AFNetworking 2.0 : Cannot POST with JSON from IOS
Solution 1
Actually, I finally got it to work.
Basically, for my requestSerializer of the AFHTTPRequestOperationManager, I was using AFHTTPRequestSerializer and then trying to set the Content-Type to "application/json"
But once I switched to using AFJSONRequestSerializer instead, it works fine now
AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
[requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
operationManagerInstance.requestSerializer = requestSerializer;
Solution 2
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
AFJSONRequestSerializer *serializer = [AFJSONRequestSerializer serializer];
[serializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[serializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
manager.requestSerializer = serializer;
now it will work.
Solution 3
I encountered the same problem using AFNetworking API through Swift, trying to send a post request and finally got it work as well thanks to user1805458's post.
Basically, for my requestSerializer of the AFHTTPRequestOperationManager, I was also using AFHTTPRequestSerializer and then trying to set the Content-Type to "Application/JSON" and it did not work.
But once I switched to using AFJSONRequestSerializer instead, it works fine now:
let manager = AFHTTPRequestOperationManager()
manager.requestSerializer = AFJSONRequestSerializer(writingOptions: nil)
// Contrary to user1805458's solution, I did not need to use these two instructions below using Swift.
// manager.requestSerializer.setValue("Application/JSON", forHTTPHeaderField:"Content-Type")
// manager.requestSerializer.setValue("Application/JSON", forHTTPHeaderField:"Accept")
I hope it will help you to fix this error in case where you use Swift, AFNetworking and try to send a post request containing a JSON body.
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user1805458
Updated on June 04, 2022Comments
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user1805458 almost 2 years
Ever since upgrading my IOS code to use AFNetworking version 2.0 instead of 1.x, I cannot do an HTTP Post any more with JSON parameters.
I suspect it is because my HTTP request header is not "application/json" but I have tried to do that and it still does not work.
This is my test code for trying to POST by JSON:
NSDictionary *parameters = [NSDictionary dictionaryWithObjectsAndKeys: email, @"email", password, @"password", nil]; [[OTApiClient sharedInstance] POST:@"login" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) { NSLog(@"result: %@", responseObject); Boolean response = [[responseObject valueForKey:@"success"] boolValue]; if(response == TRUE) { //ok, success NSLog(@"success"); UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Success!" message:@"Successfully logged in" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; } else { NSLog(@"Not successful"); UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Sorry" message:@"The email or password is incorrect." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; } dispatch_async(dispatch_get_main_queue(), ^{ [MBProgressHUD hideHUDForView:self.view animated:YES]; }); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"error: %@ , for operation: %@", error, operation); UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Sorry" message:@"There is a problem connecting to the server, please try again soon." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil]; [alert show]; dispatch_async(dispatch_get_main_queue(), ^{ [MBProgressHUD hideHUDForView:self.view animated:YES]; }); }]; });
and I keep getting this error :
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=0xca80730 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.} , for operation: <AFHTTPRequestOperation: 0xca6bee0, state: isFinished, cancelled: NO request: <NSMutableURLRequest: 0xca76040> { URL: http://1.2.3.4:9000/api/login }, response: <NSHTTPURLResponse: 0xc963d60> { URL: http://1.2.3.4:9000/error404 } { status code: 404, headers { "Content-Length" = 1809; "Content-Type" = "text/html; charset=utf-8";
} }>
I am very sure that the server is up and accessible because all other GET calls work properly.
I have checked the updated documentation for AFNetworking 2.0 and it seems like what I have is the right way to do a JSON POST
Please let me know if I missed anything
Thanks IS
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Grzegorz Krukowski over 10 yearsWhy "Content-Type" = "text/html; charset=utf-8"; instead of application/json ? Have you tried to fix that on server side ?
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SML almost 8 yearsthanks. works perfectly. i have wasted almost 5 hours to debug and check the issue.