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RewriteCond %{HTTP_USER_AGENT} RewriteRule ^foohtml$ RewriteCond %{HTTP_USER_AGENT} RewriteCond %{HTTP_USER_AGENT} RewriteRule ^foohtml$ foo32html [L] ^Mozilla/3* fooNShtml ^Lynx/* ^Mozilla/[12]* foo20html [L] RewriteRule ^foo_html$ [L] [OR]
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4 Save the changes to httpdconf 5 Restart httpd
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1 How can a mod_rewrite be used to change a URL only if a certain condition is met 2 Before any rewriting rules will function properly, what directive must be present in httpdconf
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Answers
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1 The RewriteCond directive must be specified, along with a matching statement, in order to provide a matching condition 2 RewriteEngine On must be present before mod_rewrite will work
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Lab VIII
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2 Is it possible to redirect a user through a proxy server 3 How can a testpattern be compared to a condpattern lexically in a RewriteCond directive
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Create a Custom Log for Apache
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Purpose
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The purpose of this lab is to create and implement a custom log file that tracks remote IP-addresses, lists the REFERRER environmental variable, the time the request occurred (common log format), and the time it takes to serve the request Optionally, you can run logresolve to resolve the IP addresses, as well as view the log file using a popular log-viewing program
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Theory
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By default, Apache comes with basic logging capabilities However, the logging capabilities of Apache can be greatly expanded by using the mod_log_config module This module allows the administrator to set custom log definitions through the httpdconf file mod_log_config contains several different directives used to configure the log file, but the main directive of interest is LogFormat, which is used to specify what data is to be placed in the log and in what format Other mod_log_config directives are listed in Table IX1
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Lab IX Table IX1 mod_log_config Directives DESCRI PTION Sets the file name for logging cookies Sets the file name of the custom log Similar to custom log, with some restrictions
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DI RECTIVE CookieLog CustomLog TransferLog
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The basic syntax for the LogFormat directive is as follows:
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LogFormat formatoptions name
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where formatoptions specifies the format to write and name is an identifier used by CustomLog Directives The most useful characteristic of mod_log_config is its ability to configure the data contained in a log file This is done by providing a list of options to the LogFormat directive A list of some of the options is provided in Table IX2
Table IX2 OPTION %a %A %B %D %h %H %P %r %t %u %U
Options for mod_log_config DESCRI PTION Remote IP address Local IP address Bytes sent, not including headers Time taken in microseconds Remote host Request protocol PID of serving process First line of request Time in CLF Remote user URL path requested
Create a Custom Log for Apache
The codes shown in Table IX2 can be included on a conditional basis by placing an HTTP code between the percent sign (%) and the letter For example, %404U will put the requested URL in the log file if an HTTP 404 error is encountered By putting an exclamation point (!) before the HTTP code, the negative condition will cause logging Text may also be put in a log file entry by placing it within braces ({}) and inserting it between the percent sign and the letter Once a format has been specified in httpdconf, it must be implemented via either CustomLog or TransferLog directives CustomLog is more commonly used because it is more versatile The typical format for a CustomLog directive is this:
CustomLog file name
file specifies the file to which to log, and name is the name used in the LogFormat directive
Lab Exercises
N OT E
installed This lab assumes that the user has Apache with mod_log_config
1 Open httpdconf in a text editor 2 In the main section of the file, add a LogFormat directive that lists remote IP addresses, lists the REFERRER environmental variable, the time the request occurred (common log format), and the time it takes to serve the request 3 Create a name to reference this configuration 4 Add a CustomLog line that logs data to /var/log/access_ logtest using the format created in Step 2 5 Restart Apache 6 Make a request to the Web server from another machine 7 Open /var/log/access_logtest in a text editor to test the configuration