Checking if URL is Valid -404/Not Found

Question

I'm using the following method to check if a URL Exists or is valid.

class MyClient : WebClient
{
    public bool HeadOnly { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest req = base.GetWebRequest(address);

        if (HeadOnly && req.Method == "GET")
        {
            req.Method = "HEAD";
        }
        return req;
    }
}

private static Boolean CheckURL(string url)
{
    using (MyClient myclient = new MyClient())
    {
        try
        {
            myclient.HeadOnly = true;
            // fine, no content downloaded
            string s1 = myclient.DownloadString(url);
            return true;
        }
        catch (Exception error)
        {
            return false;
        }
    }
}

Is my approach correct? How to Display the Status of a checked URL eg:404,Success etc to the user?

Please advice..

You need to look at the status code exposed by a WebException: Possible duplicate of Web Response status code — Alex K.
– Alex K., Commented Jul 10, 2017 at 11:32
You should probably also include a believable user-agent header. — Alex K.
– Alex K., Commented Jul 10, 2017 at 11:33

Pratius Dubey · Accepted Answer · 2017-07-10 11:30:33Z

2

Here is your question of answer.

public static void isURLExist(string url)
    {
        try
        {
            WebRequest req = WebRequest.Create(url);

            WebResponse res = req.GetResponse();

            Console.WriteLine("Url Exists");
        }
        catch (WebException ex)
        {
            Console.WriteLine(ex.Message);
            if (ex.Message.Contains("remote name could not be resolved"))
            {
                Console.WriteLine("Url is Invalid");
            }
        }
    }

answered Jul 10, 2017 at 11:30

Pratius Dubey

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2 Comments

Pratius Dubey Over a year ago

specific message it's depend on your requirement.

DesertFoxAZ Over a year ago

WebResponse implements IDisposable - you should be sure to dispose of it

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