Dave Koopman

Started with Go Daddy in 2002 as a software developer in Email. In a team environment, we built Web-Based Email and Online Group Calendar. Since, positions include: Manager of Dedicated Hosting Development, Systems Architect, Manager of Mysql Operations, Email Architect, Chief Technology Officer, VP Product Development, Chief Scientist and most recently Principal Engineer - Hosting. When not innovating solutions at GoDaddy, hobbies include skiing, offroading, boating and camping. This is a personal blog and opinions are of my own and not necessarily that of my employer. I also author on hostingperformance.guru. Connect with me on Google.

Run two SSL sites on a single IP and port on Apache

February 6, 2008September 3, 2005 by Dave Koopman

The way Apache works, this cannot be done. Let me explain why:

Consider this request header for https://www.modphp.org/:

class Util – a handy thing to have around

February 6, 2008August 31, 2005 by Dave Koopman

I have a Util class that is in my library of tools. I find myself using these functions often, thought I would share….

I like keeping my functions in a class, that way I don’t worry about redefining functions.

Weird Internet Explorer Print Bug Involving IFRAME and TABLE

August 31, 2005 by Dave Koopman

I ran into a very strange bug with printing in IE. It happened in an online calendar program that I work on. Somebody showed me a printed page from IE 6 where the attendees, which are in an IFRAME, had this big 6 inch left margin. The table was pushed off the right edge of the paper, you couldn’t even read it. On screen, the page looked just fine, there was a 10 pixel border. I printed the same page in Firefox and it printed just fine.

Throttle down your bandwidth

January 28, 2008August 25, 2005 by Dave Koopman

Just found this, think I might try it out sometime:
http://www.xk72.com/charles/index.html

See what your site looks like with low bandwidth or latency. Also, Charles can act as a man-in-the-middle for HTTP/SSL communication, enabling you to debug the content of your HTTPS sessions, but I would recommend Mozilla LiveHeaders (http://livehttpheaders.mozdev.org/) for viewing headers, post data, etc..

Using Curl 101

October 24, 2011August 13, 2005 by Dave Koopman

To use Curl in PHP, you must have the Curl extension compiled in –with-curl, and you’ll want –with-openssl, if you need to be able to hit https pages.

Once you get PHP working with Curl (I could explain how to do that, but for this article, I am focusing on how to use it).

The code below is for PHP5, but I’m sure you could modify it to work with PHP4, just have to change the syntax a bit.

PHP Sessions using MySQL

April 12, 2013August 12, 2005 by Dave Koopman

MySQL sessions are “gotta have it” thing if your site ever grows beyond single server. If you have multiple servers behind a load balancer, you could keep session data on a shared SAN, but MySQL makes for a better session store.

Create a file called MySession.php and put this code in it, replace the definitions to match your database. Also, it requires the PEAR DB.php module, make sure you have pear DB installed: pear install DB.

Third party cookies not saved in IE, problem resolved

February 6, 2008July 27, 2005 by Dave Koopman

There was a problem when you logged into the admin panel with IE using default Privacy settings. Because the site is running in a frame under a different site, IE would not save your SESSION cookie, so you would be logged out on the next click.

Problems with multiple versions (4.0, 4.1) with mysqld_safe

May 6, 2008July 8, 2005 by Dave Koopman

I am running mysql-standard-4.0.20-pc-linux-i686 and mysql-standard-4.1.12-pc-linux-gnu-i686 on the same machine, installed binaries.
I had a heck of a time running both of these versions at once. And not for the typical reasons: port collision, sock file, etc… I have that all figured out, I should be able to run two versions of MySQL on the same machine. I am running 4.0 out of /usr/local/mysql and trying to run 4.1 out of /usr/local/mysql-4.1 and cannot get it working for the life of my, using the mysqld_safe script.