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Using mod_rewrite to simplify the URL rewriting in Apache - A basic guide for the module mod_rewrite
Introduction
URL rewriting is the process of handling a URL or a link that is sent to a web server, so that the link is changed dynamically on the server to include additional parameters and information along with a redirect server started. The Web server performs all these manipulations on the fly so that the browser is kept off the track in relation to the modification in the URL and redirection.
URL Re-can benefit your websites and web based applications, providing greater safety, better visibility and respect with the search engines and helps maintain the structure of the website more easy to maintain for future changes.
You can read about the theory and benefits of URL rewriting my previous article, which can be accessed from title = "Read the article explains the basics of rewriting URL "> here. In this article we will look at how we can use URL rewriting in an environment of Apache server Web using the Apache mod_rewrite module.
Mod_rewrite What?
Mod_rewrite module is one of the most favored for the web server Apache and many Web developers and administrators who will vote this module as the best that can happen in Apache. This module has a lot of tricks up his sleeve that can be called the Swiss Army knife of all Apache modules. In addition to providing a simple URL rewrite functionality for Apache-based Web site, this form on the website of the arms with a better protection of URLs, better visibility in search engines, protection against bandwidth thieves to stop hot-linking, the possibilities of restructuring without any problems and provide options for friendly URLs for web users. This module, due to its versatility and functionality can sometimes feel a bit tricky to master, but to get a through understanding of the basics you can do a master in the art of URL rewriting.
Let's start! - To see all the things you need to have your test environment for mod-rewrite alive and kicking.
First you must have properly configured an Apache Web server on your test machine. Mod_rewrite is usually installed along with the Apache server, but if that is not - this may be the case on a Linux machine in the mod_rewrite module was not compiled with the installation - you have to get it installed. To use the Apache mod_rewrite on your machine, will have to configure this module for dynamic loading of the application made by Apache. In a shared server you will need to contact your web hosting company get this module installed and loaded into Apache.
In your local machine to which you can find out if the module is installed with Apache, glancing at The Apache module directory. Check for a file called mod_rewrite.so and if it is there the module can be done to be loaded into the Apache server dynamically. By default this module does not load when you start Apache and have to tell Apache to enable dynamic load this module to make changes in the configuration file web server, which is explained below.
How to Enable mod_rewrite in Apache?
You can have the mod_rewrite module loaded dynamically Apache web server in the environment of LoadModule directive in httpd.conf. Load this file in a text editor and find a similar line to that below.
# LoadModule rewrite_module modules / mod_rewrite.so
Uncomment this line removing the # and save the file httpd.conf. Restart the Apache server and if all went well mod_rewrite module will now be enabled on your web server.
Allows Return to write our first URL using mod_rewrite
Ok, now the mod_rewrite module is enabled on your server. Let's take a look at how to make this module Load yourself and make it work for us.
To load the module dynamically you have to add one line to your. Htaccess. Him htaccess configuration files are Apache directives defined therein and provide distributed directory-level configuration for a web site. Create a file. Htaccess on your web server directory test - or any other directory where you want URL rewriting to make active - and add the line below is given.
RewriteEngine on
Now we have the rewrite engine on and Apache is ready to rewrite URLs for you. Here is a sample of rewriting instructions to make a request to our server to redirect second.html first.html server level. Add the line given below to your. htaccess with the directive RewriteEngine that we added earlier.
RewriteRule ^ $ first.html second.html
I'll explain what we have done here in the next section, but if all goes well, then all applications on your server first.html was transferred to second.html. This is one of the simplest ways URL Rewritting.
One point to note here is that the redirect was kept completely hidden from the client and this is not the classic HTTP redirects. The client or the browser is given the impression that the contents of the download from first.html second.html. This allows websites to generate the URL to fly with the consciousness of clients and is what URL Rewriting makes it very powerful.
Fundamentals of mod_rewrite
We now know that mod_rewrite be enabled for an entire website or a specific directory using. Htaccess rewrite and have a basic directive in the example above. Here I will explain exactly what we have done in the first sample rewrite.
mod_rewrite module provides a set of configuration directive statements and URL rewriting RewriteRule directive - which we saw in example above - is the most important. The engine uses the mod_rewrite substitution pattern recognition for making translations, and this means a good understanding of regular expressions can help you a lot.
