Attached is a three line diff for
round-0.6.3/roundup/cgi/client.py. Since the content
length is easily available, we should send it. I can't
find it now, but I remember reading somewhere when I
was doing a Java servlet that setting Content-Length
allowed browsers to do things faster.

References:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13

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For Java, setting Content-Length allows the server to use a
persistent connection. I don't know if anything similar
applies to the Python server.

http://java.sun.com/products/servlet/2.2/javadoc/javax/servlet/http/HttpServlet.html#doGet(javax.servlet.http.HttpServletRequest,%20javax.servlet.http.HttpServletResponse)

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I tried to do some testing. I didn't really see any
significant difference between setting the Content-Length
and not setting the Content-Length.

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Hurm. This patch assumes a single write() call with the entire response,  
which isn't always the case. I've added the content-length header to the  
file serving, as we do know the length beforehand there.