While you may think HTTP is just a protocol for downloading HTML files, this idea is wrong. HTTP is used daily for transferring many different types of files, from HTML to several graphic formats (JPEG, PNG, GIF, etc) to Cascade Style Sheets (CSS) to JavaScript files and many others.
In this post you can study the way the city bicycle service (Valenbisi) works in order to provide an application the location of the different bike stations and the current state of each one. Here the body of each HTTP response is an XML file.
Armed with this knowledge, this site was created and, believe it or not, it turns out to be much more useful than the "official" one.
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