ToxiProxy allows you to create a controllable proxy between your app and a remote service when you want to test network reliability and related effects. It can be downloaded in command line executable form that, when run, will start up a web service on port 8474. You can configure it using a REST client (eg Postman or cURL). Say you want to configure a proxy for a remote service running on somewhere.

After the Leaflet example I was given another assignment in the Coursera Developing Data Products course. This time the goal was to use Shiny to demonstrate some interactive data analysis and visualisation. I picked two areas I’m fond of, books and sentiment analysis, and combined them to produce the Gutenberg Sentiment Analyser! Here is how to use it: Search for an author and pick one. Similarly in the word cloud tab the books are dissected and visualised.

As part of the Coursera Developing Data Products course I took recently we were asked to produce an example of an interactive R markdown document using Leaflet. So I generated some random cat sightings in and around London, piped them into Leaflet and it produces this sort of map: The map automatically clusters the cat locations so that as you zoom in the clusters expand into individual kitties; zoom out and they merge into clusters again, showing their counts.