Since the WSA_FLAG_NO_HANDLE_INHERIT is only supported on Windows 7 SP1 and above the socket creation fails on older Windows Systems.
Let's try to create a socket the old way in this case.
Reference:
https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsasocketa
WSA_FLAG_NO_HANDLE_INHERIT:
This flag is supported on Windows 7 with SP1, Windows Server 2008 R2 with SP1, and later
libc++ (the implementation of the C++ standard library usually used by
Clang) throws an exception for the regex used by parse_headers before
this patch for certain strings. Work around this by simplifying the
regex and parsing the header lines "by hand" partially. I have repro'd
this problem with Xcode 11.1 which I believe uses libc++ version 8.
This may be a bug in libc++ as I can't see why the regex would result in
asymptotic run-time complexity for any strings. However, it may take a
while for libc++ to be fixed and for everyone to migrate to it, so it
makes sense to work around it in this codebase for now.
HTTP Whitespace and regex whitespace are not the same, so we can't use
\s in regexes when parsing HTTP headers. Instead, explicitly specify
what is considered whitespace in the regex.
- This compliments the existing `bind_to_any_port()`
where you can determine if the bind succeeded prior
to calling `listen_after_bind()` but allows you to
specify the port.
