gRPC (RPC)

There are no gRPC client for the browser. (Protocol Buffers does not support the browser.)

This means we cannot call gRPC enpdoints directly from the browser; we always need to call gRPC enpdoints from our Node.js server.

For fetching data, we can simply use a onBeforeRender() hook, since onBeforeRender() hooks are called in Node.js.

For mutating data:

1. We create a new HTTP endpoint. For example, if we use Express.js:

   // Environment: Node.js
   
   import express from 'express'
   
   const app = express()
   app.use(express.json()) // Parse the HTTP request body as JSON
   
   app.post('/mutations/updateText', (req, res) => {
     const { text } = req.body
     // We can call gRPC enpdoints here
   })

2. We then call our HTTP endpoint from the browser.

   // Environment: Browser
   
   const body = JSON.stringify({ text: 'Some new text' })
   await fetch('/mutations/updateText', { body })