编写proto文件

syntax = "proto3";

package helloworld;

service Greeter {
  // unary call
  rpc SayHello(HelloRequest) returns (HelloReply);
  // server streaming call
  rpc SayRepeatHello(RepeatHelloRequest) returns (stream HelloReply);
}

message HelloRequest {
  string name = 1;
}

message RepeatHelloRequest {
  string name = 1;
  int32 count = 2;
}

message HelloReply {
  string message = 1;
}

编译proto文件

protoc -I=. helloworld.proto \
--js_out=import_style=commonjs,binary:. \
--grpc-web_out=import_style=commonjs,mode=grpcwebtext:.

在vue中导入编译生成的文件并向后端发送请求

<template>
  <div id="app">
    <a-button type="primary" @click="get1">
      简单rpc
    </a-button>
        <a-button type="primary" @click="get2">
      服务端流rpc
    </a-button>
  </div>
</template>
<script>
// 引入grpc-web生成的客户端，请求和返回参数
import {HelloRequest, RepeatHelloRequest,HelloReply} from "./proto/helloworld_pb";
import { GreeterClient } from "./proto/helloworld_grpc_web_pb";
export default {
  name: 'App',
  created(){
      // 创建grpc-web客户端，填入enovy的地址
      this.client = new GreeterClient('http://localhost:8080',null, null)
  },
   methods: {
        /**
         * 简单rpc
         */
       get1(){
           // 创建请求参数并赋值
            var request = new HelloRequest();
            request.setName('World');
            //  调用客户端相应的grpc方法，发送grpc请求，并接受后台发送回来的返回值
            this.client.sayHello(request, {}, (err, response) => {
              if (err) {
                console.log(`Unexpected error for sayHello: code = ${err.code}` +
                            `, message = "${err.message}"`);
              } else {
                //  打印返回的信息
                console.log(response.getMessage());
              }
            });
       },
        /**
         * 服务端流rpc
         */
       get2(){
           // 创建请求参数并赋值
            var streamRequest = new RepeatHelloRequest();
            streamRequest.setName('World');
            streamRequest.setCount(5);
            //  调用客户端相应的grpc方法，发送grpc请求，并接受后台发送回来的返回值
            var stream = this.client.sayRepeatHello(streamRequest, {});
            stream.on('data', (response) => {
                //  打印返回的信息
              console.log(response.getMessage());
            });
            stream.on('error', (err) => {
              console.log(`Unexpected stream error: code = ${err.code}` +
                          `, message = "${err.message}"`);
            });
       },
   }
}
</script>

<style>
</style>

配置envoy代理

admin:
  access_log_path: /tmp/admin_access.log
  address:
    socket_address: { address: 0.0.0.0, port_value: 9901 }

static_resources:
  listeners:
  - name: listener_0
    address:
      socket_address: { address: 0.0.0.0, port_value: 8080 }
    filter_chains:
    - filters:
      - name: envoy.filters.network.http_connection_manager
        typed_config:
          "@type": type.googleapis.com/envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager
          codec_type: auto
          stat_prefix: ingress_http
          route_config:
            name: local_route
            virtual_hosts:
            - name: local_service
              domains: ["*"]
              routes:
              - match: { prefix: "/" }
                route:
                  cluster: greeter_service
                  max_grpc_timeout: 0s
              cors:
                allow_origin_string_match:
                - prefix: "*"
                allow_methods: GET, PUT, DELETE, POST, OPTIONS
                allow_headers: keep-alive,user-agent,cache-control,content-type,content-transfer-encoding,custom-header-1,x-accept-content-transfer-encoding,x-accept-response-streaming,x-user-agent,x-grpc-web,grpc-timeout
                max_age: "1728000"
                expose_headers: custom-header-1,grpc-status,grpc-message
          http_filters:
          - name: envoy.filters.http.grpc_web
          - name: envoy.filters.http.cors
          - name: envoy.filters.http.router
  clusters:
  - name: greeter_service
    connect_timeout: 0.25s
    type: logical_dns
    http2_protocol_options: {}
    lb_policy: round_robin
    #win/mac hosts: Use address: host.docker.internal instead of address: localhost in the line below
    load_assignment:
      cluster_name: cluster_0
      endpoints:
        - lb_endpoints:
            - endpoint:
                address:
                  socket_address:
                    address: 0.0.0.0
                    port_value: 9090