#include <ESP8266WiFi.h>

Void loop() {
…
  if (WiFi.status() != WL_CONNECTED) ConnectWifi();
  client = server.available();
  if (client) {
    // HAVE A REQUEST
    while (!client.available()) delay(10);
    String request = client.readStringUntil('\r');
    client.flush();

    // PROCESS REQUEST
  }
  // CONTINUE DOING ALL THE NON-NETWORK STUFF
  sleep(50);   
…
}