Head Rush Ajax

you’re on your way 4

115

ajax requests

Internet Explorer is a pretty smart browser,

and tries to do lots of things to help make your

browsing a better and faster experience. For

instance, it will cache a lot of your images, so if

you visit a page with lots of graphics, and then

come back later, you’ll see the graphics come up

really quickly.

IE tries to do something similar with URLs. If

you make a request to a server-side program, IE

keeps track of the URL you requested. Then, if

you make a request to the same URL—without

any different data—IE gures you’re going to

get the same response. So, instead of re-sending

the request, it just gives you the result from the

rst time you made the request.

Since we rst saw this problem in the Boards

‘R’ Us app, let’s start by xing that app on

Windows. Then, we can take what we learned

and x up Break Neck Pizza, too.

What’s going on in Windows?

And what about that Windows problem from

back in Chapter 1? Don’t we need to x that

so Break Neck runs on Macs and PCs?

brain

power

Why would Internet Explorer’s and Opera’s caching of requests cause a

problem in the Boards ‘R’ Us application? Will this also create trouble for

customers using the Break Neck pizza order form? And what should we

do to try and x this problem?

The Opera browser does

the same thing that IE

does in this situation: it

caches URLs.