GZip a string for output from Coldfusion results in "Content Encoding Error" in browsers
I am trying to GZip content in a variable to output to the browser. To start I am making this very simple and not worrying about browsers that do not support gzip. Also I have put this together from researching several methods that I could find on the web. Some of them from people that may be reading this question.
<cfsavecontent variable="toGZIP"><html><head><title>Test</title></head><body><h1>Fear my test</h1></body></html></cfsavecontent>
<cfscript>
ioOutput = CreateObject("java","java.io.ByteArrayOutputStream");
gzOutput = CreateObject("java","java.util.zip.GZIPOutputStream");
ioOutput.init();
gzOutput.init(ioOutput);
gzOutput.write(toGZIP.getBytes("UTF-8"), 0, Len(toGZIP.getBytes()));
gzOutput.finish();
gzOutput.close();
ioOutput.flush();
ioOutput.close();
toOutput=ioOutput.toString("UTF-8");
</cfscript>
<cfcontent reset="yes" /><cfheader name="Content-Encoding" value="gzip"><cfheader name="Content-Length" value="#ArrayLen( toOuptut.getBytes() )#" ><cfoutput>#toOuptut#</cfoutput><cfabort />
But I get an error in Firefox (and chrome and Safari)
Content Encoding Error
The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.
Anybody have any ideas?
OS: Mac OX-X Snow Leopard
CF: 9-Dev Webserver: ApacheSOLUTION
<cfsavecontent variable="toGZIP"><html><head><title>Test</title></head><body><h1>Fear my test</h1></body></html></cfsavecontent>
<cfscript>
ioOutput = CreateObject("java","java.i开发者_运维知识库o.ByteArrayOutputStream");
gzOutput = CreateObject("java","java.util.zip.GZIPOutputStream");
ioOutput.init();
gzOutput.init(ioOutput);
gzOutput.write(toGZIP.getBytes(), 0, Len(toGZIP.getBytes()));
gzOutput.finish();
gzOutput.close();
ioOutput.flush();
ioOutput.close();
toOutput=ioOutput.toByteArray();
</cfscript>
<cfheader name="Content-Encoding" value="gzip"><cfheader name="Content-Length" value="#ArrayLen(toOutput)#" ><cfcontent reset="yes" variable="#toOutput#" /><cfabort />
The follow line look completely wrong:
toOutput=ioOutput.toString("UTF-8");
You encode the GZip stream with UTF8. The result are garbage data. The best you set the GZip data as binary if ColdFusion has the option. If you can only set a string then you need an encoding that not change any bytes. For example iso1.
Is there a reason you're doing it manually over letting the web server (IIS or Apache) handle this? Both of them support GZip encoding, and will probably do so faster and better than your manual process.
- Enabling GZip in IIS6
- Enabling GZip in IIS7
- Enabling GZip in Apache2
Please note that you have syntax error in the code: toOuptut instead of toOutput.
Unfortunately, I'm not a Java expert and can't say what exactly is wrong. But when I try to save the contents into the file using wget, it contains not zipped binary, but source HTML. It can mean that gzOutput-related processing does not produce correct output.
BTW, verifying the browser support of GZip is pretty simple. You can check the Accept-Encoding header, like this:
<cfif FindNoCase("gzip", cgi.HTTP_ACCEPT_ENCODING)>
<!--- prepare the gzipped text --->
</cfif>
加载中,请稍侯......
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