php - How To Discover RSS Feeds for a given URL -

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i url user. need know:
a) url valid rss feed?
b) if not there valid feed associated url

using php/javascript or similar

(ex. http://techcrunch.com fails a), b) return rss feed)

edit: see answer below

found wanted:

google's ajax feed api has load feed , lookup feed function (docs here).

a) load feed provides feed (and feed status) in json

b) lookup feed provides rss feed given url

theres find feed function searches rss feeds based on keyword.

planning use jquery's $.getjson


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