How does the slack website parse the URL images and text in the message without going through server?

if I enter a message containing the URL on slack"s chat site

https://codeshelper.com/a/1190000014660235-sharparticleHeader0

URL slack html text 3 slack web app

Chrome URL 5 http

http body headers URL
3
http body headers URL
request URL URL https://static.segmentfault.com/v-5b973eab/global/img/favicon.ico https://static.segmentfault.com/v-5b973eab/global/img/touch-icon-512.png

slack react web app URL

URL 2 http request

Jun.16,2021

through WebSocket
you may ask why you didn't see this capture, because you opened F12 after this connection. Refresh the page and you will have

Previous: Is the golang channel assignment shared?

Next: Mini Program uses setData to modify a property in the object. As a result, the object is emptied.