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@grpc-web/middleware
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Readme
gRPC Web middleware for Express and Connect.
For standalone proxy, see
@grpc-web/proxy
npm install @grpc-web/middleware
This middleware proxies gRPC Web requests to the given gRPC server and can be used with existing Express and Connect applications. Here is a full working example of a proxy server created using express
and cors
packages:
const express = require('express');
const cors = require('cors');
const grpcWeb = require('@grpc-web/middleware');
const app = express();
app.use(cors({ exposedHeaders: ['grpc-status', 'grpc-message'] }));
app.use(grpcWeb('http://localhost:9090'));
app.listen(8080);
In above example, express
can be replaced with connect
. The address http://localhost:9090
refers to the gRPC server address to which gRPC Web requests are forwarded to and 8080
refers to the port on which the proxy server is running.
gRPC Web middleware only handles gRPC Web requests and ignores normal HTTP requests, so it can be used together with normal web applications:
app.use(grpcWeb('http://localhost:9090'));
app.get('/', (req, res) => {
res.send('Hello World');
});
It can be run in the same process as the gRPC server:
// Express or Connect server
app.use(grpcWeb('http://localhost:9090'));
app.listen(8080);
// gRPC server
const server = new grpc.Server();
server.addProtoService(service, implementation);
server.bind('0.0.0.0:9090', credentials);
server.start();
It also accepts a custom function which can used for configuring the HTTP/2 connection to the gRPC server:
const http2 = require('node:http2');
app.use(
grpcWeb(() => {
return http2.connect('http://localhost:9090');
})
);
FAQs
gRPC Web middleware for Express and Connect.
The npm package @grpc-web/middleware receives a total of 520 weekly downloads. As such, @grpc-web/middleware popularity was classified as not popular.
We found that @grpc-web/middleware demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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