Value sensor data esp8266 cannot post to 000webhost database

Hallo. i used esp8266 and gps modul. the value data sensor can insert into local database. but when i try to post value data to 000webhost database. the value cannot insert and i got error on serial monitor "500 Internal Server Error". may you help me to solve my error?

there is my arduino ide code:

#include <TinyGPS++.h> // library for GPS module
#include <SoftwareSerial.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <SPI.h>

SoftwareSerial gpsSerial(4,5);//rx,tx The serial connection to the GPS device
TinyGPSPlus gps;  // The TinyGPS++ object
//SoftwareSerial ss(4, 5); // 

const char* ssid = "myssid"; //ssid of your wifi
const char* password = "mypass"; //password of your wifi 
const char* host = "https://coba.000webhostapp.com"; 

float latitude = 20;
float longitude = 20;

WiFiClient client;

void setup(){
  
 Serial.begin(115200);
 delay(10);
 Serial.begin(9600);
 gpsSerial.begin(9600); // connect gps sensor
  // Connect to WiFi network
 Serial.println();
 Serial.println();
 Serial.print("Connecting to ");
 Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
 
  // Start the server
//server.begin();
  Serial.println("Server started");
  Serial.print(WiFi.localIP());
  delay(1000);
  Serial.println("connecting...");
 }
 

void loop(){

  while(1)
  {
   while (gpsSerial.available() > 0)
    { gps.encode(gpsSerial.read()); }

      if (gps.location.isUpdated())
      {
       latitude=gps.location.lat();
       longitude=gps.location.lng();
       break;
      }

 }
   Serial.print("LATITUDE="); Serial.println(latitude,6);
   Serial.print("LONGITUDE="); Serial.println(longitude,6);
   delay(1000);
   
   if(!client.connect(host, 80)){
     Serial.println("connection Failed");
     return;  
  }
   //Creating URI
  String url = "/coba.php?";
         url += "latitude=";
         url += latitude;
         url += "&longitude=";
         url += longitude;

  Serial.print("Requesting URL :");
  Serial.println(url);

 //This will send the request to the server and print them
  client.print(String("GET /") + url + "HTTP/1.1\r\n" + 
               "HOST :" + host + "\r\n" +
               "Connection: close \r\n\r\n");
                
              //"Accept: *" + "/" + "*\r\n" +
              //"Content-Length: " + latitude.length() + longitude.length() +"\r\n" +
              //"Content-Type: aplication/x-www-form-urlencoded\r\n" + 
              

  unsigned long timeout = millis();             
  while(client.available() == 0){
     if(millis() - timeout > 5000){
      Serial.println(">>>Client Timeout");
      client.stop();
      return;
      }
  }

  while(client.available()){
     String line = client.readStringUntil('\r');
     Serial.print(line);
  }
  Serial.println();
  Serial.println("Closing Connection");

 delay(10000);
}

there is my php code:

<?php
  $latitude = (float) $_GET['latitude'];
  $longitude = (float) $_GET['longitude'];
  
 $servername = "localhost";
$username = "myusername";
$password = "mypass";
$database = "mydb";

try {
    $connect = new PDO("$servername, $dbname", $username, $password);
    // set the PDO error mode to exception
    $connect->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql = "INSERT INTO lokasi (latitude, longitude)
    VALUES ('".$latitude."', '".$longitude."')";
    // use exec() because no results are returned
    $connect->exec($sql);
    echo "New record created successfully";
    }
catch(PDOException $e)
    {
    echo $sql . " " . $e->getMessage();
    }

$connect = null;

?>