ESP8266 NodeMCU Lolin V3 and using Firebase to update its software OTA

Question

I want to update software OTA on multiple of my nodemcu devices that are currently sending data to my firebase database. I found this tutorial (https://medium.com/firebase-developers/over-the-air-arduino-firmware-updates-using-firebase-part-1-3e874ad9f93e) for ESP32 and tried adapting it to work with one of my nodemcu however it writes no binary and "gives up". I am not sure why/how to modify the code further. I am currently running core 2.7.4 as upgrading does not allow me to upload code to my nodemcu.

I have attached part of my code below and output I get in serial monitor. I am able to connect to wifi, change my "updatebit", and send data to firebase so there is no issue there.

#include <Firebase.h>
#include <FirebaseArduino.h>
#include <FirebaseCloudMessaging.h>
#include <FirebaseError.h>
#include <FirebaseHttpClient.h>
#include <FirebaseObject.h>

//#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>

#include "Updater.h"
#include "ESP8266WiFi.h"
#include "ESP8266HTTPClient.h"

#define FIREBASE_HOST "..."
#define FIREBASE_AUTH "..."

#define FIRMWARE_URL \
"http://..."
HTTPClient http;

void setup() {
....
}
void loop() {
  if(updatebit==1){
    updateFirmware();
  } else {
  }
}

void updateFirmware() {
  // Start pulling down the firmware binary.

  http.begin(FIRMWARE_URL);
  int httpCode = http.GET();
  if (httpCode <= 0) {
    Serial.printf("HTTP failed, error: %s\n", 
       http.errorToString(httpCode).c_str());
    return;
  }
  // Check that we have enough space for the new binary.
  int contentLen = http.getSize();
  Serial.printf("Content-Length: %d\n", contentLen);
  bool canBegin = Update.begin(contentLen);
  if (!canBegin) {
    Serial.println("Not enough space to begin OTA");
    return;
  }
  // Write the HTTP stream to the Update library.
  WiFiClient* client = http.getStreamPtr();
  size_t written = Update.writeStream(*client);
  Serial.printf("OTA: %d/%d bytes written.\n", written, contentLen);
  if (written != contentLen) {
    Serial.println("Wrote partial binary. Giving up."); //content length printed in serial 
monitor is 42 but 0/42 bytes are written and it says "Wrote partial binary. Giving up."
    return;
  }
  if (!Update.end()) {
    Serial.println("Error from Update.end(): " + 
      String(Update.getError()));
    return;
  }
  if (Update.isFinished()) {
    Firebase.setInt("updatebit",0);
    Serial.println("Update successfully completed. Rebooting."); 
    // This line is specific to the ESP32 platform:
    ESP.restart();
  } else {
    Serial.println("Error from Update.isFinished(): " + 
      String(Update.getError()));
    return;
  }
}

If I add the "s" in http changing from

#define FIRMWARE_URL \
"http://..."

to

#define FIRMWARE_URL \    
"https://..."

I get "HTTP failed, error: connection failed" in serial monitor