NOTE: 6/10/2016 - Gulp file isn't currenlty working, so all js/css should be edited in the public folder until fixed
Benefits of Websockets
- Uses TCP
- Unlike AJAX or iframe, which use HTTP, websockets uses TCP connection to open and close connections.
- This means the client doesn't have to send the ~64 cookies with every single AJAX call.
- Client also doesn't send entire list of header information, provisions, etc.
Websockets > iFrame
That duplicated code will also need to be kept up with respect to the style guide (...haven't had great luck with that thus far)
No more worry about cross-origin domain policies!!!
The biggest pain in working with iFrames is the CORS issues when communicating to and from the iFrames parent. Websockets eliminate this issue, as no 'document.domain' needs to be worried about. Message origin still needs to be considered to make sure unexpected clients aren't connecting to our server.
The JS code for iFrame communication can be re-used for Websockets
Comparing this websockets code with the iFrame JS code you can see that the messaging events are identical, hence the idea behind the code can be re-used.
To move forward with iFrame solution just because you are already comfortable with it can put to rest knowing that the difficult part of the code (back and forth communication) is essentially the same.
iFrame > Websockets
- IE9 and less support (but there are plugins to polyfill)
- Websocket packet and general info: https://tools.ietf.org/html/rfc6455#section-5.2
- Get info on all open socket connections: chrome://net-internals/#sockets
- CDT Network tab -> WS/websockets will show off the client/server connections, length of packets (in bytes) and timestamps (localhost is RTT 3ms-5ms consistently)