M5I01: HTTP Keep-Alive

[s2x]

What it builds

Persistent connections: multiple HTTP requests reuse one TCP connection.

Worker inspects response Connection header after handle():

• Connection: keep-alive → return to read() waiting for next request
• Connection: close → close immediately (current behavior)

New config:

• ListenerBuilder::keepAlive(bool) — default true for HTTP/1.1
• ListenerBuilder::keepAliveTimeout(int) — idle seconds before close (default 60)
• WorkerConfig::keepAliveMaxRequests — max requests per connection (default 100)

References

• Follow-up MVP+1 Create process objects #1
• Watpliwosci: #21a (read timeout), #21c (keep-alive paradox)
• Milestone doc: docs/superpowers/milestone-5/01-http-keepalive.md