About this tutorial

Forty percent of eBay's listings are driven by applications that use eBay's Web services. Half of these listings are from applications written by third-party developers. eBay handles over one billion requests every month from its Web services API. This means two things: a lot of people use eBay through vendor-supplied applications, and these applications could probably be doing more caching.

It's very important to eBay that people begin developing applications using their Web services API because, while there's money to be made by helping people have virtual rummage sales, there's real money to be made by helping retailers put their entire business online. That means there's money to be made by writing applications to help eBay help put businesses online. And, like a good partner, eBay is working hard to give you, the developer, everything you need to write applications that will make money for you and make money for eBay. If you don't like the mercenary aspect and you're a fan of Richard Dawkins, think of it this way: eBay is an evolutionary strategy for the junk in your garage to get from where it is (with you and unappreciated) to where it wants to be (somewhere else and appreciated). The distribution of capital is the factor that helps motivate you to optimize the transfer.

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Table of contents

• About this tutorial
• Before you start
• Introduction
• Conduct an eBay search
• Write the code
• Conduct the eBay query
• Get the query results
• Wrap-up
• Resources
• About the author

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