Arduino:
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#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>

const char* ssid = "yourSSID";
const char* password = "yourPASSWORD";

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  Serial.println("Connected to WiFi");
  
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin("http://example.com"); //Your URL
    int httpCode = http.GET();

    if (httpCode > 0) {
      String payload = http.getString();
      Serial.println(httpCode);
      Serial.println(payload);
    } else {
      Serial.println("Error in HTTP request");
    }
    http.end();
  }
}

void loop() {
  // nothing here
}