January 2002
Beginner
480 pages
13h 15m
English
Content preview from Programming JabberBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Request/Response
The HyperText Transfer Protocol (HTTP) is a great example of a simple,
effective request/response model used on the Web to request and respond
to requests for HTML and other content. Example 2-4
shows a typical HTTP request/response pairing, where
GET /home.html HTTP/1.0 is the request,
and everything else, starting with HTTP/1.1 200 OK,
is the response.
Example 2-4. A typical HTTP request/response
GET /home.html HTTP/1.0 HTTP/1.1 200 OK Date: Mon, 11 Jun 2001 13:43:13 GMT Server: Apache/1.3.12 (Unix) mod_perl/1.24 Last-Modified: Fri, 09 Jun 2000 13:47:56 GMT ETag: "8a69-6a-3940f58c" Accept-Ranges: bytes Content-Length: 306 Connection: close Content-Type: text/html <html> <head> ...
It shows us the request verb GET and the specification
of what to retrieve (the /home.html document), and it
shows us what is returned in response.
While we’ve already seen that the Jabber protocol is asynchronous in
nature, there is a similar request/response model available, too, which
tends to the synchronous (i.e., first request, then response), although,
unlike HTTP, the response is not guaranteed to
immediately follow the request. Other unrelated Jabber
fragments may be received in the stream in the time between request and
response. This request/response model is called
Info/Query, or IQ for
short; the Jabber element employed in the implementation of this
model is <iq/>.
This IQ model has many uses in providing Jabber’s basic IM features. Figure 2-1 shows the element ...
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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.