"URL patterns use an extremely simple syntax. Every character in a pattern must match the corresponding character in the URL path exactly, with two exceptions. At the end of a pattern, /* matches any sequence of characters from that point forward. The pattern *.extension matches any file name ending with extension. No other wildcards are supported, and an asterisk at any other position in the pattern is not a wildcard.
So, you have to use the full path in this webapp, and you cannot insert wildcards unfortunately. The spec does not allow this.