IIS, Apache, and header()

I'm working on migrating a website from an external server (running Apache) to a local server (running IIS), and have come across an issue that I can't seem to resolve.

The site is using a custom Joomla plugin that grabs some graphics stored in a mysql database (for e.g. http://www.norfolktourism.ca/index.php?option=com_bdirectory&task=image&cid=191). However, when I migrate the site to the local server, the images are broken.

Upon further exploration, I've discovered that somehow, when ra开发者_JAVA技巧n on the local server, their seems to be whitespace (as in a new line) that gets processed before the header() function is processed, hence breaking the image (however, I don't get an error - just a broken image).

I'm absolutely baffled as to what the issue may be, as the code works fine on the external Apache server.

Would anyone have any suggestions on possible resolutions?

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Difficult to say, and the scenario is not clear. The external Apache server runs on Linux or Windows ? May be some bug related with newlines?

Update: For example, for debugging, you could run this and compare with the output (for the same image) in your IIS server:

[root@server1 tmp]# wget -S -O imgunix.jpg 'http://www.norfolktourism.ca/index.php?option=com_bdirectory&task=image&cid=191'
HTTP request sent, awaiting response...
  HTTP/1.1 200 OK
  Date: Wed, 09 Jun 2010 15:18:21 GMT
  Server: Apache
  Content-Length: 4406
  Content-Disposition: filename="health.jpg"
  Content-Type: image/jpeg
Length: 4406 (4.3K) [image/jpeg]

[root@server1 tmp]# od -c imgunix.jpg | head                                                   0000000 377 330 377 340  \0 020   J   F   I   F  \0 001 002  \0  \0   d
0000020  \0   d  \0  \0 377 354  \0 021   D   u   c   k   y  \0 001  \0
0000040 004  \0  \0  \0   <  \0  \0 377 356  \0 016   A   d   o   b   e
0000060  \0   d 300  \0  \0  \0 001 377 333  \0 204  \0 006 004 004 004