NSUrlConnectionDelegate - Getting http status codes

Question

in iOS, how can I receive the http status code (404,500 200 etc) for a response from a web server. I am assuming it's in the NSUrlConnectionDelegate.

Objective-C or Monotouch .NET answer ok.

Possible duplicate of http://stackoverflow.com/questions/4938010/how-do-i-check-an-http-request-response-status-code-from-ios. — csano, Aug 02 '11 at 21:25

Vladimir · Accepted Answer · 2011-08-02T21:34:00.427

88

Yes, you can get status code in delegate method -didRecieveResponse:

- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
   NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
   int code = [httpResponse statusCode];
}

edited Aug 02 '11 at 21:34

answered Aug 02 '11 at 21:24

Vladimir

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Note that, despite the use of dot notation, statusCode is not a property. – albertamg Aug 02 '11 at 21:32
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@albertamg, oops indeed... thanks, will correct that to avoid confusion – Vladimir Aug 02 '11 at 21:33
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I realise this is obvious, but I'll note it just for the sake of completeness: anywhere else that you get an `NSURLResponse` in response to a HTTP request (such as the completion handler of `sendAsynchronousRequest:queue:completionHandler:`, you can cast the `NSURLResponse` to an `NSHTTPURLResponse` in exactly the same way. – Mark Amery Aug 22 '13 at 09:12

score 11 · Answer 2 · edited Nov 01 '13 at 01:08

11

NSHTTPURLResponse* urlResponse = nil;
NSError *error = nil;
responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];

The aSynchronous request should also have a way to get the NSHTTPURLResponse..

You get the status code like this:

int statusCode = [urlResponse statusCode];
int errorCode = error.code;

In the case of some much used error codes (like 404) it will get put in the error but with a different code (401 will be -1012).

edited Nov 01 '13 at 01:08

John Ballinger

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answered Aug 02 '11 at 21:24

Manuel

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There is no need to alloc error - just check if error is not null on return - if it isn't you should have an error code – gheese Oct 29 '13 at 23:06
Thanks heaps, that helped me. Thanks for the 401, that the error I was trying to trap. error.code = -1012 as you said. – John Ballinger Nov 01 '13 at 01:11

score 3 · Answer 3 · answered Aug 02 '11 at 22:17

Here's how to do it in MonoTouch for .NET for those C# users. THis is in the NSUrlConnectionDelegate.

public override void ReceivedResponse (NSUrlConnection connection, NSUrlResponse response)
{
  if (response is NSHttpUrlResponse)
  {
    var r = response as NSHttpUrlResponse;
    Console.WriteLine (r.StatusCode);
   }
}

score 1 · Answer 4 · edited May 23 '17 at 12:32

Looking at this other stackoverflow question it looks like you can handle http status codes in the - (void)connection:(NSURLConnection *)aConnection didReceiveResponse:(NSURLResponse *)response delegate method:

- (void)connection:(NSURLConnection *)aConnection didReceiveResponse:(NSURLResponse*)response 
{
    if ([response isKindOfClass: [NSHTTPURLResponse class]])
        statusCode = [(NSHTTPURLResponse*) response statusCode];
}

NSUrlConnectionDelegate - Getting http status codes

4 Answers4

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