- Feign
  - clients
    - java.net.URL
    - Apache HTTP
    - Apache HC5
    - Google HTTP
    - Java 11 Http2
    - OK Http
    - Ribbon
  - async clients
    - java.net.URL
    - Apache HC5
  - contracts
    - Feign
    - JAX-RS
    - JAX-RS 2
    - Spring 4
    - SOAP
    - Spring boot (3rd party)
  - encoders/decoders
    - GSON
    - Jackson 1
    - Jackson 2
    - Jackson JAXB
    - Sax
  - metrics
    - Dropwizard Metrics 5
    - Micrometer
  - extras
    - Hystrix
    - SLF4J
    - Mock