Note: Regular expressions are so vast that does not fit within the scope of this article. I'll try to write another article on this subject someday.
1. RewriteRule Directive
The general syntax of the RewriteRule is very simple. Change RewriteRule pattern [flags]
The part of the pattern is the pattern that the rewrite engine will search the incoming URL and catches. So in our first sample first.html ^ $ is the pattern. The model is written as a regular expression.
Substitution is the replacement or translation to be done in the pattern captured in the URL. In our sample second.html replacement part.
The flags are optional and make the rewrite engine to make any tasks other than by making the replacement in the string of the URL. The flags if present are defined in brackets and should be separated by commas.
Let's take a look at a more complex rewrite rule. Take a look at the following URL.
http://yourwebsite/articles.php?category=stamps&id=122
Now let's turn the above URL in a search engine and user friendly URL like the one below.
http://yourwebsite/articles/stamps/122
Create a page called articles.php with the following code:
$ _GET = $ category ['category'];
$ Id id = $ _GET ['];
echo "Category:". $ Category. ""
echo "ID:". $ Id;
This page shows only two GET variables passed to the web page.
Open the htaccess. File and write the following article determined.
RewriteEngine on
RewriteRule ^ articles / ( w + +)/([ 0-9]) $ / Articles.php? Category = $ 1 & id = $ 2
The pattern ^ articles / ( w + +)/([ 0-9]) $ can be divided into:
Articles ^ / - check that the application is started with "articles /"
(W + ) / - Check if this part is a word followed by a slash. The parentheses are used to extract the values of the parameters we need to replace in the actual query string, in the substitution URL. The pattern, which is placed between parentheses is stored in a special variable that can be re-referred at the substitution using variables such as $ 1, $ 2 etc for each pair of parentheses.
([0-9 +]) $ - this control to the digits in the last part of the url.
Try to request the file on the server articles.php test given to the following URL.
http://yourwebsite/articles/coins/1222
The URL rewrite rule you have written will kick in and you will see the result as if the requested URL, where:
http://yourwebsite/articles.php?category=coins&id=1222
Now you can work in this example to build more and more complex URL Rewritting rules. Using URL rewriting in the previous example we have a search engine and user friendly URL, which is also tamper-proof against the kind of casual script kiddie injection attacks.
What is the parameter of the directive RewriteRule flags do? "
RewriteRule flags we provide a way to control how mod_rewrite handles each rule. These indicators are defined within a common set of brackets, separated by commas and there are about 15 flags to choose from. These flags range from those that control how rules are interpreted as a complex specific HTTP headers sent by the client when a match is found in the pattern.
Lets look some of the flags at base.
- [NC] flag (nocase) -. This makes mod_rewrite to treat the pattern in a case-sensitive way.
- [F] flag (forbidden) - This causes Apache to send a HTTP response header prohibited - Response 403 - back customer.
- [R flag] (redirect) - This option causes mod_rewrite to use an HTTP redirect rather formal redirection Apache internal. You can use this indicator to inform the customer about the flag redirection and this sends a secondment - Response 302 - default but this indicator takes an additional parameter, which can be used to modify the response code. If you want to send a response code of 301 - Moved Permanently - then this indicator can be written as [R = 301]
- [G] flag (Ido) - This option causes Apache to respond with an HTTP response 410 - File Gone.
- [L flag] (final) - This makes mod_rewrite to stop processing if the policy directives coming now is successful.
- [N flag] (next) - This flag causes rewriting engine to stop the process and loop back to the top of the list rules. A point to note is that the direction that will be used for pattern recognition, will be rewritten. This indicator can create an endless loop and care so far should be given if you are using.
There are other flags, but they are relatively complex to explain in the scope of this article so you can find more information on which to forward the mod_rewrite manual.
2. RewriteCond Directive
This directive gives additional power control subject to a number of parameters and conditions. This statement when combined with RewriteRule allows you to rewrite URLs based on the success conditions. RewriteCond are like the case of () in your programming language but are here to decide whether the substitution of a RewriteRule directive should have place or not. Things like hot linking prevention and check if the client meets certain criteria before rewriting the URL, etc. can be achieved by Use of this directive.
