Arduino IDE documentation for WiFi.connected() I'm including this library "ESP8266WiFi.h" at the top of my sketch.
I can find documentation on WiFiServer.available(), but didn't find for WiFi.connected(), which is called in a server sketch after getting the client.

Clearly it's a test whether (once? I believe) the client is connected or not (and hasn't been explicitly closed in the server's side). It may seem obvious but some documented info would be helpful though.
You'll find it defined in WifiClient.h. The version I am using is, in WifiClient.cpp:

uint8_t WiFiClient::connected() {
  if (!_client)
    return 0;
  return _client-&gt;state() == ESTABLISHED || available();
}