Youtube API iOS : Request failed: bad request (400)

Question

I am developing an iOS app which require to get youtube channel and subscribe it. I can get list of channels without OAuth2 but for subscribe it I need to get access token by OAuth2 standard.

I can get access token by some handwork. But when I send this token into header with request into body for subscribe then it is giving me 'Bad Request (400)' Error.

Code for send request

NSString *URLString = [NSString stringWithFormat:@"https://www.googleapis.com/youtube/v3/subscriptions?part=snippet&key=%@", @"[mykey]"];

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    AFHTTPRequestSerializer *requestSerializer = [AFHTTPRequestSerializer serializer];

    [requestSerializer setValue:[NSString stringWithFormat:@"Bearer %@",[self accessToken]] forHTTPHeaderField:@"Authorization"];
    [requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

    manager.requestSerializer = requestSerializer;

    NSDictionary *parameters = @{@"snippet":@{
                                         @"resourceId":@{
                                                 @"channelId":[[[videoCountDetailArray objectAtIndex:0] valueForKey:@"snippet"] valueForKey:@"channelId"],
                                                 @"kind":@"youtube#channel"
                                                 }
                                         }
                                 };

    [manager POST:URLString parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"response ; %@",responseObject);

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"failed");        
    }];
    }

Getting Following error

Error Domain=com.alamofire.error.serialization.response Code=-1011 "Request failed: bad request (400)" UserInfo={com.alamofire.serialization.response.error.response=<NSHTTPURLResponse: 0x7fcfbccae3a0> { URL: https://www.googleapis.com/youtube/v3/subscriptions?part=snippet&key=myKey } { status code: 400, headers {
    "Cache-Control" = "private, max-age=0";
    "Content-Encoding" = gzip;
    "Content-Length" = 118;
    "Content-Type" = "application/json; charset=UTF-8";
    Date = "Wed, 25 May 2016 09:28:57 GMT";
    Expires = "Wed, 25 May 2016 09:28:57 GMT";
    Server = GSE;
    Vary = "Origin, X-Origin";
    "alt-svc" = "quic=\":443\"; ma=2592000; v=\"34,33,32,31,30,29,28,27,26,25\"";
    "alternate-protocol" = "443:quic";
    "x-content-type-options" = nosniff;
    "x-frame-options" = SAMEORIGIN;
    "x-xss-protection" = "1; mode=block";
} },

Any help will be appriciated.

Answer 1

I found the problem. There were two mistakes.

1. Actually, I was setting up different requestSerialiser and passing different serialiser.

2. I am passing APIKey into url for subscribe but No need to pass it.

My new code is

 NSString *URLString = [NSString stringWithFormat:@"https://www.googleapis.com/youtube/v3/subscriptions?part=snippet"];
        AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
        AFHTTPRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
        [requestSerializer setValue:[NSString stringWithFormat:@"Bearer %@",[self accessToken]] forHTTPHeaderField:@"Authorization"];
        [requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

        manager.requestSerializer = requestSerializer;

        NSDictionary *parameters =  @{@"snippet":@{
                                              @"resourceId":@{
                                                      @"channelId":[[[videoCountDetailArray objectAtIndex:0] valueForKey:@"snippet"] valueForKey:@"channelId"],
                                                      @"kind":@"youtube#channel"
                                                      }
                                              }
                                      };

        NSLog(@"parameters : %@",parameters);
        [manager POST:URLString parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
            NSLog(@"response ; %@",responseObject);
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"failed");
        }];