You have applied the Microservice architecture pattern.Services must handle requests from the application’s clients. A RESTful Web API is an API over HTTP that follows the REST architectural pattern. Consider the tradeoffs between using a REST-style interface versus an RPC-style interface. It defines a uniform interface based on HTTP verbs, which encourages evolvability. gRPC. REST is an architectural pattern that is by convention used over HTTP but does not have to be over HTTP. It can play a major role in all synchronous communications between internal microservices. gRPC is a relatively new implementation of the Remote Procedure Call (RPC) API paradigm. So, a such call inherently tends to be more RPC-like. Pattern: Remote Procedure Invocation (RPI) Context. REST models resources, which can be a natural way express your domain model. Furthermore, services must sometimes collaborate to handle those requests. Soon your simple microservice has become an orchestrator which defies the microservice’s attribute “single in purpose”. The input is limited to … In this post, when I talk about RPC I talk about WYGOPIAO: What You GET Or POST Is An Operation.. With this type of RPC, you expose operations to manipulate data through HTTP as a … RPC: RPC, Remote Procedure Call, is an old mechanism in distributed computing, to execute certain procedure in a remote machine without having to understand the network details. While REST supports RPC data structures, it’s not the only API protocol in this category. REST, RPC, and Brokered Messaging are not mutually exclusive; they can all work together in your microservice architecture. However, lower compliance level does not necessarily mean statefulness, or higher coupling. About REST. If you like JSON, you may prefer instead to use JSON-RPC, a protocol introduced in the mid-2000s. RPC: The operation request style. REST is good between browser and back-end. The RPC acronym has many meanings and Remote Procedure Call has many forms. REST versus RPC. Forget REST, think RPC - AWS Lambda allows you to only execute one function - handleRequest(Object input, Context context). Probably, instead of thinking REST vs. RPC, you should use as much REST as possible, but no more. But we need something better than REST for inter microservices communication to avoid above mentioned issues. The reason why REST based microservices examples are most popular is more than likely due to their simplicity; services communicate directly and synchronously with each other over HTTP, without the need for any additional infrastructure. Great article. Addressing the security aspect for any future readers exploring messaging for their Microservice architecture. Blocking – When invoking a REST service, your service is blocked waiting for a response. As an example consider a system that notifies customers when a particular item is back in stock. 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