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Understanding how networks function is important for optimizing your Apache server The next chapter will discuss Apache s relationship with network protocols
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CHAPTER
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Define Apache s network protocols List and define Apache s Internet-related features List the Apache Web site hosting methods Define virtual hosting Define the mod_rewrite module List the mod_rewrite associated variables
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In this section of the networking chapter, Apache s use of TCP/IP, HTTP, and other protocols will be discussed These are important for any Apache administrator to understand because of the inherent purpose of Apache: to serve data over a network
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In a Transmission Control Protocol/Internet Protocol (TCP/IP) network, every computer gets a unique IP address TCP/IP is the main protocol suite that allows all the computers on the Internet to communicate Rather than remembering the number of every computer you want to connect to on the Internet, an easy-to-remember name is used to connect to Web sites This name-to-number translation is possible with the Domain Name System (DNS), a group of distributed servers that exist to translate the string of numbers (such as IP address 642084241) into names (such as wwwapacheorg) Every time the name of a Web site is entered, the name must be resolved to an IP address through a look-up on a DNS server to determine where to send the request Apache relies on TCP/IP for many things, not the least of which is to communicate with Internet browsers Web browsers and servers use a different language that primarily depends on TCP/IP as a transport Although other transport protocols can be used, TCP/IP port 80 is typically used for Internet Web servers to carry the request/response protocol known as HTTP
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Hyper Text Transfer Protocol (HTTP) is the protocol that browsers and servers use to submit and serve requests Uniform Resource Identifier (URI), Uniform Resource Location (URL), and Uniform Resource Name (URN) are all part of the communication between clients and servers using HTTP to communicate Each request/response is preceded by a bit of information about the request/response that is contained in a header
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The client and the server know they are actually dealing with hypertext when they transfer information back and forth because, when they send data, they start their transmissions with headers A header is a piece of information that tells the client or the server what kind of information it is receiving Thanks to headers, the Web browser usually knows the difference between text files, HTML files, JPEG images, and so forth
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Apache makes significant use of headers for everything from file translation to Web browser redirection Because headers indicate what kind of Web browser is hitting the Web site, Apache can do specific things based on the browser information contained in the header Headers will be discussed in greater detail later in this book
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Hyper Text Transfer Protocol (HTTP) is an acronym that makes more sense when broken down into its components Hypertext is the format of the content viewed in a Web browser The following is an example of a hypertext document
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 401 Transitional//EN" "http://wwww3org/TR/1999/REC-html401-19991224/loosedtd"> <html lang="en"> <head> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> <title>Untitled</title> </head> <body bgcolor="#FFFFFF"> <h2 align="center"> Welcome to hypertext Enjoy your stay </h2> </body> </html>
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The transfer protocol is the means by which Web servers and clients share hypertext There is currently a revolution developing in HTTP HTTP/11 is the version that is slowly taking over the Web; it will be discussed in further detail in the next section When a Web browser (a client) is directed at a Web site (a server), it makes a request for information The server receives that request and through a series of phases decides what to do with it If the server feels inclined, it will send a response back to the client, which the client then renders as content
HTTP/11
HTTP/11 has many features above the 10 standard Web browsers are beginning to support the new protocol Apache is in full compliance with