The general syntax of the RewriteCond is:
RewriteCond condition string-to-test-pattern
The part of a chain RewriteCond proof of access to a wide range of variables such as HTTP header variables, request variables, server variables, the variables of time, etc to I can do a lot of control when writing complex conditional directives. You can use any of these variables as a string to test it on a string) (% format. Suppose you want to use the HTTP_REFERER variable can then be used as% (HTTP_REFERER).
The condition can be part of a chain simple or very complex regular expression as your imagination is the only limit with this module.
Let's take a look at an example of conditional rewriting using RewriteCond Directive:
RewriteCond% (HTTP_USER_AGENT) ^ Mozilla / 4 (.*) MSIE
RewriteRule Index. Html $ / index.ie.html [L]
RewriteCond% (HTTP_USER_AGENT) ^ Mozilla / 5 (.*) Gecko
RewriteRule Index. Html $ / index.netscape.html [L]
RewriteRule Index. Html $ / index.other.html [L]
This example uses the HTTP_USER_AGENT as the test string with the RewriteCond directive. What it does is it uses HTTP_USER_AGENT header variable to find the visiting user's browser and the match against a set of pre-known values to detect the browser and serve different pages visitors based on the outcome of the game. The first RewriteCond checks the HTTP_USER_AGENT to find a match for the ^ Mozilla / 4 (.*) MSIE pattern. This match occurs when a user visits the page using Internet Explorer as your browser. Then the RewriteRule as little more than the statement will kick in and return to write the address of a page server index.ie.html IE visitors.
Similarly it is a specific browser mozilla control in the second and RewriteCond RewriteRule substitution will make index.netscape.html when a positive match in the ^ Mozilla / 5 (.*) Gecko pattern. The third RewriteRule is there to catch other browsers. If the first and second RewriteCond fails, then the last RewriteRule be considered. A highlight in the previous example is the use of the L flag] [with all the RewriteRule directives. This is used to prevent the cascade of applying the rules when a RewriteRule applies positive.
Two flags that can be used to better control how they behave directive RewriteCond [NC] - Between case sensitive - and [O] - chaining multiple RewriteCond directives with logical OR.
Using these two directives - RewriteRule RewriteCond and - you can implement a lot of powerful URL rewriting functions on its website.
Other mod_rewrite Directives
- RewriteBase directive - This directive can solve the problem of creating URL RewriteRule not exist due to the difference in the physical file structure system on the web server and web URL structure. Setting this directive to the following statement given can solve this problem.
RewriteBase /
- RewriteMap directive - This directive is very powerful because it allows you to assign unique values to a set of replacement values of others in a table and Using the substitution to generate URLs in progress. This can be especially useful for large e-commerce or in kind CMS applications where you need to replace the name of each section or category name in the URL with an ID for making a database.
- Directive RewriteLog - This directive can be used to set the log file that the engine of mod_rewrite is used for access to all actions taken during the processing of the request. The syntax is:
RewriteLog / path / to / logfile
This directive must be defined in the httpd.conf file, since the Directive is applied a per-server basis.
- RewriteLogLevel directive - This directive tells mod_rewrite the amount of information on the internal process is performed while rewriting URLs to be registered. This directive takes values of 0-9, where 0 means no logging and 9 means all information is recorded. A higher level of logging can make Apache run slow, so that a level above 2 is desired for debugging purposes only. This directive can be applied with that given below syntax.br />
Levelnumber RewriteLogLevel
Conclusion
In this paper we only took a brief look at the power of mod_rewrite. It's just a scratch on the surface, but I hope it is enough to start on using this module your web server environment.
About the Author
A research loving computer teacher interested in Paranormal Science, Martial Arts, Military History and Security, Pramod S Nair is now the C.T.O of Humming Bird Informatics - An Internet based business solutions provider.
Does anyone know where I can find the value of old knives in the network w / o ebay and buy a price guide?
I have two old knives Barlow, have found a lot of sites with the exact image of the knife, but I can not find anywhere that will give me an estimated value without paying for it, or buy a book! Ughhh! (Ebay and has no Theres .)--- be a site somewhere. HELP ??????
go to the local library and ask the librarians






























































































































