438913 - FF produces "no element found" error when fetching JavaScript files using XMLHttpRequest

Status: RESOLVED DUPLICATE of bug 311724

(Core :: XML, defect)

Description

[Godmar Back]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9) Gecko/2008061004 Firefox/3.0
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9) Gecko/2008061004 Firefox/3.0

We use XMLHttpRequest asynchronously from an extension to fetch a .js file.
We use the "If-Modified-Since" header as described here: http://www.w3.org/TR/2006/WD-XMLHttpRequest-20060619/#xmlhttprequest

We see the following error in the log:

Error: no element found
Source File: http://libx.org/libx/src/feeds/root.js
Line: 1

The file itself is not an XML file; see:

about:cache-entry?client=HTTP&sb=1&key=http://libx.org/libx/src/feeds/root.js

key:	http://libx.org/libx/src/feeds/root.js

fetch count:
	

2


last fetched:
	

2008-06-12 15:16:55


last modified:
	

2008-06-12 12:44:10


expires:
	

2008-06-12 12:44:10


Data size:
	

2518


file on disk:
	

none


Security:
	

This document does not have any security info associated with it.




Client:
	

HTTP


request-method:
	

GET


response-head:
	

HTTP/1.1 200 OK
Date: Thu, 12 Jun 2008 16:44:09 GMT
Server: Apache/2.2.8 (Fedora)
Last-Modified: Thu, 12 Jun 2008 15:44:50 GMT
Etag: "3f81da-9d6-44f7a0aa48080"
Accept-Ranges: bytes
Content-Length: 2518
Cache-Control: max-age=1,must-revalidate
Content-Type: application/x-javascript

---

The error is shown after the ".send" request before the readystate callback is shown.  It's as if FF attempts to parse the document as XML.

The error appears to be benign.


Reproducible: Always

Steps to Reproduce:
1.
2.
3.


Expected Results:  
Don't show this message.

This is a low-priority issue since the error appears to not cause any malfunctioning.

I'm using FF3 RC3.

Comment 1

[Godmar Back]

changed to minor

Comment 3

[Godmar Back]

Can you explain what this has to do with bug 311724 ?

We do not use overrideMimetype in our XMLHttpRequest, so we don't ask Firefox to parse it as XML.

Comment 4

[Boris Zbarsky [:bzbarsky]]

Can you please point me to your code in that case?  We only try to parse if the MIME type contains "xml".