title: How to use Apache Nifi to query a REST API?
body: <p>For a project i need to develop an ETL process (extract transform load) that reads data from a (legacy) tool that exposes its data on a REST API. This data needs to be stored in amazon S3.</p>
  
  <p>I really like to try this with apache nifi but i honestly have no clue yet how i can connect with the REST API, and where/how i can implement some business logic to 'talk the right protocol' with the source system. For example i like to keep track of what data has been written so far so it can resume loading where it left of.</p>
  
  <p>So far i have been reading the nifi documentation and i'm getting a better insight what the tool provdes/entails. However it's not clear to be how i could implement the task within the nifi architecture.</p>
  
  <p>Hopefully someone can give me some guidance?</p>
  
  <p>Thanks,
  Paul</p>