ESP8266 reading request from local database - esp8266

Question

I was not to expert with Nodemcu or IOT. I'm trying to read data from database with request by Nodemcu; it works but it showing that I don't want to get.
This is the code:
#include <ESP8266WiFi.h>
const char* ssid = ".....";
const char* password = ".....";
const char* host = "......";
WiFiClient client;
const int httpPort = 8000;
String url;
unsigned long timeout;
void setup() {
Serial.begin(9600);
delay(10);
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void loop() {
Serial.print("connecting to ");
Serial.println(host);
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
//return;
}
url = "/request/55";
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
// Read all the lines of the reply from server and print them to Serial
while(client.available()) {
String a;
a = client.readString();
Serial.println(a);
}
Serial.println();
Serial.println("closing connection");
Serial.println();
}
URL: /request/55 only echo value "12", I'm trying to use client.readString() and this the result :
It is work, but I just only want that value "12". How can I get it?

Answer 1

You're implementing the HTTP protocol yourself. That's why you're getting HTTP headers back. You don't need to do that and probably shouldn't.
Use the ESP8266HTTPClient library. It implements HTTP correctly so that you don't have to. You can find examples at https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266HTTPClient/examples

Answer 2

I found how to get data from database, first you need to change the result from URL. In this condition I change result "12" to "data=12", then on Nodemcu:
while (client.available()) {
String a;
if (client.find("data=") {
a = client.parseInt(a);
Serial.println(a);
}
}
This is the result: