Lighttpd

server.max-write-idle option¶

server.max-write-idle
maximum number of seconds until a waiting write call times out and closes the connection
Default: 360
maximum value is 65535, which is about 3/4 day

If you get warnings like this in the error log:

'NOTE: a request for ... timed out after writing xxxxx bytes. We waited 360 seconds. If this a problem increase server.max-write-idle'

It's most likely caused by slow client connections. Apparently a client requested a file and lighttpd did not complete serving this file. This happens when the client's connection drops or the client is really slow. In this case there's no real need to adjust the server.max-write-idle option.