GWT: Check if URL is dead

Question

I'm trying to check if a url (in String form) returns 404 error. However, I can't seem to use java.net.URL, and I read somewhere that java.net is not supported in GWT? If so, how do I check if URL is dead or not in GWT?

Much appreciated.

This was already answered in this SO question: http://stackoverflow.com/questions/1378199/how-to-check-if-a-url-exists-or-returns-404-with-java — RoflcoptrException, Oct 01 '11 at 20:47
Roflcoptr, that question did not concern GWT client-side inquiry. So is not duplicated by this question. — Blessed Geek, Oct 02 '11 at 02:36

score 4 · Accepted Answer · answered Oct 01 '11 at 22:08

4

You are right. In client side GWT you cannot use java.net.URL. Take a look at Google's JRE Emulation Reference if you are unsure what parts of the Java standard library can be uses with GWT.

Theoretically it would be possible to check a URL with an AJAX request (see RequestBuilder). But due to the same origin policy it is likely that the browser prevents such an attempt.

So I think you should implement the check on your applications server side (according to the link provided by Roflcoptr above in the comments) and call that routine with GWT-RPC.

answered Oct 01 '11 at 22:08

vanje

10,180
2
31
47

gotcha, I'm going to try adding that to the server side. Thanks! – Jin Oct 01 '11 at 22:42
Jin, I think you should also flag the answer +1, besides flagging it as accepted answer. BTW, that +1 was mine, now's your turn. – Blessed Geek Oct 02 '11 at 02:28

GWT: Check if URL is dead

1 Answers1

Linked