January 2002
Beginner
480 pages
13h 15m
English
Content preview from Programming Jabber
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Synopsis
<message to='piers@pipetree.com/Home' from='qmacro@jaber.org' type='error'>
<body>Are you there?</body>
<error code='502'>Unable to resolve hostname.</error>
</message>
The <error> subelement is for
carrying error information in a problem situation. In this example,
the original message sent by piers@pipetree.com
was a simple “Are you there?” to what he thought was
qmacro’s JID on the Jabber server at
jabber.org.
However, the to attribute was specified
incorrectly (jaber.org), and the Jabber server on
pipetree.com wasn’t able to resolve the hostname. So
Piers receives his message back with
an additional <error/>
subelement, and the message type has been switched to error
(the type='error' attribute).
The <error/> subelement
carries two pieces of related information: an error number, specified
in the code attribute, and the error
text. Table 5-3 lists standard error codes and texts. The
entity generating the error can specify a custom error text to go with
the error code; if none is specified, the standard text as shown is used.
Table 5-3. Standard error codes and texts
|
Code |
Text |
|
400 |
Bad Request |
|
401 |
Unauthorized |
|
402 |
Payment Required |
|
403 |
Forbidden |
|
404 |
Not Found |
|
405 |
Not Allowed |
|
406 |
Not Acceptable |
|
407 |
Registration Required |
|
408 |
Request Timeout |
|
409 |
Conflict |
|
500 |
Internal Server Error |
|
501 |
Not Implemented |
|
502 |
Remove Server Error |
|
503 |
Service Unavailable |
|
504 |
Remove Server Timeout |
|
510 |
Disconnected |
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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.