.tip

Mar 14, 2026 · one of the small things

lsof -i :3000 names the process holding the port

"Address already in use" and no idea what is using it.

lsof -nP -i :3000
kill $(lsof -t -i :3000)

-t prints only the pid, which makes it safe to feed to kill. -nP skips the DNS and port-name lookups that make it slow.

shelldebugging

~/tips/today — 2026-09-04

~cat tips/today

Session cookies: HttpOnly, Secure, SameSite=Lax

securityhttp

Three attributes, each closing a class of attack. HttpOnly keeps scripts from reading it. Secure keeps it off plain HTTP. SameSite=Lax stops it being sent on cross-site POSTs, which is most CSRF.

Set-Cookie: session=...; HttpOnly; Secure; SameSite=Lax; Path=/; Max-Age=1209600

Strict breaks arriving from an external link while logged in. Lax is the default worth keeping.

↵ open y yesterday l ls /tips

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