Read Value from URL with ESP8266

my friend made a google script, and gave me this link: https://script.google.com/macros/s/AKfycbxxWwU59sp_rF9C6phVIFSdLF6IIM83hFRWUrrJyVI8TdY6F-t1/exec

If you click you will se "52" in your browser. Now I want to create a script in Arduino that can receive this value and use it in order to adjust the amount of light of a LED (code below is without LED part).

I wrote a code:

#include <ESP8266WiFi.h>       
#include <DNSServer.h>
#include <ESP8266WebServer.h>

#include <WiFiClientSecure.h>

const char* ssid = "TabletS3";
const char* password = "123456789";


//https://script.google.com/macros/s/AKfycbxxWwU59sp_rF9C6phVIFSdLF6IIM83hFRWUrrJyVI8TdY6F-t1/exec
WiFiServer server(80);
//String GAS_ID = "AKfycbxxWwU59sp_rF9C6phVIFSdLF6IIM83hFRWUrrJyVI8TdY6F-t1";  // Replace by your GAS service id
const char* host = "script.google.com";
const int httpsPort = 443;
const char* fingerprint = "46 B2 C3 44 9C 59 09 8B 01 B6 F8 BD 4C FB 00 74 91 2F EF F6";
WiFiClientSecure client;


void setup() {

 Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  } 


}

void loop() {
  String url = "https://script.google.com/macros/s/AKfycbxxWwU59sp_rF9C6phVIFSdLF6IIM83hFRWUrrJyVI8TdY6F-t1/exec";


  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               //"User-Agent: BuildFailureDetectorESP8266\r\n" +
               "Connection: close\r\n\r\n");

               Serial.println("Response:");
              while (client.connected())
   {    
  String  line = client.readStringUntil('\r');
    Serial.print(line);
    client.flush();
   }
delay(10000);
}

but I can't read value "52" on Serial Monitor. Where is the mistake?

Thanks in advance, RR

After your insight I tried this:

#include <ESP8266WiFi.h>       
//#include <DNSServer.h>
//#include <ESP8266WebServer.h>

//#include <WiFiClientSecure.h>

const char* ssid = "TabletS3";
const char* password = "123456789";


//https://script.google.com/macros/s/AKfycbxxWwU59sp_rF9C6phVIFSdLF6IIM83hFRWUrrJyVI8TdY6F-t1/exec
//WiFiServer server(80);
//String GAS_ID = "AKfycbxxWwU59sp_rF9C6phVIFSdLF6IIM83hFRWUrrJyVI8TdY6F-t1";  // Replace by your GAS service id
const char* host = "script.google.com";
const int httpsPort = 443;
const char* fingerprint = "46 B2 C3 44 9C 59 09 8B 01 B6 F8 BD 4C FB 00 74 91 2F EF F6";
WiFiClientSecure client;


void setup() {

 Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  } 


}

void loop() {
  String url = "https://script.google.com/macros/s/AKfycbxxWwU59sp_rF9C6phVIFSdLF6IIM83hFRWUrrJyVI8TdY6F-t1/exec";


  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "User-Agent: BuildFailureDetectorESP8266\r\n" +
               "Connection: close\r\n\r\n");

  Serial.println("request sent");
  while (client.connected()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") {
      Serial.println("headers received");
      break;
    }
  }
  String line = client.readStringUntil('\n');
  if (line.startsWith("{\"state\":\"success\"")) {
    Serial.println("esp8266/Arduino CI successfull!");
  } else {
    Serial.println("esp8266/Arduino CI has failed");
  }
  Serial.println("reply was:");
  Serial.println("==========");
  Serial.println(line);
  Serial.println("==========");
  Serial.println("closing connection");
delay(10000);
}

But doesn't catch nothing