text: **Advanced Topics**
  
  You can connect a microservice with a REST API and a single integration to a Lambda function. As 
  
  you progress on your journey, you should explore the following advanced topics. 
  
  • Choose between REST and HTTP APIs 
  
  • Explore non-proxy custom integrations and data transformation 
  
  • Optimize your API with caching 
  
  • Explore HTTP APIs 
  
  • Learn how to use proxy routes and resources 
  
  • Send binary media types 
  
  • Explore bidirectional connections using WebSocket APIs 
  
  • Build and export your API using an OpenAPI 3 deﬁnition 