Dr. Christian Winkler

Searching OpenStreetMap Geospatial Data with Solr

We are currently experiencing a Geospatial Revolution that changes in how we navigate from A to B and how we search for locations like a specific sight or restaurants nearby. Geospatial search technology provides such information. This article shows how commercial applications can utilize geospatial search, e.g. for real estate search (qualifing real estates by their distance to the nearest kindergartens, schools, doctors, etc.), calculating building density in cities and so on.

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Securing your Password Database with bcrypt

Do you also spend sleepless nights because you have saved the passwords of your users in clear text or near-clear text (MD5)? We will show you a simple method how you can smoothly migrate your password database to a much more secure format. The transition is transparent to the users and instant, i.e. as soon as you have implemented the process, your passwords are safe. If you still store your passwords in an insecure format, you should convert them to a secure format as soon as possible. Do it now!

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Ultra-Performant Dynamic Websites with Varnish

This article describes how we configured and used the Varnish web cache for the popular German online shop www.lidl.de. Varnish gave us a tremendous performance boost. With this new caching setup, we easily achieve request rates of several thousand pages per second, which are quite common during marketing campaigns like special offers.

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Must-Know URL Hash Techniques for AJAX Applications

By coding the page state into the URL, even single-page web applications can support deep bookmarks and the browser’s back button. The most accepted approach is to utilize the location hash, i.e. the local part of the URL. This article explains this technique and what pitfalls you should be aware of, based on my team’s experience from building an AJAX interface for Solr. You will also learn about the HTML5 History API, which is a second, more modern technique.

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