img tag welcome-file WARNING

[Leif Magden]

Developer warning:
 If your HTML pages have img tags with empty src attributes, i.e.
   <img height="1" width="175" alt="" src="" />  (these are used to 
format and justify text on the page)

 They will cause Tomcat to call your applications welcome-file.  
Apparently Tomcat handles this the same way as
a directory navigation, that is, it is handed to the DefaultServlet.  
This is invisible to the client but the server is
loaded with all the overhead of resolving the welcome-file over and 
over.  In my application this results in approximately
double the server/database load for each page navigation.
 The fix is to specify a clear or transparent image in the src 
attribute i.e. src="images/clear.gif"

 Config:
            Tomcat version 4.1.24
             org.apache.catalina.servlets.DefaultServlet  (possibly)
              Windows 2000 or Solaris
               J2SDK1.4.2
Leif Magden

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