esp8266/libraries/ESP8266HTTPClient/examples/ReuseConnection/ReuseConnection.ino

/**
   reuseConnection.ino

    Created on: 22.11.2015

*/


#include <Arduino.h>

#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>

#include <ESP8266HTTPClient.h>

ESP8266WiFiMulti WiFiMulti;

HTTPClient http;

void setup() {

  Serial.begin(115200);
  // Serial.setDebugOutput(true);

  Serial.println();
  Serial.println();
  Serial.println();

  for (uint8_t t = 4; t > 0; t--) {
    Serial.printf("[SETUP] WAIT %d...\n", t);
    Serial.flush();
    delay(1000);
  }

  WiFi.mode(WIFI_STA);
  WiFiMulti.addAP("SSID", "PASSWORD");

  // allow reuse (if server supports it)
  http.setReuse(true);
}

void loop() {
  // wait for WiFi connection
  if ((WiFiMulti.run() == WL_CONNECTED)) {

    WiFiClient client;

    http.begin(client, "http://jigsaw.w3.org/HTTP/connection.html");
    //http.begin(client, "jigsaw.w3.org", 80, "/HTTP/connection.html");

    int httpCode = http.GET();
    if (httpCode > 0) {
      Serial.printf("[HTTP] GET... code: %d\n", httpCode);

      // file found at server
      if (httpCode == HTTP_CODE_OK) {
        http.writeToStream(&Serial);
      }
    } else {
      Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
    }

    http.end();
  }

  delay(1000);
}