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// 请求头里面的参数最好都写

   AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

[manager.requestSerializer setValue:@"application/json;charset=utf-8" forHTTPHeaderField:@"Content-Type"];
// 设置请求头里面的host
[manager.requestSerializer setValue:@"api.wusejia.com" forHTTPHeaderField:@"Host"];

// 防止参数被AFNetworking转码
[manager.requestSerializer setQueryStringSerializationWithBlock:^NSString * _Nonnull(NSURLRequest * _Nonnull request, id _Nonnull parameters, NSError * _Nullable __autoreleasing * _Nullable error) {
return parameters;

}];

// 设置body体

[manager POST:@"http://api.wusejia.com/auth/mobile" parameters:@"{\"password\":\"jian199311043658\",\"cellphone\":\"18242366101\"}" progress:^(NSProgress * _Nonnull uploadProgress) {

} success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {

// 请求成功
NSLog(@"%@",task.currentRequest);
NSLog(@"%@", [task.currentRequest allHTTPHeaderFields]);
NSLog(@"%@", responseObject);
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
// 请求失败
}];