Request with Accept header to application/json returns 406

[snicoll]

I don't know if that's intended. It seems inconsistent to me at the very least. The following calls with an Accept header set to application/json fail with a 406:

• https://api.spring.io/projects/spring-boot
• https://api.spring.io/projects/spring-boot/generations

However calling https://api.spring.io/projects/spring-boot/releases work.

I am not sure it is worth rejecting anything that doesn't ask specifically for HAL but if we do it, then I believe the releases endpoint should reject such request as well.