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14: Con guring Linux Network Services
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document root or root directory The Apache Web server s document root is the /srv/ www/htdocs directory Communications between the Web browser and the Web server are accomplished using the IP protocol in conjunction with the Hypertext Transfer Protocol (HTTP) HTTP is a request/response protocol used by the Web browser to get information from the Web server The browser initiates the request by establishing a TCP/IP communication session between the client system and the Web server, which runs on IP port 80 by default The Web server then listens for the browser to tell it what information it wants The browser does this by sending a GET message to the Web server, which responds with the requested files When using a Web browser, you use a Uniform Resource Locator (URL) to access information on the Web server A URL is used by your browser to specify the exact information you need from the Web server as well as how it is to be retrieved The syntax for a URL is as shown here:
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protocol://domain_name or IP_address:port/filename
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The protocol portion of the URL specifies the protocol the browser will use to retrieve information If you re accessing a Web server, you will be using the HTTP or HTTPS protocol, so the first part of the URL will be http or https The HTTP protocol is used to transfer information from the Web server using unencrypted transmissions This level of security is acceptable for many Web pages However, if you are transferring sensitive information, this could present a problem Someone using sniffing software could potentially capture the information being transferred between your browser and the Web server For sensitive information, such as credit card numbers or personal information, we use the HTTPS protocol The HTTPS protocol uses standard HTTP, but it also uses the Secure Sockets Layer (SSL) protocol to encrypt the data before sending it Only the sender and receiver have the keys that can decrypt the information Sniffers on the Internet can still capture the information being transferred, but they won t be able to decode the data because they don t have the key needed to decipher it After specifying the protocol, you next add a :// to the URL After these characters, you specify the domain name or IP address of the Web server you want to access After the domain name or IP address, you add a : to the end of the URL Then you (optionally) specify the IP port where the Web server is running For example:
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This tells the browser to access port 80 on wwwnebo-techcom However, we don t usually specify a port at the end of URLs when browsing the Web That s because Web browsers default to port 80 if you don t specify a port number in the URL
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Con gure the Apache Web Server on Linux
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(HTTPS requests default to port 443) Because most Web servers are configured to use port 80, this convention works most of the time If, for some reason, the Web server you re accessing has been configured to use a different port number, however, you will need to explicitly include it in the URL After the port number, you add a / to the end of the URL Then you specify the file name that you wish to retrieve from the Web server, for example:
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As with ports, you also don t have to always explicitly include the name of the file you want to retrieve from the Web server That s because Web servers are usually configured such that, if no file name is specified in the URL, it sends a file named indexhtml by default If the file you re requesting has a name other than indexhtml, then you will need to explicitly specify it in the URL With this background in mind, let s next discuss how you go about installing the Apache Web server daemon on your system
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