Function is_connection_error

examples/server/httplib.h:2775–2781

}

inline bool is_connection_error() {
#ifdef _WIN32
  return WSAGetLastError() != WSAEWOULDBLOCK;
#else
  return errno != EINPROGRESS;
#endif
}

inline bool bind_ip_address(socket_t sock, const std::string &host) {
  struct addrinfo hints;