I am comparing the security information of two different HTTPS connections in the Google Chrome (v63.0.3239.132) security tab in developer tools. The information for each of the two connections is given below:
The first states ECDHE_ECDSA with X25519 as the key exchange. The second just states plainly that X25519 is the key exchange. This seems odd to me because X25519 is the curve, correct? Are these two key exchanges the same and they are just worded differently (for some reason)? Is this because of the use of QUIC?
The first site is an API, the second is
What are the differences, if any?