Found README in app bundle. Clearer instructions there, works with 4.2.2.
> ABOUT WEBPING BUNDLE
> ==================== This bundle will check a set of webpages every interval
> and index the result, time, size and
> optionally content and or crc of
> page(s).
>
> To start: Copy bundle into your
> $SPLUNK_HOME/etc/apps directory Modify
> the following arguements in urls.conf
> For each url you wish to check, add a
> stanza like the following
> [mypage]
> url = http://www.mypage.com
> timeout = 10
> indexResults = false
> userAgent = Mozilla/4.0
> indexMD5 = false
> indexResults = false
>
> NOTE: A true value can be indicated by
> any of the following:
>
> true 1 t on yes
>
> You can add as many pages above as you
> wish. Make sure that each page has a
> unique [name] ex. [mypage] If you
> index the Results, be careful the
> payload can be large.
>
> If you have bugs or suggestions please let us know.
> support@splunk.com. Good luck!
>
> TODO:
> ============
> - add in the filtering and matching from the imap bundle so you can filter
> content
> - add back in the n level crawling
> - add support for auth/login
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