implement most nsapi expression operators

fix cgi stderr logger + reuse stderr tmp buffer

fix cgi pipes not closed in some error case + minor improvements

improve http listener migration / shutdown of old listener

use separate buffer for chunked transfer encoding, not inbuf

add missing init_logging declaration

implement acceptor thread shutdown

(0) -300 -100 -30 -10 -7 +7 +10 +30 tip

mercurial