Cocoa Error 3840 when POST Request with AFNetworking 2 - ios

Question

I call this function and return Cocoa Error 3840 every time.
I try to debug and fix it and it error when request rather than when parse the result
I found this error in failure blocks when request.
Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x109230960 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not et.}
2013-11-01 12:09:30.925 MagicBox[87431:70b] The operation couldn’t be completed. (Cocoa error 3840.)
That's my code
Thanks in Advance.
- (void)loginWithUserName:(NSString *)userName
Password:(NSString *)password
orFacebook:(NSString *)facebookID
withResponseBlock:(ResponseBlock)responseBlock {
if (!userName && !facebookID) {
NSError *error = [NSError errorWithDomain:#"Missing Parameters"
code:400
userInfo:#{ NSLocalizedDescriptionKey : #"Username or FacebookID is required"}];
responseBlock(error, nil);
}
NSDictionary *params;
if (facebookID) {
params = #{ #"fb_id": facebookID };
} else {
params = #{ #"username": userName,
#"password": password };
}
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSString *loginURL = [self requestWithPath:#"/api/login"];
[manager POST:loginURL
parameters:params
constructingBodyWithBlock:nil
success:^(AFHTTPRequestOperation *operation, id responseObject) {
if (responseBlock) {
responseBlock(nil, responseObject);
}
}
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
if (responseBlock) {
responseBlock(error, nil);
}
}];
}

Answer 1

I solved it by adding following line of code
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

Answer 2

Had been stuck with the same problem.
I solved it by this:
self.requestSerializer = [AFJSONRequestSerializer serializer];
i.e. double check whether the AFHTTPRequestOperationManager uses correct request serializer.
Hope this can help you!

Answer 3

I solved this by making sure the returned data is in the correct serialization with google spreadsheets XML response (instead of JSON)
manager.responseSerializer = [AFXMLParserResponseSerializer serializer];

Answer 4

I solved it by adding following line of code
manager.requestSerializer = [AFJSONRequestSerializer serializer];