AJAX(XMLHttpRequest)进行跨域请求方法详解(三)
www.jz123.cn 2010-01-14 来源: 中国建站 孟宪会 我要投递新闻
3,带验证信息的请求
身份验证是Web开发中经常遇到的问题,在跨域请求中,默认情况下是不发送验证信息的。要想发送验证信息,需要进行withCredentials 属性,下面就是一个简单请求的例子:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>孟宪会之AJAX跨域请求测试</title> </head> <body> <input type='button' value='开始测试' nclick='crossDomainRequest()' /> <div id="content"></div>
<script. type="text/javascript"> //<![CDATA[ var xhr = new XMLHttpRequest(); var url = 'http://dotnet.aspx.cc/RequestsWithCredentials.aspx'; function crossDomainRequest() { document.getElementById("content").innerHTML = "开始进行请求……"; if (xhr) { xhr.open('GET', url, true); xhr.onreadystatechange = handler; xhr.withCredentials = "true"; xhr.send(); } else { document.getElementById("content").innerHTML = "不能创建 XMLHttpRequest。"; } } function handler(evtXHR) { if (xhr.readyState == 4) { if (xhr.status == 200) { var response = xhr.responseText; document.getElementById("content").innerHTML = "结果:" + response; } else { document.getElementById("content").innerHTML += "<br/>执行状态 status:" + xhr.status; } } else { document.getElementById("content").innerHTML += "<br/>执行状态 readyState:" + xhr.readyState; } } //]]> </script>
</body> </html>
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点击“开始测试”,我们可以检测到下面的请求执行过程:
GET /RequestsWithCredentials.aspx HTTP/1.1 Host: dotnet.aspx.cc User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 (.NET CLR 3.5.30729) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: zh-cn,zh;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Referer: http://www.meng_xian_hui.com:801/CrossDomainAjax/RequestsWithCredentials.html Origin: http://www.meng_xian_hui.com:801
HTTP/1.x 200 OK Date: Sun, 10 Jan 2010 14:12:26 GMT Server: Microsoft-IIS/6.0 X-Powered-By: ASP.NET X-AspNet-Version: 2.0.50727 Access-Control-Allow-Origin: http://www.meng_xian_hui.com:801 Access-Control-Allow-Credentials: true Set-Cookie: ASP.NET_SessionId=fn2zf0zq1cuwgf45fm5fw145; path=/; HttpOnly Set-Cookie: visit=1; expires=Sun, 10-Jan-2010 14:12:56 GMT; path=/ Cache-Control: no-cache Pragma: no-cache Expires: -1 Content-Type: text/html; charset=utf-8 Content-Length: 1
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从上面的响应中可以看出,Cookie 是会随请求一起发送的。如果我们多次点击测试按钮,则可以看到请求和响应的结果是这样的:
GET /RequestsWithCredentials.aspx HTTP/1.1 Host: dotnet.aspx.cc User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; zh-CN; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 (.NET CLR 3.5.30729) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: zh-cn,zh;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: GB2312,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Referer: http://www.meng_xian_hui.com:801/CrossDomainAjax/RequestsWithCredentials.html Origin: http://www.meng_xian_hui.com:801 Cookie: ASP.NET_SessionId=fn2zf0zq1cuwgf45fm5fw145; visit=2
HTTP/1.x 200 OK Date: Sun, 10 Jan 2010 14:13:58 GMT Server: Microsoft-IIS/6.0 X-Powered-By: ASP.NET X-AspNet-Version: 2.0.50727 Access-Control-Allow-Origin: http://www.meng_xian_hui.com:801 Access-Control-Allow-Credentials: true Set-Cookie: visit=3; expires=Sun, 10-Jan-2010 14:14:28 GMT; path=/ Cache-Control: no-cache Pragma: no-cache Expires: -1 Content-Type: text/html; charset=utf-8 Content-Length: 1
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注意 Cookie: ASP.NET_SessionId=fn2zf0zq1cuwgf45fm5fw145; visit=2 这一行,访问计数器已经被一起发送到服务器。
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