You can certainly do compression by setting the response header and using the
gzip output stream, writing into a buffer. We did this and it worked well up to
a point. Some pages in combination with certain versions of the browsers
resulted in the web browser hanging or crashing, and for Netscape we had great
difficulty printing any pages that came back compressed. I don't know if there
was a solution to these problems but we dropped it. Make sure you test it
thoroughly.
The additional load on the webserver was surprisingly small, maybe 15%. There
was no noticeable difference in response of the web browser.
Bill
Heiko Grussbach <[EMAIL PROTECTED]> on 08/09/99 02:36:07 AM
Please respond to "A mailing list for discussion about Sun Microsystem's Java
Servlet API Technology." <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: Bill Kayser/Worldstreet)
Subject: Re: Compressing the output of a servlet
Hi Andr�s,
I havent used compression myself, but info may be found in J. Hunters
servlet book on page 189. According to this, you need to set the content
header of the response to x-gzip or x-compress (not just to gzip as you
do).
Also, revise your check for the the header, it might return null in which
case your first line would fail with a NullPointerException.
Please tell me if you get it working!!
Regards
Heiko
[EMAIL PROTECTED]
Andr�s Aguiar <[EMAIL PROTECTED]> on 07-08-99 11:53:47
Please respond to "A mailing list for discussion about Sun Microsystem's
Java Servlet API Technology."
<[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: Heiko Grussbach/NMG/CRP-HT)
Subject: Compressing the output of a servlet
Content-type: text/plain; charset
I'm trying to send the output of my servlet compressed to the browser,
depending on the 'Accept-Encoding' header in the HTTP request.
I've followed the HTTP1.1 spec, but it seems that I'm doing something
wrong.
This is the code I'm using:
//-----------------------------
// htmlOut is a StringBuffer that has the data to send to the browser.
if (req.getHeader("Accept-Encoding").indexOf("gzip") >{
res.setHeader("Content-Encoding", "gzip");
res.setHeader("Transfer-Encoding","chunked");
res.getOutputStream().write(new
String(Long.toHexString(htmlOut.length()).toUpperCase() +
"\r\n").getBytes());
GZIPOutputStream gzOut GZIPOutputStream(res.getOutputStream());
gzOut.write(htmlOut.toString().getBytes());
gzOut.close();
res.getOutputStream().write(new
String("\r\n0\r\n\r\n").getBytes());
res.getOutputStream().close();
}
//---------------------
If someone was able to do it, send me a clue.
Regards.
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