[英]How to find out if a request is an ajax request?
我試圖找出ajax是否發送了對PHP文件的請求。
我用Google搜索並閱讀了一大堆提示以下方法的文章:
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && !empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
echo 'This is an ajax request!';
exit;
}
echo 'This is not an ajax request!';
但我的服務器沒有這個變量: Undefined index: HTTP_X_REQUESTED_WITH ...
多數民眾贊成我如何制作ajax請求:
$.ajax({
url: 'http://URL/test.php',
complete: function(res) {
console.log(res.responseText);
}
});
我正在從另一個網址撥打電話,所以我設置了header('Access-Control-Allow-Origin: *');
我在$_SERVER
發現了一個區別:
Ajax請求: $_SERVER[HTTP_ACCEPT] => */*
沒有Ajax請求: $_SERVER[HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
所以我的問題是,有沒有辦法讓HTTP_X_REQUESTED_WITH
進入$_SERVER
? 如果沒有,是否有正確的方法通過使用$_SERVER[HTTP_ACCEPT]
來確定請求是否為AJAX
沒有100%的方法來檢測請求是否是通過ajax進行的。 即使有人發送標題為“X-Requested-With:XMLHttpRequest”,你也不應該依賴它。
您可以做的是提供您自己定義的變量,並使用命令設計模式來測試結果,例如:
$.ajax({
url: 'http://URL/test.php',
data: {action: "ajax_request"},
complete: function(res) {
console.log(res.responseText);
}
});
和PHP測試:
if (isset($_POST['action']) && !empty($_POST['action'])) {
$action = $_POST['action'];
switch ($action) {
case 'ajax_request' : echo 'This is an ajax request!';
break;
}
}
else
echo 'This is not an ajax request!';
試試這個
while(true)
{
......
if (window.XMLHttpRequest){
echo 'This is an ajax request!';
return new XMLHttpRequest();
}
else if(window.ActiveXObject)// for internet explorer
{
echo 'This is an ajax request'!;
return new ActiveXObject("Microsoft.XMLHTTP");
}
else
echo 'This is not an ajax request!';
}
並非所有瀏覽器都會發送我通常使用的響應
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest') {//Do stuff }
並為ajax
request = $.ajax({
url: SomePage.php,
type: "POST",
data: {key: value}
});
request.done(function(returnedData) {
//do done stuff
});
request.fail(function(jqXHR, textStatus) {
//do fail stuff
});
注意:
$HTTP_SERVER_VARS contains the same initial information, but is not a superglobal.
(Note that $HTTP_SERVER_VARS and $_SERVER are different variables and that
PHP handles them as such). Also note that long arrays were removed since PHP 5.4.0 so
$HTTP_SERVER_VARS doesn't exist anymore.
所以var_dump($HTTP_SERVER_VARS);
要查看它是否包含在那里,還要注意$_SERVER
是由網絡服務器填寫的
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