By John Goerzen, Brandon Rhodes
You'll examine basics like IP, TCP, DNS and SSL by utilizing operating Python courses; additionally, you will be ready to get yourself up to speed with infrastructure elements like memcached and message queues. it's also possible to delve into community server designs, and evaluate threaded ways with asynchronous event-based suggestions. however the largest switch is that this edition's accelerated therapy of the net. The HTTP protocol is roofed in vast element, with every one characteristic followed by way of pattern Python code. you should use your HTTP protocol services by means of learning a whole bankruptcy on reveal scraping and you'll then try out lxml and BeautifulSoup opposed to a real-world site.
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Additional info for Foundations of Python Network Programming, 2nd Edition: The comprehensive guide to building network applications with Python
It is known as the need for multiplexing: the need for a single channel to be shared unambiguously by several different conversations. It was famously discovered that radio signals can be separated from one another by using different frequencies. To distinguish among the different destinations to which a UDP packet might be addressed—where all we have to work with are alphabets of symbols—the designers of IP chose the rough-and-ready technique of labeling each UDP packet with an unsigned 16-bit number (which therefore has a range of 0 to 65,536) that identifies a port to which an application can be attached and listening.
Info CHAPTER 1 ■ INTRODUCTION TO CLIENT/SERVER NETWORKING card is to send and receive such packets without making the computer’s operating system care about the details of how the network operates down at the level of wires and voltages. What, then, is the Internet Protocol? The Internet Protocol is a scheme for imposing a uniform system of addresses on all of the Internetconnected computers in the entire world, and to make it possible for packets to travel from one end of the Internet to the other.
Second, the complicated details of how hostnames are resolved to IP addresses are usually handled by the operating system. Like most details of the operation of the Internet Protocol, your operating system prefers to take care of them itself, hiding the details both from you and your Python code. Actually, the addressing situation can be a bit more complex these days than the simple scheme just described. Because the world is beginning to run out of 4-byte IP addresses, an extended address scheme, called IPv6, is being deployed that allows absolutely gargantuan 16-byte addresses that should serve humanity’s needs for a very long time to come.