409230 - Error Console gives "not well-formed" message when extension uses Ajax to grab text file

Status: RESOLVED DUPLICATE of bug 311724

(Toolkit Graveyard :: Error Console, defect)

Description

[Brett Zamir]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b2) Gecko/2007121120 Firefox/3.0b2
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b2) Gecko/2007121120 Firefox/3.0b2

The Error Console gives "not well-formed" messages when my extension (Unicode Input Tool/Converter) uses Ajax to retrieve data from a plain text file (.txt) and used with responseText.

Reproducible: Always

Steps to Reproduce:
1. Use chart view (in Unicode Input Tool/Converter extension at https://addons.mozilla.org/en-US/firefox/addon/5235 )
2. Hover mouse over a chart item to trigger Ajax to retrieve via responseText from the file Unihan.txt
3. Watch the Error Console spit out the errors
Actual Results:  
Error: not well-formed
Source File: file:///C:/Documents%20and%20Settings/myUsername/Application%20Data/Mozilla/Firefox/Profiles/myProfile/extensions/[e-mail]/data/UnicodeData.txt
Line: 1, Column: 5
Source Code:
0000;<control>;Cc;0;BN;;;;;N;NULL;;;;

Expected Results:  
No errors

Comment 1

[Steve England [:stevee]]

AMO reports that extension is compatible with "Firefox: 1.5 – 3.0a8" and you're on 3.0b2...

Comment 2

[Brett Zamir]

Sorry, I corrected the addon site information. It does work otherwise with 3.0b2

Comment 3

[Philip Chee]

What happens if you specify a content type?

 		request.open("GET", url);
+		request.overrideMimeType('text/plain');
 		request.send(null);

Comment 4

[Brett Zamir]

That causes the message to disappear... Though I wouldn't think I'd need that to open a .txt file opened with responseText, no?

Comment 5

[Philip Chee]

See Bug 311724 for a discussion on this issue.