Okay, I have played around with this a little. Here are some notes and
questions.
This doesn't work on static files, which might be a good thing.
Static files are handled via fastpath.c, and it is very efficient. It returns
a not modified response, or zero content, just headers if the file hasn't
changed. When you combine this with the browser cache, even a refresh is
efficient. So, with AOLserver, try to use static files if possible, even as a
cache, which we have talked about before.
Dynamic files are covered, Filters can be used to enable the flag for a given
conn, the filter pattern limits the scope. Local tcl files can disable
compression.
So the question is how to handle static files. One idea is to check if
compression is enabled, if so, check if a compressed file exists
(file.ext.gz), use the uncompressed file to figure out the content type, and
return the compressed file (assuming the client sends the correct headers).
Ideas?
tom jackson
On Monday 14 April 2008 13:39, Tom Jackson wrote:
> Brett,
>
> I think I got the gzip thing working, at least the flag part.
>
> It turns out that all the plumbing is already in AOLserver. The only thing
> missing was the ability to call Ns_ConnSetGzipFlag as a tcl command.
>
> The gzip/compress core code is in 'compress.c', but the gzip functions are
> in the zlib module. Since the zlib module has a tcl command, I added a
> subcommand to this to handle the switch.
>
> There is a little more to it, but basically here is the addition:
>
> case ZSetFlagIdx:
> if (Tcl_GetBooleanFromObj(interp, objv[2], &compress) != 0) {
> return TCL_ERROR;
> }
> Ns_Log(Notice, "Setting Gzip Flag to %i", compress);
> Ns_ConnSetGzipFlag( Ns_GetConn(), compress );
> break;
> }
>
> The modified code is here:
>
> http://rmadilo.com/files/nszlib/
>
>
> There are some notes on this for the existing adp compression:
>
> ns_section ns/server/server1
> ns_param gzip true; # Enable compression.
> ns_param gziplevel 4; # Compression level.
> ns_param gzipmin 4096; # Minimum size before gzip.
>
> You use the API Like this:
>
> ns_zlib setflag 1 ;#(or 0) (any boolean value actually)
>
>
> tom jackson
>
>
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