Parse referrer URL instead of using string value directly.

[snoopdave]

This PR changes the logic for processing referers so that the referer URL is validated before storage.

[mbien]

LGTM, small remark for your consideration:

org.apache.commons.validator.routines.UrlValidator might be better since it does not rely on the exception in the program flow. Lib is already in the dependencies.

example snippet in doc

[snoopdave]

LGTM, small remark for your consideration:

org.apache.commons.validator.routines.UrlValidator might be better since it does not rely on the exception in the program flow. Lib is already in the dependencies.

example snippet in doc

Thanks for the review. I switched over to URLValidator as you suggested.

[mbien]

@snoopdave excellent. LGTM. (the fixed test looks good too, I was wondering if it was only failing on my machine)

[mbien]

4c55a62 regexp eval replacement logic looks good to me