Communication between Microservices: Spring cloud OpenFeign vs WebClient/RestTemplate

Question

Any idea please about the best way to use for back to back communication ?

spring cloud OpenFeign or WebClient/RestTemplate ?

I think Feign client should be used when spring cloud gateway need to

communicate to other microservices, whereas WebClient/RestTemplate should be used for back to back communication.

Am I wrong ?

Feign is declarative, the others are imperative. Feign is useful if you want to share a client — spencergibb, Nov 30 '20 at 01:44
@spencergibb okey, and what about the communication between microservices, is there any differences ? — Amir Choubani, Nov 30 '20 at 07:31
RestTemplate is now deprecated. When you go with any distributing incoming calls using Ribbon Load balancer then easily use feign client with Ribbon load balancer with feignclient and Ribbonclient annotations. — dneranjan, Nov 30 '20 at 10:40

Ravi Parekh · Accepted Answer · 2021-09-01T15:21:28.820

WebClient (RestTemplate - deprecated to support WebClient)

Supports reactive call
underlying HTTP client libraries such as Reactor Netty
Part of spring framework - WebFlux || Doc will give you more
Comes in 2 flavour - Annotation and functional way

Personally I found it very useful while working with OAuth2 creating bean webClient, before making call it needs to be authenticated with token, ServerOAuth2AuthorizedClientExchangeFilterFunction will ease each call with just one time configuration

OpenFeign

Reactive - need to use 3rd party - com.playtika.reactivefeign
Fits best if you want call in blocking way
Part of Spring cloud
Netflix fully transferred Feign to the open-source community under a new project named OpenFeign

1 Answers1