Event ping on page 15

[claudia1204]

Hello~
First thanks for your knowledge sharing in your book, it helps me a lot to understand websocket~~
But I found a little mistake here on page 15, it says "PING frames are sent out by the server only, and browser implementations should send back PONG frames in response."
in mdn, it says that "At any point after the handshake, either the client or the server can choose to send a ping to the other party."
Wish your book is getting better and better

[kinabalu]

@ClaudiaHunter you're right, that section was meant to reference the lack of a JavaScript API for sending PING frames from the browser, but the browser itself of course will send PINGs from the specific implementation.

I've got a note to talk with O'Reilly about adding that to the Errata but their system is currently down. Thank you for the feedback!

[claudia1204]

@kinabalu You're welcome~ O(∩_∩)O