how to check if rtmp or hls urls are exist or they'll give 404 error in swift

Question

I need to parse some data from rss and open related links from parsed rss in swift 2, for example i want to check this link is valid or not:

rtmp://185.23.131.187:1935/live/jomhori1

or this one :

http://185.23.131.25/hls-live/livepkgr/_defint_/liveevent/livestream.m3u8

My code to check the validation of the url :

let urlPath: String = "http://185.23.131.25/hls-live/livepkgr/_defint_/liveevent/livestream.m3u8"
                            let url: NSURL = NSURL(string: urlPath)!
                            let request: NSURLRequest = NSURLRequest(URL: url)
                            let response: AutoreleasingUnsafeMutablePointer<NSURLResponse?>=nil

                            var valid : Bool!

                            do {
                                _ = try NSURLConnection.sendSynchronousRequest(request, returningResponse: response)
                            } catch {
                                print("404")
                                valid = false
                            }

I've searched the web but all the method I found wasn't helpful for my issue.

When you say valid, do you mean if the URL is the proper format or if you get an expected response from it? — sschale, Feb 29 '16 at 19:30
@sschale I mean if the url is exist or not, i handle 404 error message — anonymox, Feb 29 '16 at 19:46

score 6 · Answer 1 · edited Aug 28 '17 at 19:32

The answer by @sschale is nice, but NSURLConnection is deprecated, it's better to use NSURLSession now.

Here's my version of an URL testing class:

class URLTester {

    class func verifyURL(urlPath: String, completion: (isOK: Bool)->()) {
        if let url = NSURL(string: urlPath) {
            let request = NSMutableURLRequest(URL: url)
            request.HTTPMethod = "HEAD"
            let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { (_, response, error) in
                if let httpResponse = response as? NSHTTPURLResponse where error == nil {
                    completion(isOK: httpResponse.statusCode == 200)
                } else {
                    completion(isOK: false)
                }
            }
            task.resume()
        } else {
            completion(isOK: false)
        }
    }

}

And you use it by calling the class method with a trailing closure:

URLTester.verifyURL("http://google.com") { (isOK) in
    if isOK {
        print("This URL is ok")
    } else {
        print("This URL is NOT ok")
    }
}

Swift 3.0 with URLSession

class URLTester {

  class func verifyURL(urlPath: String, completion: @escaping (_ isOK: Bool)->()) {
    if let url = URL(string: urlPath) {
      var request = URLRequest(url: url)
      request.httpMethod = "HEAD"
      let task = URLSession.shared.dataTask(with: request, completionHandler: { (data, response, error) in
        if let httpResponse = response as? HTTPURLResponse, error == nil {
          completion(httpResponse.statusCode == 200)
        } else {
          completion(false)
        }
      })
      task.resume()
    } else {
      completion(false)
    }
  }
}

This is better than your answer because it only downloads the response headers instead of the whole page (also, it's better because asynchronous).

Thanks Awesome answer I'll use it to see if it works. – anonymox Mar 01 '16 at 13:39 — anonymox, Mar 01 '16 at 13:39

score 3 · Answer 2 · edited May 23 '17 at 12:32

I found a solution here in Objective C, so I ported the code to Swift (though you'll need to test it):

class testHandler: NSObject, NSURLConnectionDelegate{

    func testURL(urlPath: String){
        let url: NSURL = NSURL(string: urlPath)!
        let request = NSMutableURLRequest(URL: url)
        request.HTTPMethod = "HEAD"
        let connection = NSURLConnection(request: request, delegate: self)
    }

    func connection(connection: NSURLConnection,
        didReceiveResponse response: NSURLResponse){
            if response is NSHTTPURLResponse{
                if (response as! NSHTTPURLResponse).statusCode==200{
                    //url exists
                }
            }
    }

}

Thanks, i appreciate it. i'll check it and let you know – anonymox Feb 29 '16 at 20:18 — anonymox, Feb 29 '16 at 20:18

score 1 · Answer 3 · answered Aug 20 '17 at 14:57

An Obj-C variation for answer provided by @Moritz:

Note: I was preferring a function instead of a class, but the behavior is the same:

+(void)verifyURL:(NSString*)urlPath withCompletion:(void (^_Nonnull)(BOOL isOK))completionBlock
{
    NSURL *url = [NSURL URLWithString:urlPath];
    if (url) {
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        request.HTTPMethod = @"HEAD";
        //optional: request.timeoutInterval = 3;
        NSURLSessionDataTask *dataTask = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
        {
            BOOL isOK = NO;
            if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
                int code = (int)((NSHTTPURLResponse*)response).statusCode;
                //note: you may want to allow other http codes as well
                isOK = !error && (code == 200);
            }
            completionBlock(isOK);
        }];
        [dataTask resume];
    } else {
        completionBlock(NO);
    }
}

and here is a call with timestamps:

NSDate *date1 = [NSDate date];
[AppDelegate verifyURL:@"http://bing.com" withCompletion:^(BOOL isOK) {
    NSDate *date2 = [NSDate date];
    if (isOK) {
        NSLog(@"url is ok");
    } else {
        NSLog(@"url is currently not ok");
    }
    NSTimeInterval diff = [date2 timeIntervalSinceDate:date1];
    NSLog(@"time to return: %.3f", diff);
}];

score 0 · Accepted Answer · answered Mar 01 '16 at 10:06

0

For easy use I wrote below code and It's working perfectly.

var video_Url = ""
    if let url  = NSURL(string: Response),
    data = NSData(contentsOfURL: url)
    {
        video_Url = Response
    }
    else
    {
        video_Url = ""
    }

answered Mar 01 '16 at 10:06

anonymox

419
1
9
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how to check if rtmp or hls urls are exist or they'll give 404 error in swift

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