Developing an application in Haskell

Recently I have started a pet project to understand Haskell for web development. This project develops a Haskell application to talk to the IG streaming API which is a combination of a Restful API (for authentication and trading) and a Lightstreamer API for streaming realtime data. This allows me to investigate and understand the use of Haskell for the following functionalities:

1. Reading and writing JSON objects
2. Interacting with Restful API over HTTP(S)
3. Interacting directly with HTTP(S) connections
4. Managing concurrent threads
5. Reading and writing to a relational database such as Postgres

In the subsequent stories, I want to write down my experience with the above functionalities.