Trac Attachments image break sometime

[buaa.byl@…]

Sometime trac can't display image correctly, Only ¼ or ½ image appear, and other part is blank!

I using Firefox Opera Chrome, and this issue still appear.

But after I using apache mod_rewrite, this issus gone. Below is my apache httpd.conf

WSGIScriptAlias /trac "D:/Apache/trachome/loader.wsgi.py"
<Location /trac>
    WSGIApplicationGroup %{GLOBAL}
    Order deny,allow
    Allow from all
</Location>

RewriteEngine on
#Let apache handle static file
RewriteRule  /trac/([^/]*)/chrome/common/(.*) "C:/Python25/Lib/site-packages/trac-0.12.2-py2.5.egg/trac/htdocs/$2"

#Let apache handle raw attachments
RewriteRule  /trac/([^/]*)/raw-attachment/wiki/(.*) "D:/Apache/trachome/$1/attachments/wiki/$2"

I don't know why, anyone can check this? I using windows xp sp3, apache2.2.11, python2.5.4, mod_wsgi2.0. Thanks.

[Remy Blank]

Is there anything in your Trac or Apache log that could give us a hint about the issue?

[buaa.byl@…>]

Replying to rblank:

Is there anything in your Trac or Apache log that could give us a hint about the issue?

Ok, I will enable log and check it. Thanks.

[buaa.byl@…>]

Replying to rblank:

Is there anything in your Trac or Apache log that could give us a hint about the issue?

I enable apache log and trac log. When using mod_rewrite, apache log is

127.0.0.1 - - [05/Aug/2011:16:56:11 +0800] "GET /trac/project/raw-attachment/wiki/xxx/6309fc78gw1djni1pak5sj.jpg HTTP/1.1" 200 119947

When disable mod)rewrite, apache log is

127.0.0.1 - - [05/Aug/2011:16:58:00 +0800] "GET /trac/project/raw-attachment/wiki/xxx/6309fc78gw1djni1pak5sj.jpg HTTP/1.1" 200 94208

It appear that just 94208 transfer! But actual file size is 119947 bytes(So transfer right when use mod_rewrite)!

[buaa.byl@…>]

And this patch work fine.

attachment.py

@@ -754 +754 @@
                 if 'charset=' not in mime_type:
                     charset = mimeview.get_charset(str_data, mime_type)
                     mime_type = mime_type + '; charset=' + charset
-                req.send_file(attachment.path, mime_type)
+                #req.send_file(attachment.path, mime_type)
+                filedata = fd.read()
+                req.send_header('Content-Type',  mime_type)
+                req.send_header('Content-Length', fd.tell())
+                req.end_headers()
+                req.write(filedata)
 
             # add ''Plain Text'' alternate link if needed
             if (self.render_unsafe_content and

[Christian Boos]

Looks like this is ​mod-wsgi-issue:100. Can you please try to upgrade?

[buaa.byl@…>]

Simple test to make sure if file size error.

[buaa.byl@…>]

Replying to cboos:

Looks like this is ​mod-wsgi-issue:100. Can you please try to upgrade?

Thanke, now, I upgrade to mod_wsgi-3.3, issue still.

[Christian Boos]

Please double check you really have that version number in your About page of Trac and in the Apache logs.

[buaa.byl@…>]

Replying to cboos:

Please double check you really have that version number in your About page of Trac and in the Apache logs.

I am sorry, I recompile mod_wsgi-3.3 and install again, and issue gone. Thanks for your help.

[Christian Boos]

No problem, thanks for the feedback.

I wanted to add a note in the wiki, but the problem is already well documented: TracModWSGI#Usearecentversion.

Duplicate of #7205.