Fetch sockets gain TCP keepalive, with a guard for keepalive: false (
b8ecc78)
Bun now mirrors undici more closely by only enabling SO_KEEPALIVE on fetch() sockets when the request is actually using keepalive. That means keepalive: false no longer gets TCP keepalive settings applied unconditionally, which matters for compatibility with node:http/node:https and agent.keepAlive behavior.
TCP keepalive is enabled for fetch client sockets (b9c757b)
fetch() now sets SO_KEEPALIVE with a 60-second idle timeout so half-open connections are detected instead of hanging on dead peers, matching Node/undici semantics. The new Linux test validates the kernel timer state and covers both the default behavior and the keepalive: false path.
Other misc changes
- None