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.

Iq

Possible duplicate of #4938510. – Pelham

Edited question to request Monotouch – Iq

Answer 1

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];
}

Whitebook

Note that, despite the use of dot notation, statusCode is not a property. – Alaniz

@albertamg, oops indeed... thanks, will correct that to avoid confusion – Whitebook

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. – Magnetochemistry

Answer 2

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).

Nels

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 – Phagocyte

Thanks heaps, that helped me. Thanks for the 401, that the error I was trying to trap. error.code = -1012 as you said. – Rosaniline

Answer 3

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);
   }
}

Iq

Answer 4

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];
}

Inflict