 = [uploadUrlstringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSetURLQueryAllowedCharacterSet]];

OK 搞定！！！！！

AFHTTPSessionManager * manager = [AFHTTPSessionManager manager];

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

[manager GET:str1 parameters:nil progress:^(NSProgress * _Nonnull downloadProgress) {

}success:^(NSURLSessionDataTask*_Nonnulltask,id_NullableresponseObject) {

NSLog(@"上传成功");

}failure:^(NSURLSessionDataTask*_Nullabletask,NSError*_Nonnullerror) {

NSLog(@"上传失败");

}];