XMLHTTPREQUEST can cache the content??? Need help

**alicenan88** · 2009-11-05, 09:07

Hello everyone:

I just found a relly funny problem on my Widget.

When I use javascript to connect on local port like 127.0.0.1:8889, I have another symbian C++ send sth to this port. It works fine. But when I want to update the content for this port, the previous still there!!!! How this happened???

Even I reboot the machine, the content still on that port,when I get content by XMLhttprequest. How this happened? Anyone help me? Because I want to instanly update the content to that port!!

Anyone encounter this funny thing???
Who knows why the XMLhttprequest can save the content of last time? For example. the first time I use http://127.0.0.1:8888/xxx.xml, it works fine, but when I update the xxx.xml, it still get the content before updating. Even after I restart my 5800, the XMLhttprequest.open still can works!!!!!! how?

This situation not exists in emulator.

the first time , I request the content in
http://127.0.0.1:8888/123.xml
then I updated the 123.xml
the second time, I request again to the new content,but I can not get the updated content,still the previous one

It works fine in Emulator,that I can receive F and F1 seperately, but not works on 5800 machine,I can only receive the F.it looks like there is a cache in the XMLhttprequest.open that all of the request with the same name just lead to the previous exist content.

----------------Here is the code----------------------------

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script language="JavaScript">
var xmlHttp = null;
function openConnection(){
try {
xmlHttp = new XMLHttpRequest;
xmlHttp.onreadystatechange = httpCallBack;
var url_frame = "http://127.0.0.1:8889/jjj.xml";
xmlHttp.open('GET', url_frame, false);
xmlHttp.send(null);
}
catch (e) {
}
}

function comeon(){
document.getElementById("to").innerHTML="jjj";

}

function httpCallBack()
{

if(xmlHttp.readyState != 4)
{

}
if ((xmlHttp.readyState == 4 )&&(xmlHttp.status == 200)) {

try
{
var resultXml = xmlHttp.responseText;

if(!resultXml){}
else
{ document.getElementById("do").innerHTML=resultXml;
var newdiv = document.getElementById("atom");

newdiv.innerHTML = xmlHttp.responseXML;
document.getElementById("to").innerHTML= resultXml.getElementsByTagName("to")[0].childNodes[0].nodeValue;

}
}
catch (e)
{

}
}
}

</script>

</head>

<body id="body">

<div id="go Peek">
<div id="greetingText">Welcome to Peek<br/>
<a class="link" href="javascript:comeon();">Click me</a>
</div>
</div>
<div id="atom"></div>
<p><b>To:</b> <span id="to"></span><br />
<p><b>Do:</b> <span id="do"></span><br />
<div>
<input type="button" value="PEEK GO" onClick="openConnection();" />

</div>
</body>
</html>

**ltomuta** · 2009-11-05, 09:44

Originally Posted by alicenan88

Hello everyone:

I just found a relly funny problem on my Widget.

What do you mean "just found"? You had the exact same thing posted yesterday. It's probably my fault but you have learned nothing from our previous discussion. You don't show any logs here, you don't add anything new to help one understand your problem ... Nothing. Just a copy of the original post.

If your problem is with your widget code you should post this in the WRT Widgets forum. After all, there's no connection between JavaScript and Symbian C++.

Originally Posted by alicenan88

When I use javascript to connect on local port like 127.0.0.1:8889, I have another symbian C++ send sth to this port. It works fine. But when I want to update the content for this port, the previous still there!!!! How this happened???

Even I reboot the machine, the content still on that port,when I get content by XMLhttprequest. How this happened? Anyone help me? Because I want to instanly update the content to that port!!

Anyone encounter this funny thing???
Who knows why the XMLhttprequest can save the content of last time? For example. the first time I use http://127.0.0.1:8888/xxx.xml, it works fine, but when I update the xxx.xml, it still get the content before updating. Even after I restart my 5800, the XMLhttprequest.open still can works!!!!!! how?

This situation not exists in emulator.

the first time , I request the content in
http://127.0.0.1:8888/123.xml
then I updated the 123.xml
the second time, I request again to the new content,but I can not get the updated content,still the previous one

It works fine in Emulator,that I can receive F and F1 seperately, but not works on 5800 machine,I can only receive the F.it looks like there is a cache in the XMLhttprequest.open that all of the request with the same name just lead to the previous exist content.

----------------Here is the code----------------------------

PHP Code:


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>

<head>

<script language="JavaScript">

var xmlHttp = null;

function openConnection(){

try {

xmlHttp = new XMLHttpRequest;

xmlHttp.onreadystatechange = httpCallBack;

var url_frame = "http://127.0.0.1:8889/jjj.xml";

xmlHttp.open('GET', url_frame, false);

xmlHttp.send(null);

}

catch (e) {

}

}





function comeon(){

document.getElementById("to").innerHTML="jjj";





}





function httpCallBack()

{



if(xmlHttp.readyState != 4)

{



}

if ((xmlHttp.readyState == 4 )&&(xmlHttp.status == 200)) {



try

{

var resultXml = xmlHttp.responseText;



if(!resultXml){}

else

{ document.getElementById("do").innerHTML=resultXml;

var newdiv = document.getElementById("atom");



newdiv.innerHTML = xmlHttp.responseXML;

document.getElementById("to").innerHTML= resultXml.getElementsByTagName("to")[0].childNodes[0].nodeValue;



}

}

catch (e)

{



}

}

}



</script>





</head>



<body id="body">



<div id="go Peek">

<div id="greetingText">Welcome to Peek<br/>

<a class="link" href="javascript:comeon();">Click me</a>

</div>

</div>

<div id="atom"></div>

<p><b>To:</b> <span id="to"></span><br />

<p><b>Do:</b> <span id="do"></span><br />

<div>

<input type="button" value="PEEK GO" onClick="openConnection();" />



</div>

</body>

</html>

**alicenan88** · 2009-11-05, 11:15

But your answer for the post yesterday is "I have no idea"

Thank you for your help yesterday. But I may submit it again to ask help from others. is it make sense?

**ltomuta** · 2009-11-05, 12:02

The old thread is still there, if somebody has something to add can do it. At best you may want to post this on the WRT Widgets forum where it will be seen by those working with XMLHttpRequest ...

But actually I had a couple of ideas in that other thread, like setting the content expiration date on the HTTP headers and reading the documentation on XMLHttpRequest for any info regarding caching. Have you done anything about that?

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