We have found that Apache v2.2.4 is unable to serve image files under HP-UX 
B.11.31

uname -a
HP-UX heracles B.11.31 U 9000/800 973227353 unlimited-user license

We used a fairly default configuration and build procedure:

./configure --prefix=/scratch3/cm/heracles/apache224 --with-included-apr
make
make install

Using the generated configuration (with no changes to httpd.conf from us) we 
find that text files can be served.  For example:

http://heracles/index.html

But, image files are not served- e.g.:

http://heracles/apache_pb.gif

However, Apache does correctly acknowledge the request for the image in the 
access log:

172.16.61.3 - - [22/Aug/2007:17:04:01 -0400] "GET /apache_pb.gif HTTP/1.1" 200 
2326

I have tried 'getting' the image using a program and what seems to happen is 
that the connection is broken before the first Byte of the response is 
recieved.

I have written a CGI program (in C) to programatically generate and return 
image files and that works well so there appears to be a problem with the way 
Apache is handling static binary files on this platform.