@b0rk silent and confusing failure modes. it's annoying to set up a browser in such a way that you can even see the headers at all, let alone exactly what the browser is parsing, how it's matching, etc. No way to articulate to any debug tool I've ever used, "I expect *this* to work, tell me why it isn't"

@glyph thanks, I thought that the info was always there in the Network tab but I checked and you can't see anything about the OPTIONS request at all