It's not a server issue. The extra parameters are needed to create previews and prepare the UI for the size of the image. There are multiple ways to do it, but in the end they will always be there.
It's better to have them in the URL directly if people are copying urls from post to post. Then they copy everything together.
Copying attachment URL that were longer than the user post / reply is absurd.
Why not handle it in HTTP header instead? (Like with `img_bitmap` http header representing the bitmap of image preview) or even via event tags?
Sure. You want to get this working well. But putting everything into a single URL creates a big burden for users.
Copying a url with all the tags in it is key. Lots of people copy the url from somebody else into their posts. If we place these tags in any other location, they are not going to be copied to the new post. In this way, users keep spreading the improved experience even in clients that do not support these tags.
