javascript - Error 503 (Backend fetch failed) while uploading image -


i want users able upload image files, of them receive error message

failed load resource: server responded status of 503 (backend fetch failed)

here codes

in javascript

function uploadimage() {     if ($("#file").val() != "")         $("#form-upload").submit(); }

in php

if ($_files["file"]["size"] > 0) {     if ($_files["file"]["size"] <= 1024 * 1024 * 5) {         $name = strtotime("now") . "-" . generaterandomstring();         if (move_uploaded_file($_files["file"]["tmp_name"], "../img/backgrounds/" . $name . ".png")) { ?>             <script>window.parent.receiveanswer("success", "./img/backgrounds/<?= $name ?>.png", "<?= $name ?>");</script>         <?php } else {             // upload failed             ?>             <script>window.parent.receiveanswer("error", "upload failed!");</script><?php         }     } else {         // file big         ?>         <script>window.parent.receiveanswer("error", "image big!");</script><?php     } } else {     // file empty     ?>     <script>window.parent.receiveanswer("success", "empty file submitted -> no image");</script><?php }  function generaterandomstring($length = 100) {     $characters = "0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz";     $characterslength = strlen($characters);     $randomstring = "";     ($i = 0; $i < $length; $i++) $randomstring .= $characters[rand(0, $characterslength - 1)];     return $randomstring; }  function isallowedexstension() {  // @todo }

my server running php version 7.0


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