利用ajax+xml来获取http header
将下面的代码写到xxx.html中，打开后就可以输入url，就获得相应的http header。
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style type="text/css">
a{color:#0000FF;}
</style>
<title>Your title</title>
<script type="text/javascript" language="javascript">
var request = false;
function createRequest(){
try{
request = new XMLHttpRequest();
}catch(trymicrosoft){
try{
request = new ActiveXObject("Msxml2.XMLHTTP");
}catch(othermicrosoft){
try{
request = new ActiveXObject("Microsoft.XMLHTTP");
}catch(failed){
request = false;
alert("failed");
}
}
}
}
function getReturn(){
createRequest();
var url = document.getElementById("url").value;
if( url == null || url == "" ){
alert("url should not be blank");
return;
}
var re = new RegExp(/^http/);
var is_http = url.match(re);
if( is_http == null ){
url = "http://" + url;
}
request.open("HEAD",url,true);
request.onreadystatechange = updatePage;
request.send(null);
}
function updatePage(){
if(request.readyState == 4 ){
var value = request.getAllResponseHeaders();
document.getElementById("result").value = value;
}
}
</script>
</head>
<body bgcolor=ffffff>
<form>
<p>Enter your url:
<input type="text" size=40 name="inputurl" id="url"
onChange="getReturn();"/>
<label>>>[click here]<<</label>
</p>
</form>
<p>Http Header:<br/>
<textarea name="outputresult" id="result" rows=12 cols=40></textarea>
</p>
</body>
</html>
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