Hi, one of the authors here. Correct, we added that to the protocol FAQ too: https://github.com/tus/tus-resumable-upload-protocol/blob/master/protocol.md#why-ar

Hi, one of the authors here. Correct, we added that to the protocol FAQ too: https://github.com/tus/tus-resumable-upload-protocol/blob/master/protocol.md#why-are-you-not-using-the-x--prefix-for-your-headers https://github.com/tus/tus-resumable-upload-protocol/blob/ma... The only exception is X-HTTP-Method-Override, as people have been standardizing on this, and the header is specifically meant to let people deploy tus in environments that don't support all of HTTP and are apparently hard to change.