allow reuse of tcp connection to send multiple request to one server

add writeToStream function for easy payload usage

libraries/ESP8266httpClient/examples/reuseConnection/reuseConnection.ino

@@ -0,0 +1,65 @@
+/**
+ * reuseConnection.ino
+ *
+ *  Created on: 22.11.2015
+ *
+ */
+
+
+#include <Arduino.h>
+
+#include <ESP8266WiFi.h>
+#include <ESP8266WiFiMulti.h>
+
+#include <ESP8266httpClient.h>
+
+#define USE_SERIAL Serial1
+
+ESP8266WiFiMulti WiFiMulti;
+
+httpClient http;
+
+void setup() {
+
+    USE_SERIAL.begin(115200);
+   // USE_SERIAL.setDebugOutput(true);
+
+    USE_SERIAL.println();
+    USE_SERIAL.println();
+    USE_SERIAL.println();
+
+    for(uint8_t t = 4; t > 0; t--) {
+        USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);
+        USE_SERIAL.flush();
+        delay(1000);
+    }
+
+    WiFiMulti.addAP("SSID", "PASSWORD");
+
+
+}
+
+void loop() {
+    // wait for WiFi connection
+    if((WiFiMulti.run() == WL_CONNECTED)) {
+
+        http.begin("192.168.1.12", 80, "/test.html");
+
+        int httpCode = http.GET();
+        if(httpCode) {
+            USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);
+
+            // file found at server
+            if(httpCode == 200) {
+                http.writeToStream(&USE_SERIAL);
+            }
+        } else {
+            USE_SERIAL.print("[HTTP] GET... faild, no connection or no HTTP server\n");
+        }
+    }
+
+    delay(1000);
+}
+
+
+