March 2006
Beginner to intermediate
448 pages
13h 33m
English
Content preview from Head Rush Ajax
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134
Request
object
Request URL
Your JavaScript request
object sends a request
to the web server.
The request URL goes to the
server, and tells the server
what script or servlet or
program to run.
The server gets ready to
pass on the request and any
request data to a program.
1
Your request object sends a
request to a web server.
ready states and status codes
Request
object
PHP script
?
Unknown resource
Request URL
2
The web server tries to locate
the program in the request URL.
The server is sending a lot of information back in its response...
maybe more than you realized. Here’s a look at how the server
returns both a ready state and a status code:
Servers return a ready state and a status code
The server gures out what
program is requested by
looking at the request URL.
Most of the time, the
program in the request URL
is a script or program running
on the server.
Sometimes, the server
has a problem nding a
program, or getting access
to a particular resource.
135
duplication prohibited
status = 200
If the server can’t nd the
program specied by the URL, the
status code it returns is “404”.
3
The server gures out what
status code it should return.
Request
object
PHP script
?
Unknown resource
Request URL
If a program handles the request,
and there are no problems, a
status of “200” is returned.
Request
object ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.