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1947 - Perl substitute - the e modifier
Here's a graphic illustration of the use of the "e" for "execute" modifier used on the end of substitute operation in Perl. The "s" for substitute allows you to replace a matched pattern with a STRING in which you can use special references like \1 or $1 for the first matched substring. If you wan ....

1946 - Variable Types in Perl
In Perl, you have "autovivification" where variables are created when they have a values set in them, without the need to declare them. Some authorities will tell you that they are also "autotyped" in that Perl knows what to store in them automatically too, and to some extent that's true ... but t ....

1945 - Summary - Apache httpd build on Linux
As a regular user: 1002 tar xzf httpd-2.2.10.tar.gz 1003 cd httpd-2.2.10 1004 ./configure --prefix=/usr/local/apache_2.2.10 \    --enable-rewrite --enable-so --enable-proxy \    --enable-proxy-http --enable-proxy-ajp \    --enable-proxy-balancer ....

1944 - Forwarding session and cookie requests from httpd to Tomcat
If you're using mod_proxy to forward requests that use sessions to other servers, you need to ensure that the cookies get correctly rewritten as they're sent to the browser for setting, in order to reflect the URL of the customer facing server rather than the back end server. Here's an example wher ....

1943 - Port and Glasses
I don't expect you've seen my picture with TCP port numbers coming out of my head very often, have you? In fact this may be the first picture of me in glasses that I've published here. That's not a vanity thing - just that it's only been over the course of this year that I've had to join the majo ....

1942 - Christmas scenes and events
Melksham's Market Square hosts a Christmas Tree each year, and there are lights on the Town Hall. Although it's still a fortnight to the big day, Christmas Parties are in full swing ... indeed, both Lisa and I were out last Thursday evening, and we hosted an event at Well House Manor the following ....

1941 - Server - Service - Engine - Host, Tomcat
A Tomcat Server can run one or more Services. Each Service comprises a number of Connectors and an Engine, which contains one or more Hosts. You connect to a Tomcat Server via an appropriate connector, which defines the port number, the protocol, and various other connection parameters, and within ....

1940 - URL rewriting with front and back servers
If you ask someone to double a number, they'll come back to you and tell you twice the number you gave them - give the "3" and they'll say "6". But if you tell them to double the number every time they handle it, but refer it to someone else for them to validate it, you'll get "12" back. Since the ....

1939 - mod_proxy_ajp and mod_proxy_balancer examples
One of the major enhancements in release 2.2 of Apache httpd is the addition of the mod_proxy_ajp and mod_proxy_balancer modules to the standard distribution. Gone are the days of needing to build special modules such as Jserv, jk, jk2 and warp to have httpd act as a "front" to a Java (Tomcat) serv ....

1938 - Predictive Load Balancing - PHP and / or Java
Load Balancing Algorithms - the standard offerings How do you share out the requests when you're load balancing? The computer (or other device) that's sharing out the load needs to make a decision as to where it should forward each request, and there are a number of different option commonly avail ....

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