On Tue, Jul 28, 2015 at 3:19 PM, Bernd Sitzmann bernd@wikimedia.org wrote:
*1) leadImageWidth: * *1A)* If the clients uses a constant value, let's say 800px for thumbsize action=mobileview parameter then the client could replace the /800px- portion in the resulting URL with the desired width, as long as the URL structure stays predictable[2]. If the string replacement fails we could still use the 800px URL.
MediaWiki thumbnail URLs are fragile and not meant to be used as an API. Mainly because of T74328 https://phabricator.wikimedia.org/T74328 but also because finding the size part is not always trivial (e.g. for a JPEG the URL could look like upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Cernfounders.jpg/qlow-1024px-Cernfounders.jpg ).