At a hackathon one of the participants made an application on car license plates and technical info about a car. The app requested information from a public sector body through their regular website form that provides that info. After a few hours the app stopped working. Apparently the cause was that the website automatically blocked multiple requests from the same IP address. As if it was placing a burden on their web traffic!
We circumvented it by using various different webservers to generate the requests to the gov website. So the app's requests looked like they were coming from...

