I am trying to check if the URL is accessible or not. I am using HttpURLConnection for it. This is now I am implementing it.
public static boolean isUrlAccessible(final String urlToValidate)
throws WAGException {
URL url = null;
HttpURLConnection huc = null;
int responseCode = -1;
try {
url = new URL(urlToValidate);
huc = (HttpURLConnection) url.openConnection();
huc.setRequestMethod("HEAD");
huc.connect();
responseCode = huc.getResponseCode();
} catch (final UnknownHostException e) {
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} catch (final MalformedURLException e){
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} catch (ProtocolException e) {
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} catch (IOException e) {
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} finally {
if (huc != null) {
huc.disconnect();
}
}
return responseCode == 200;
}
When the Internet is down it throws an UnknownHostException, I wanted to know how do I check if a fire wall is blocking a URL and thats why I get an exception and not because that the URL is not accessible. Also, I am just checking for response code 200 to make sure that the URL is accessible. Are there any other checks I need to perform?
When the Internet is down it throws an UnknownHostException
No, it throws that when the DNS is down or the host isn't known to DNS.
I wanted to know how do I check if a fire wall is blocking a URL
You will get a connect timeout. In rare cases with obsolete hardware you may get a connection refusal, but I haven't heard of that this century. But you will also get a connect timeout if the host is down.
I am just checking for response code 200 to make sure that the URL is accessible. Are there any other checks I need to perform?
No. But URLs aren't blocked by firewalls. Ports are blocked by firewalls.
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