How to set up Ajax to achieve cross-domain access
This time I will show you how to set up Ajax to achieve cross-domain access. What are the precautions for setting up Ajax to achieve cross-domain access? The following is a practical case, let's take a look.
ajax cross-domain access is an old problem. There are many solutions. The more commonly used method is the JSONP method. The JSONP method is an unofficial method, and this method only supports the GET method, which is not as safe as the POST method. Even if you use the jsonp method ofjQuery and set the type to POST, it will automatically change to GET.
Official problem description: “script”: Evaluates the response asJavaScript and returns it as plain text. Disables caching by appending a query string parameter, “_=[TIMESTAMP]“, to the URL unless the cache option is set to true.Note: This will turn POSTs into GETs for remote-domain requests.
if To use the POST method across domains, you can create a hidden iframe to achieve the same principle as ajax uploading images, but this will be more troublesome. Therefore, it is relatively simple to achieve cross-domain access by settingAccess-Control-Allow-Origin.
For example: the client's domain name is www.client.com, and the requested domain name is www.server.comIf you directly use ajax to access, there will be the following error XMLHttpRequest cannot load http://www.server.com/server.PHP. No 'Access-Control-Allow-Origin' header is present on the requestedresource.Origin 'http://www.client .com' is therefore not allowed access.
Ajax POST cross-domain access can be achieved by adding// 指定允许其他域名访问
header('Access-Control-Allow-Origin:*');
// 响应类型
header('Access-Control-Allow-Methods:POST');
// 响应头设置
header('Access-Control-Allow-Headers:x-requested-with,content-type');<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title> 跨域测试 </title>
<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
</head>
<body>
<p id="show"></p>
<script type="text/javascript">
$.post("http://www.server.com/server.php",{name:"fdipzone",gender:"male"})
.done(function(data){
document.getElementById("show").innerHTML = data.name + ' ' + data.gender;
});
</script>
</body>
</html><?php
$ret = array(
'name' => isset($_POST['name'])? $_POST['name'] : '',
'gender' => isset($_POST['gender'])? $_POST['gender'] : ''
);
header('content-type:application:json;charset=utf8');
header('Access-Control-Allow-Origin:*');
header('Access-Control-Allow-Methods:POST');
header('Access-Control-Allow-Headers:x-requested-with,content-type');
echo json_encode($ret);
?>Specify a domain name to allow it For cross-domain access, just change Access-Control-Allow-Origin:* to Access-Control-Allow-Origin:allowed domain names
For example: header('Access-Control- Allow-Origin:http://www.client.com');If you needSet multiple domain namesto allow access, you need to use php to process it
For example Allow www.client.com and www.client2.com to have cross-domain access server.php modified to<?php
$ret = array(
'name' => isset($_POST['name'])? $_POST['name'] : '',
'gender' => isset($_POST['gender'])? $_POST['gender'] : ''
);
header('content-type:application:json;charset=utf8');
$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';
$allow_origin = array(
'http://www.client.com',
'http://www.client2.com'
);
if(in_array($origin, $allow_origin)){
header('Access-Control-Allow-Origin:'.$origin);
header('Access-Control-Allow-Methods:POST');
header('Access-Control-Allow-Headers:x-requested-with,content-type');
}
echo json_encode($ret);
?>Source code download address: http://xiazai.jb51.net/201702/yuanma/demo(jb51.net)
The following are the additions from other netizens:When I was using cocos2d-js to make games recently,An error occurs when using ajax cross-domain access request locally:
Using Ajax to implement registration and avatar upload functions
The above is the detailed content of How to set up Ajax to achieve cross-domain access. For more information, please follow other related articles on the PHP Chinese website!
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