May 2001
Intermediate to advanced
304 pages
6h 12m
English
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Chapter 7. Network Protocols
“Increasingly, people seem to misinterpret complexity as sophistication, which is baffling—the incomprehensible should cause suspicion rather than admiration. Possibly this trend results from a mistaken belief that using a somewhat mysterious device confers an aura of power on the user.”
—Niklaus Wirth
Overview
This chapter describes Python’s socket protocol support and the
networking modules built on top of the socket module. These include
client handlers for most popular Internet protocols, as well as
several frameworks that can be used to implement Internet servers.
For the low-level examples in this chapter, I’ll use two protocols for illustration: the Internet Time Protocol and the Hypertext Transfer Protocol.
Internet Time Protocol
The Internet Time Protocol (RFC 868, Postel and Harrenstien, 1983) is a simple protocol that allows a network client to get the current time from a server.
Since this protocol is relatively lightweight, many (but far from all) Unix systems provide this service. It’s also about as easy to implement as a network protocol can possibly be. The server simply waits for a connection request and immediately returns the current time as a 4-byte integer containing the number of seconds since January 1, 1900.
In fact, the protocol is so simple that I can include the entire specification:
File: rfc868.txt Network Working Group J. Postel - ISI Request for Comments: 868 K. Harrenstien - SRI May 1983 Time Protocol This RFC specifies a ...
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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.
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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.