528460 - xmlhttprequest.responseText should not been converted charset automatically

Status: RESOLVED INVALID

(Core :: DOM: Core & HTML, defect)

Description

[diyism]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.3a1pre) Gecko/20091112 Minefield/3.7a1pre
Build Identifier: Firefox 2.0- Firefox 3.6

With FF3, when I set the parameter "Accept-Charset" in the header of a request sent by XMLHttpRequest, FF3 replace it by its default value. FF2 and IE is ok with my code.
My code :

Code: Select all
    httprequest=new XMLHttpRequest();
    httprequest.open('GET', "MY_URL", true);
    httprequest.setRequestHeader("Accept-Charset", "ISO-8859-1");
    httprequest.setRequestHeader("PERSONAL_VAR", "value");
    httprequest.send(null);


With Firebug i see the parameter "PERSONAL_VAR" but Accept-Charset = ISO-8859-1,utf-8;q=0.7,*;q=0.7

And the current draft of the W3C XMLHttpRequest specification <http://www.w3.org/TR/XMLHttpRequest/> explicitly forbids setting the Accept header field:

"If the user agent implements server-driven content-negotiation it should set Accept-Language, Accept-Encoding and Accept-Charset headers as appropriate; it must not automatically set the Accept header."

Firefox should not convert my xmlhttprequest.responseText from utf-8 to charset of current page, because xmlhttprequest.responseText is in right the charset of current page, that would make nonsense characters.

Reproducible: Always

Steps to Reproduce:
1.index.php(save as gb2312):
<?
header('Content-Type', 'text/html;charset=gb2312');
echo '<div>中国人都是好样的</div>';
?>

2.test.htm:
<meta content="text/html; charset=GB2312" http-equiv="content-type"/>
<script>
var xhr=new XMLHttpRequest();
xhr.open('GET', 'index.php', true);
xhr.overrideMimeType('text/plain; charset=x-user-defined');
xhr.onreadystatechange=function()
                       {if (xhr.readyState==4)
                           {alert(xhr.responseText);
                           }
                       };
xhr.send('');
</script>
3.the text in alert box:
�й��˶��Ǻ����
Actual Results:  
wrong text:
�й��˶��Ǻ����

Expected Results:  
correct text:
中国人都是好样的

Comment 1

[diyism]

In firefox 3.6.13:

in test.htm, if i write:
xhr.overrideMimeType('text/plain; charset=gb2312');
it works,

but if i don't use overrideMimeType, firefox will take the gb2312 characters from index.php as utf-8 encoded and convert them into rubbish.

Comment 2

[diyism]

Sorry, i made a mistake in php code, it should be:
header('Content-Type:text/html;charset=gb2312');

In firefox 3.6.13:
if i don't set overrideMimeType, firefox can recognize gb2312 characters as gb2312 encoded.

So i close the bug.