java.net.URL/URI consider an invalid URL as valid

Question

Not all invalid urls will be consider as invalid by java.net.URL/URI

An example: http:www.google.com

Is it a bug or is it a feature?

Or is maybe the string above a valid url?

That's not a valid URI. Perhaps you mean http://www.google.com. — chrylis -cautiouslyoptimistic-
– chrylis -cautiouslyoptimistic-, Commented Jul 27, 2018 at 8:03
If you paste that on the browser it works , and transforms it to google.com , maybe there is a similar functionality — Nikos Chatzivasileiadis
– Nikos Chatzivasileiadis, Commented Jul 27, 2018 at 8:05
No, I mean http:www.google.com. And yes, I know. it is an invalid URI, but it can be parsed by both java.net.URL and java.net.URI — Tima
– Tima, Commented Jul 27, 2018 at 8:05

Andreas · Accepted Answer · 2018-07-27 08:21:54Z

2

Without //, the URL is treated as a relative URL, that needs a context to be useful.

If you try using it, you'll get this error:

IllegalArgumentException: protocol = http host = null

answered Jul 27, 2018 at 8:21

Andreas

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1 Comment

thanks for explanation. I'm now using the java.net.URL to check if the given URL is valid in general and then check if it has host or not.