Hi there,
I'm getting some pretty unfortunate behaviour from JRun 3.0.
I've written my own basic FileServlet for serving files direct from the file
system. It makes the call:
lIfModifiedSince = aRequest.getDateHeader( "If-Modified-Since" );
to get the value of the If-Modified-Since header to tell if you can tell the
client that the page hasn't changed. Now, if you call it (for the second
time, when it's trying to cache) from Netscape 4.x or IE5.0, this code
generates a NullPointerException, eg
java.lang.NullPointerException
at
allaire.jrun.ServletConnection.getDateHeader(ServletConnection.java:281)
at mypackage.FileServlet.doGet(FileServlet.java:80)
I put some debugging code in to print out the value of the Header extracted
as a string using Request.getHeader( "If-Modified-Since") and I get:
'Thu, 27 Jul 2000 10:08:15 GMT; length=125'
Seems the length= value is a non-standard extra that not in the HTTP spec
but both IE and NS add it in...
Even worse, this behaviour will also presumably break _any_ servlet that
overrides getLastModified(), because java.servlet.HttpServlet.service() also
calls getDateHeader("If-Last-Modified") if your implementation of
getLastModified doesn't return -1. My FileServlet does it all itself, so I
didn't see this problem immediately
Now, the funny thing is that I don't get any exceptions or problems when I
run this under Tomcat. It appears it's code ignores the end of line. So
presumably they've already dealt with this problem...
I could code around it manually, but then I need to try and deciper the at
least three different date formats that the HTTP spec specifies, and given
this only occurs under JRun, i'd rather not...
Note, I managed to find some discussion about this on the official HTTP
mailing list archive, and it seems they think one ought to ignore trailing
stuff in this case ... see
http://www.ics.uci.edu/pub/ietf/http/hypermail/1996q2/0817.html
cheers
Geoff
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