A few years back I had a great live-experience regarding failed Content-Negotiation. I was sitting in Montreal in a restaurant waiting for the waiter. Once they came they asked me something in french and I immediately told them that I don’t understand french and whether we could speak english. We could. So I got a menu (in english and french) and a few minutes later they came back to take my order. And they talked to me – again – in french. So we had to go through the whole dance again.

What does that have to do with Content-Negotiation? Well: We did negotiate that we would communicate in english. Comming back to me with some language that we already had established I can’t understand doesn’t make sense. And I might just not understand what they want.