how to gzip-compress large Ajax responses (HTML only) in Coldfusion?
- by frequent
I'm running Coldfusion8 and jquery/jquery-mobile on the front-end.
I'm playing around with an Ajax powered search engine trying to find the best tradeoff between data-volume and client-side processing time.
Currently my AJAX search returns 40k of (JQM-enhanced markup), which avoids any client-side enhancement. This way I'm getting by without the page stalling for about 2-3 seconds, while JQM enhances all elements in the search results.
What I'm curious is whether I can gzip Ajax responses sent from Coldfusion. If I check the header of my search right now, I'm having this:
RESPONSE-header
Connection Keep-Alive
Content-Type text/html; charset=UTF-8
Date Sat, 01 Sep 2012 08:47:07 GMT
Keep-Alive timeout=5, max=95
Server Apache/2.2.21 (Win32) mod_ssl/2.2.21 ...
Transfer-Encoding chunked
REQUEST-header
Accept */*
Accept-Encoding gzip, deflate
Accept-Language de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Connection keep-alive
Cookie CFID= ; CFTOKEN= ; resolution=1143
Host www.host.com
Referer http://www.host.com/dev/users/index.cfm
So, my request would accept gzip, deflate, but I'm getting back chunked.
I'm generating the AJAX response in a cfsavecontent (called compressedHTML) and run this to eliminate whitespace
<cfrscipt>
compressedHTML = reReplace(renderedResults, "\>\s+\<", "> <", "ALL");
compressedHTML = reReplace(compressedHTML, "\s{2,}", chr(13), "ALL");
compressedHTML = reReplace(compressedHTML, "\s{2,}", chr(09), "ALL");
</cfscript>
before sending the compressedHTML in a response object like this:
{"SUCCESS":true,"DATA": compressedHTML }
Question
If I know I'm sending back HTML in my data object via Ajax, is there a way to gzip the response server-side before returning it vs sending chunked? If this is at all possible? If so, can I do this inside my response object or would I have to send back "pure" HTML?
Thanks!
EDIT:
Found this on setting a 'web.config' for dynamic compression - doesn't seem to work
EDIT2:
Found thi snippet and am playing with it, although I'm not sure this will work.
<cfscript>
compressedHTML = reReplace(renderedResults, "\>\s+\<", "> <", "ALL");
compressedHTML = reReplace(compressedHTML, "\s{2,}", chr(13), "ALL");
compressedHTML = reReplace(compressedHTML, "\s{2,}", chr(09), "ALL");
if ( cgi.HTTP_ACCEPT_ENCODING contains "gzip" AND not showRaw ){
cfheader name="Content-Encoding" value="gzip";
bos = createObject("java","java.io.ByteArrayOutputStream").init();
gzipStream = createObject("java","java.util.zip.GZIPOutputStream");
gzipStream.init(bos);
gzipStream.write(compressedHTML.getBytes("utf-8"));
gzipStream.close();
bos.flush();
bos.close();
encoder = createObject("java","sun.misc.
outStr= encoder.encode(bos.toByteArray());
compressedHTML = toString(bos.toByteArray());
}
</cfscript>
Probably need to try this on the response object and not the compressedTHML variable
