Send as POST is an app for iOS and macOS that adds a share extension to images and web pages.
Sharing via Send as POST will create a POST request with these parameters:
image: the image data
caption(optional): the text provided in the share card.
url: the URL of the page
quote(optional): the highlighted text on the page, if any
comment(optional): the text added in the sharing card, if any
title(optional): the text specified in the title field of the sharing card, if any. Defaults to the title of the page being shared
Additional parameters, e.g. a shared secret, can be configured in the app. They will be sent with each POST request.