How to read http status code for HEAD request

Question

I'm requesting an API with AFNetworking 4.3.1 and Http method GET and HEAD. It could return different http status code (100, 200, 402, ..)

My get function request working fine.

-(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);
        }
    ];
};

But my head function throw error.

-(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);
        }
    ];
};

At run time, I have this error on the line int statusCode = [[responseObject objectForKey:@"code"] intValue];

[__NSCFLocalDataTask objectForKey:]: unrecognized selector sent to instance 0x110f88860

The server properly handle the request and do it job.

I try other syntax:

int statusCode = (int) [responseObject statusCode];

'NSInvalidArgumentException', reason: '-[__NSCFLocalDataTask statusCode]: unrecognized selector sent to instance 0x145731af0'

from SO

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

[__NSCFLocalDataTask statusCode]: unrecognized selector sent to instance 0x129665ed0

What is the good way to get the http status code for a HEAD request with AFNetworking?

`responseObject` is a `NSCFLocalDataTask`, which should be, I guess a `URLSessionTask`. Try to print it first. `NSLog(@"Response tasks: %@", responseObject);` But then, it's that's one: `URLSessionTask *task = (URLSessionTask *)responseObject; NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)[task response]; int statusCode = (int) httpResponse.statusCode;` — Larme, Aug 20 '20 at 11:05
@Larme, Thanks for your help. now its work with ` NSURLSessionTask *task = (NSURLSessionTask *)responseObject; NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)[task response]; int statusCode = (int) httpResponse.statusCode; NSLog(@"Status code: %d", statusCode);` You could write an answer so I approve it. — europrimus, Aug 20 '20 at 12:18

score 0 · Accepted Answer · answered Aug 25 '20 at 08:38

As suggested by @Larme and confirmed by the source code of AFNetworking, HEAD:parameters:headers:success:failure: return a NSURLSessionDataTask

So I need to retrieve the NSHTTPURLResponse before I can get the statusCode.

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

How to read http status code for HEAD request

1 Answers1