urlIsReadable()
Tests whether a URL is readable. This method checks that a URL exists and that the engine is able to read from it.
Syntax
Boolean urlIsReadable(String url)- url is the URL to check.
Usage
Returns TRUE if the URL exists and is readable. Returns
FALSE if the URL does not exist or cannot be read.
Note: The result of this method is immediately outdated. There is no guarantee that a
subsequent attempt to open the URL will succeed.