如何读取HEAD请求的http状态代码

Question

我请求使用AFNetworking 4.3.1和Http方法的APIGET和HEAD。它可以返回不同的http状态代码(100200402，..(

我的get功能请求运行良好。

-(void) getApiV2:(NSString *)url
parameters:(NSDictionary *)param
success:(successBlock)mSuccessBlock
failure:(failureBlock)mfailureBlock{
NSMutableDictionary *httpHeader =[NSMutableDictionary dictionary];
if(TOKEN !=nil){
[httpHeader setObject:TOKEN forKey:@"Token"];
}
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager
GET:url
parameters:param
headers:httpHeader
progress:nil
success: ^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject){
int statusCode = [[responseObject objectForKey:@"code"] intValue];
NSArray *data = [responseObject objectForKey:@"data"];
BLOCK_SAFE_RUN(mSuccessBlock,data,statusCode);
}
failure: ^(NSURLSessionDataTask * dataTask, NSError * error){
BLOCK_SAFE_RUN(mfailureBlock,error);
}
];
};

但是我的头函数抛出错误。

-(void) head:(NSString *)url success:(successBlock)mSuccessBlock failure:(failureBlock)mfailureBlock{
NSMutableDictionary *httpHeader =[NSMutableDictionary dictionary];
if(TOKEN !=nil){
[httpHeader setObject:TOKEN forKey:@"Token"];
}
AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
[manager
HEAD:url
parameters:nil
headers:httpHeader
success: ^(id _Nullable responseObject){
int statusCode = [[responseObject objectForKey:@"code"] intValue];
BLOCK_SAFE_RUN(mSuccessBlock,responseObject,statusCode);
}
failure: ^(NSURLSessionDataTask * dataTask, NSError * error){
BLOCK_SAFE_RUN(mfailureBlock,error);
}
];
};

在运行时，我在int statusCode = [[responseObject objectForKey:@"code"] intValue];线上出现此错误

[__NSCFLocalDataTask objectForKey:]：无法识别的选择器发送到实例0x110f88860

服务器正确处理请求并完成它的工作。

---

我尝试其他语法：

int statusCode = (int) [responseObject statusCode];

"NSInvalidArgumentException"，原因："-[__NSCFLocalDataTask statusCode]：无法识别的选择器发送到实例0x145731af0">

来自SO

NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)responseObject;
int statusCode = (int) httpResponse.statusCode;

[__NSCFLocalDataTask statusCode]：无法识别的选择器发送到实例0x129665ed0

---

使用AFNetworking获取HEAD请求的http状态代码的好方法是什么？

Answer 1

根据@Larme的建议并经AFNetworking源代码确认，HEAD:parameters:headers:success:failure:返回一个NSURLSessionDataTask

所以我需要先检索NSHTTPURLResponse，然后才能获得statusCode。

NSURLSessionTask *task = (NSURLSessionTask *)responseObject;
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)[task response];
int statusCode = (int) httpResponse.statusCode;
NSLog(@"Status code: %d", statusCode);