With the newest trunk version and consequently, all versions > 1.12 of ttRSS, it is possible to directly subscribe to URLs like that.
For older versions, the user has to have or add a feed to ttRSS and subsequently change its URL, e.g. one can subscribe to a dummy feed with the content
Code: Select all
Put the content in a file on your hosting, and subscribe to http://localhost/filename. This should add a feed with the title [Unknown] into your feed list, whose URL you can change to an Instagram one then.
edited because of subscribe hook