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From: bugzilla@apache.org
To: dev@tomcat.apache.org
Subject: [Bug 55842] New: response.setBufferSize() does not seem to work
 properly
Date: Wed, 04 Dec 2013 15:56:09 +0000
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X-Bugzilla-Product: Tomcat 7
X-Bugzilla-Component: Catalina
X-Bugzilla-Version: 7.0.47
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X-Bugzilla-Who: martin.maier-moessner@oenb.at
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https://issues.apache.org/bugzilla/show_bug.cgi?id=55842

            Bug ID: 55842
           Summary: response.setBufferSize() does not seem to work
                    properly
           Product: Tomcat 7
           Version: 7.0.47
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: martin.maier-moessner@oenb.at

I found a problem with setting the buffer size for the ServletResponse. 
If I call 'response.setBufferSize(1,000,000);' and send about 20,000
characters, the response will be chunked even though it should not.
The response is sent in several chunks and contains the 'Transfer-Encoding:
chunked' response header.
In my understanding in this case the response should be fully buffered on the
server and then sent as a whole containing the Content-Length-header.

This causes a problem in my application because I want to use a larger buffer
to be able to redirect to an error page if an error occurs during rendering the
response. 

I was able to reproduce this on Tomcat 7.0.39, 7.0.40, 7.0.42, 7.0.47. Tomcat
7.0.37 works fine and as expected.

This is easily reproducable by using a JSP as follows:
<%
response.setBufferSize(1000*1000);
for (int i = 0; i < 100; i++) {
    for (int j = 0; j < 100; j++) {
        response.getWriter().write("X");
    }
    response.getWriter().write("<br />");
}
%>

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