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gRPC: move text above gRPC diagram (#25)

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Update README.md  to move text above the gRPC diagram.

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Co-authored-by: PrakashB <prakash.bhandari@bigtincan.com>
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2023-10-23 09:59:44 +11:00
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@@ -169,14 +169,14 @@ GraphQL can aggregate multiple REST requests into one query. GraphQL server orga
### How does gRPC work? ### How does gRPC work?
<p>
<img src="images/grpc.jpg">
</p>
RPC (Remote Procedure Call) is called “**remote**” because it enables communications between remote services when services are deployed to different servers under microservice architecture. From the user’s point of view, it acts like a local function call. RPC (Remote Procedure Call) is called “**remote**” because it enables communications between remote services when services are deployed to different servers under microservice architecture. From the user’s point of view, it acts like a local function call.
The diagram below illustrates the overall data flow for **gRPC**. The diagram below illustrates the overall data flow for **gRPC**.
<p>
<img src="images/grpc.jpg">
</p>
Step 1: A REST call is made from the client. The request body is usually in JSON format. Step 1: A REST call is made from the client. The request body is usually in JSON format.
Steps 2 - 4: The order service (gRPC client) receives the REST call, transforms it, and makes an RPC call to the payment service. gRPC encodes the **client stub** into a binary format and sends it to the low-level transport layer. Steps 2 - 4: The order service (gRPC client) receives the REST call, transforms it, and makes an RPC call to the payment service. gRPC encodes the **client stub** into a binary format and sends it to the low-level transport layer.