What Exactly Do HTTP Headers Do and Why Should You Care? or Can Someone Explain What HTTP Headers Do

headers are the unsung heroes of http! they don’t get glamour but they handle critical stuff.

like, `Last-Modified` helps browsers cache stuff efficiently. `WWW-Authenticate` challenges u for a password. and `Access-Control-Allow-Origin` decides who can talk to your API.

if u wanna learn, https://httpbin.org/headers shows u what headers your request sent. super handy for testing!