URL blocked ( Access-Control-Allow-Origin - Missing Header) while I am trying to get the data from Bluehost to react website app

I am creating a website using (react for website) that I wanted to get the data from my server in blueHost using php as a backend and react (JavaScript) as front-end

I have an issue that I am not able to load the data case of my file.php has blocked because of Access control allow Origin

any idea how can solve this issue?

here is my code app.js (react)

    const getData = async () => {
    fetch(URL,{
      mode:'cors',
      headers : {
        'Content-Type' : 'application/x-www-form-urlencoded; charset=UTF-8',
  'Access-Control-Allow-Origin': '*',
    'Access-Control-Allow-Origin': 'http://localhost:3004',
    'Access-Control-Allow-Methods': 'GET',
    'Content-type': 'application/json; charset=UTF-8',
    'Access-Control-Allow-Headers':'Origin, X-Requested-With, Content-Type, Accept',
    'Access-Control-Request-Headers': 'x-token'
    }
    })
    .then((response) => response.json())
    .then((json) => console.log(json.flags))
    .catch((error) => console.log(error))
    .finally(() => console.log(false));

}

and here is my file.php

 <?php
include 'DBConfig.php';
 
$conn = new mysqli($HostName, $HostUser, $HostPass, $DatabaseName);
header('Access-Control-Allow-Origin: *');
header("Access-Control-Allow-Methods: GET, POST, OPTIONS, PUT, DELETE");
header("Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, X-Requested-With");

$json = file_get_contents('php://input');
$obj = json_decode($json, true);

if ($conn->connect_error) {
 
 die("Connection failed: " . $conn->connect_error);
}
 
$sql = "SELECT * FROM `Transactions`";
 
$result = $conn->query($sql);
 
if ($result->num_rows >0) {
 
 
 while($row[] = $result->fetch_assoc()) {
 
 $tem = $row;
 
 $json = json_encode($tem);
 
 
 }
} else {
    $json = json_encode("false");

}
 echo $json;
$conn->close();
?>

any idea how can I solve this issue?

source https://stackoverflow.com/questions/70266139/url-blocked-access-control-allow-origin-missing-header-while-i-am-trying-to