[英]No 'Access-Control-Allow-Origin' header is present on the requested resource error
[英]Error No 'Access-Control-Allow-Origin' header is present on the requested resource
我正在嘗試使用XMLHttpRequest在遠程計算機上進行生物特征認證。 但它返回以下消息:
XMLHttpRequest無法加載http://177.55.99.146:8080/autenticacao/autentica?arquivo=[object%20File] 。 所請求的資源上沒有“ Access-Control-Allow-Origin”標頭。 因此,不允許訪問來源“ http://www.yaratecnologia.com.br ”
代碼如下。..有人知道錯誤在哪里嗎? 我該怎么辦?
<?php
// Allow from any origin
if (isset($_SERVER['HTTP_ORIGIN'])) {
header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
header('Access-Control-Allow-Credentials: true');
header('Access-Control-Max-Age: 86400'); // cache for 1 day
}
// Access-Control headers are received during OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
header("Access-Control-Allow-Methods: GET, POST, OPTIONS");
if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");
exit(o);
}
echo "You have CORS!";
?>
<script type="text/javascript">
function autenticarbiometria() {
var fileInput = document.getElementById('fileInput');
var file = fileInput.files[0];
var reader = new FileReader();
var campo = "";
var status = "f";;
if (file.size != 400) {
alert("ATENÇÃO --> O arquivo selecionado NÃO está em um formato Biométrico válido!");
return false;
}
if (!confirm("CONFIRMA AUTENTICAÇÃO BIOMÉTRICA NA BASE DE DADOS?")) {
return false;
}
if(window.XMLHttpRequest) {
req = new XMLHttpRequest();
}
else if(window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
// Arquivo PHP juntamente com o valor digitado no campo (metodo GET)
var url = "http://177.55.99.146:8080/autenticacao/autentica?arquivo="+file;
// Chamada do metodo open para processar a requisicao
req.open("GET",url,true);
req.send(null);
// Quando o objeto recebe o retorno, chamamos a seguinte funcao
req.onreadystatechange = function() {
alert("Retorno do readyState == " + req.readyState + " readyStatus == " + req.status);
if(req.readyState == 4 && req.status == 200) {
// Resposta retornada pelo busca.php
var resposta = req.responseText;
alert("ATENÇÃO --> RETORNO AUTENTICACAO = " + resposta);
}
}
}
</script>
您的摘要有些混亂。 如果整個代碼都屬於同一頁面,則似乎您已在本地計算機上啟用了CORS,而必須在您要使用的遠程服務器上設置Access-Control-Allow-Origin
。
您應該通過設置正確的Access-Control-Allow-Origin
標頭來更改遠程服務器上的代碼,或者,如果不可能,則應該從PHP(服務器端)執行身份驗證。
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