*) allow file existence test for POST requests in static module
*) do not discard body while error_page redirection

ignore NGX_EACCES error while directory test

fix error when response parsed by sub filter, then by SSI filter
and some response parts are output as file buffers

ssl_session_cache none

expires modified

$uid_got and $uid_set may used at any time

escape 0x00-0x1f, ", and \ in access log variables

*) host in request line has priority
*) allow several Host headers
*) validate host

style fixes