CODEWITHSUNDEEP
javaandroidssl
SantiM
SantiM

Reputation: 312

Find out if an HTTPS url is online

I need a function which returns true if the certificate of a secure website is signed by a CA. In Android, if you try to connect to a self-signed certificate, it throws an SSLException, in this case I just catch it and return false. You can check the code:

public static boolean isValidCertificate(URL url) throws IOException {
    HttpsURLConnection con;
    try {
        con = (HttpsURLConnection) url.openConnection();
        con.connect();
        con.disconnect();
        return true;
    } catch (SSLException e) {
        return false;
    } 
}

My problem is that I want the function to throw an Exception if the site is not avaliable. But I just found out that Android throws the same SSLException in this case, with the same message: "No trusted server certificate".

Is there any way of knowing whether the server is online regardless of whether the certificate is valid or not?

Thanks!

Upvotes: 1

Views: 1249

Answers (3)

SantiM
SantiM

Reputation: 312

I found the solution. I just need to check if the URL is online before calling this function. I can use my httpsclient without CA signed check and get the response, then, I call this method.

Upvotes: 0

Umer Hayat
Umer Hayat

Reputation: 2001

try using con.getResponseCode(); before con.disconnect(); to get exception that you want.

Upvotes: 1

Kirk
Kirk

Reputation: 16265

Test it with a fake URL such as "https://flimflam.asdfasdfasdfg.com" and see what happens in your case.

If should fire off an IOException if no connection was made based on the openConnection method. Most likely this is more of a timeout and you'll spend time waiting for the timeout period.

Upvotes: 2

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