Method send_

examples/server/httplib.h:6370–6457

}

inline bool ClientImpl::send_(Request &req, Response &res, Error &error) {
  {
    std::lock_guard<std::mutex> guard(socket_mutex_);

    // Set this to false immediately - if it ever gets set to true by the end of
    // the request, we know another thread instructed us to close the socket.
    socket_should_be_closed_when_request_is_done_ = false;

    auto is_alive = false;
    if (socket_.is_open()) {
      is_alive = detail::is_socket_alive(socket_.sock);
      if (!is_alive) {
        // Attempt to avoid sigpipe by shutting down nongracefully if it seems
        // like the other side has already closed the connection Also, there
        // cannot be any requests in flight from other threads since we locked
        // request_mutex_, so safe to close everything immediately
        const bool shutdown_gracefully = false;
        shutdown_ssl(socket_, shutdown_gracefully);
        shutdown_socket(socket_);
        close_socket(socket_);
      }
    }

    if (!is_alive) {
      if (!create_and_connect_socket(socket_, error)) { return false; }

#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
      // TODO: refactoring
      if (is_ssl()) {
        auto &scli = static_cast<SSLClient &>(*this);
        if (!proxy_host_.empty() && proxy_port_ != -1) {
          auto success = false;
          if (!scli.connect_with_proxy(socket_, res, success, error)) {
            return success;
          }
        }

        if (!scli.initialize_ssl(socket_, error)) { return false; }
      }
#endif
    }

    // Mark the current socket as being in use so that it cannot be closed by
    // anyone else while this request is ongoing, even though we will be
    // releasing the mutex.
    if (socket_requests_in_flight_ > 1) {
      assert(socket_requests_are_from_thread_ == std::this_thread::get_id());
    }
    socket_requests_in_flight_ += 1;
    socket_requests_are_from_thread_ = std::this_thread::get_id();
  }

  for (const auto &header : default_headers_) {
    if (req.headers.find(header.first) == req.headers.end()) {
      req.headers.insert(header);
    }
  }