Soon your simple microservice has become an orchestrator which defies the microservice’s attribute “single in purpose”. Pattern: Remote Procedure Invocation (RPI) Context. While REST supports RPC data structures, it’s not the only API protocol in this category. Probably, instead of thinking REST vs. RPC, you should use as much REST as possible, but no more. REST, RPC, and Brokered Messaging are not mutually exclusive; they can all work together in your microservice architecture. So, a such call inherently tends to be more RPC-like. 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. gRPC. REST is good between browser and back-end. The RPC acronym has many meanings and Remote Procedure Call has many forms. While REST is decidedly modern, gRPC is actually a new take on an old approach known as RPC, or Remote Procedure Call. Compared to REST and SOAP, JSON-RPC is relatively narrow in scope. This is REST in a nutshell, and is an example of a use case in which a lightweight, stateless system is exactly what is needed to deliver the resources to the end client. REST versus RPC. It defines a uniform interface based on HTTP verbs, which encourages evolvability. Addressing the security aspect for any future readers exploring messaging for their Microservice architecture. REST is an architectural pattern that is by convention used over HTTP but does not have to be over HTTP. The table above shows only the HTTP verbs used commonly by RPC and REST APIs. Blocking – When invoking a REST service, your service is blocked waiting for a response. REST. Sure you can update the code to add the new endpoint, but that displays the flaw: unnecessary coupling. A RESTful Web API is an API over HTTP that follows the REST architectural pattern. gRPC is a relatively new implementation of the Remote Procedure Call (RPC) API paradigm. It can play a major role in all synchronous communications between internal microservices. 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. 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 … Do not twist your application just to fit with the RESTful compliance standards. But we need something better than REST for inter microservices communication to avoid above mentioned issues. However, lower compliance level does not necessarily mean statefulness, or higher coupling. You have applied the Microservice architecture pattern.Services must handle requests from the application’s clients. Furthermore, services must sometimes collaborate to handle those requests. Forget REST, think RPC - AWS Lambda allows you to only execute one function - handleRequest(Object input, Context context). REST models resources, which can be a natural way express your domain model. About REST. The input is limited to … If you like JSON, you may prefer instead to use JSON-RPC, a protocol introduced in the mid-2000s. RPC: The operation request style. Great article. Consider the tradeoffs between using a REST-style interface versus an RPC-style interface. As an example consider a system that notifies customers when a particular item is back in stock. Pattern: Remote Procedure Call ( RPC ) API paradigm does not have to be more RPC-like HTTP. Not have to be more RPC-like as much REST as possible, that. 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