Re: JavaScript Compression

[Simon Coulter <shc@xxxxxxxxxxxxxxxxx>]

On 13/03/2008, at 5:09 AM, Crispin Bates wrote:

> HTTP 1.1 needs to be used.

True. I should have mentioned that.

> IIRC, not all browsers have it set to be used
> (I.E 7.0 didn't when it originally shipped). For I.E. 7.0
> Tools/Options/Advanced/HTTP 1.1 Settings/Use HTTP 1.1.

I have not installed IE 7 on anything yet but I find that strange for  
IE 7 given that IE 5, 5.5, and 6 had "Use HTTP 1.1" active as  
shipped. What none of them had active is "Use HTTP 1.1 through proxy"  
which can cause no end of grief.

Many proxies only (or are configured to only) do HTTP/1.0 **AND**  
they think they know more about the communication protocol than they  
do. Many of them also ignore or change headers which can also cause  
grief.

Most (at least all I've seen) modern browsers do HTTP/1.1 as standard  
and most give some way to disable it although that's not usually  
necessary any more and I'm not sure why anyone would want to unless  
communicating with a really old (and badly coded) server.

> I'm pretty sure that if HTTP 1.1 is not used then the DEFLATE is  
> ignored (at
> least that's what I remember from when we set up the compression)...

It's not "ignored" per se. Rather the HTTP headers that control  
compression do not exist prior to HTTP/1.1 so they are not sent so  
compression doesn't occur.

> Just incase your browser is not set up for HTTP 1.1, this may be  
> why you see
> no difference. We noticed much improved responses once it was  
> active (but
> that was several years ago now)...

Regards,
Simon Coulter.
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