问题
http://paultan.org/feed/
In above feed I can get the img ur like http://s2.paultan.org/image/2014/12/Theo-top-10-fave-renders-108x108.jpg
but in feedly.com I'm seeing other link of image, which have bigger size. I wonder how feedly can retrieve the 's content since it's not in the feed's DOM.
回答1:
Would this link represent the large image that you see?
http://s1.paultan.org/image/2014/12/top-10-posts.jpg
feedly.com may be reading the destination page once and save it in their database. From the header you have a Facebook entry as follow:
<meta content="http://s1.paultan.org/image/2014/12/top-10-posts.jpg"
property="og:image">
which feedly.com would be using to present the image. This, of course, means a lot more bandwidth used in order to be able to display such information. They may also limit it to websites that have such headers (so they test once or twice, if the website does not offer a link like the og:image, they stop testing that website altogether, at least for a while...)
来源：https://stackoverflow.com/questions/27699805/get-url-from-xml-enclosure