本文通过设置Access-Control-Allow-Origin来实现跨域。
例如:客户端的域名是client.cdsy.xyz,而请求的域名是server.cdsy.xyz。
如果直接使用ajax访问,会有以下错误:
XMLHttpRequest cannot load http://server.cdsy.xyz/server.php. No 'Access-Control-Allow-Origin' header is present on the requested resource.Origin 'http://client.cdsy.xyz' is therefore not allowed access.
指定某域名(http://client.cdsy.xyz)跨域访问,则只需在http://server.cdsy.xyz/server.php文件头部添加如下代码:
header('Access-Control-Allow-Origin:http://client.cdsy.xyz');
指定多个域名(http://client1.cdsy.xyz、http://client2.cdsy.xyz等)跨域访问,则只需在http://server.cdsy.xyz/server.php文件头部添加如下代码:
$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';
$allow_origin = array(
'http://client1.cdsy.xyz',
'http://client2.cdsy.xyz'
);
if(in_array($origin, $allow_origin)){
header('Access-Control-Allow-Origin:'.$origin);
}
允许所有域名访问则只需在http://server.cdsy.xyz/server.php文件头部添加如下代码:
header('Access-Control-Allow-Origin:*');