Improve handling of Sec-WebSocket-Protocol: binary, base64 for RFC6455.
When client sends Sec-WebSocket-Protocol in request header, client
may expect Sec-WebSocket-Protocol response. mod_wstunnel is basic
tunnel endpoint and supports "binary" and "text" modes for RFC6455,
conventionally requested by client browsers as "binary" or "base64"
provide standard types in first.h instead of base.h
provide lighttpd types in base_decls.h instead of settings.h
reduce headers exposed by headers for core data structures
do not expose <pcre.h> or <stdlib.h> in headers
move stat_cache_entry to stat_cache.h
reduce use of "server.h" and "base.h" in headers
fdevent_accept_listenfd() now always returns fd O_NONBLOCK O_CLOEXEC
for consistency, rather than setting elsewhere in connection_accepted()
Handle older Linux 2.6 kernels which might have accept4() in glibc,
but return ENOSYS, as accept4() was not added until Linux kernel 2.6.28.
fix segfault in reverse url-path mapping of Set-Cookie sent from backend
when proxy.header = ( "map-urlpath" => ( ... ) ) is used and there are
multiple Set-Cookie response headers with path= attributes which need to
be reverse mapped.
"Segfault with proxy-header map-urlpath"
Allowing explicit IPs to be rejected might be useful in situations
where an internal network is to be allowed by CIDR mask, but there are
a small number of untrusted hosts on the network, e.g. hosts behind a
NAT to which some external ports are forwarded.
CIDR masks must be marked "trust", or else are ignored with a warning.
"RFE: mod_extforward CIDR support"
Although removal of AM_PROG_CC_C_O in f107bac8 requires automake 1.14
to provide the same functionality in AC_PROG_CC, any widely used,
modern compiler supports cc -c -o. Reducing the minimum required
automake version avoids the current need for Centos 7 maintainers
to patch configure.ac in order to build binary packages.