main.go

/*
 * Copyright 2023 CloudWeGo Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package main

import (
	"bytes"
	"context"
	"fmt"
	"time"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/client"
	"github.com/cloudwego/hertz/pkg/app/server"
	"github.com/cloudwego/hertz/pkg/protocol"
	"github.com/cloudwego/hertz/pkg/protocol/consts"
)

func main() {
	h := server.Default(server.WithHostPorts("127.0.0.1:8080"), server.WithStreamBody(true))

	h.POST("/trailer", handler)

	go h.Spin()

	time.Sleep(time.Second)

	doRequest()
}

func doRequest() {
	c, _ := client.NewClient(client.WithResponseBodyStream(true))
	req := &protocol.Request{}
	resp := &protocol.Response{}
	req.SetMethod(consts.MethodPost)
	req.SetRequestURI("http://127.0.0.1:8080/trailer")

	bs := bytes.NewReader([]byte("ping"))
	req.SetBodyStream(bs, -1)

	// client set trailer
	req.Header.Trailer().Set("Client", "hertz")
	req.Header.Trailer().Set("Hertz", "test")

	err := c.Do(context.Background(), req, resp)
	if err != nil {
		return
	}

	fmt.Println("read trailer before reading body: ")
	resp.Header.Trailer().VisitAll(func(key, value []byte) {
		fmt.Printf("client receive trailer: %q: %q\n", key, value)
	})

	_ = resp.Body()

	fmt.Println()
	fmt.Println("read trailer after reading body: ")
	fmt.Printf("client receive trailer: Server: %q\n", resp.Header.Trailer().Get("Server"))
	fmt.Printf("client receive trailer: Hertz: %q\n", resp.Header.Trailer().Get("Hertz"))
}

func handler(ctx context.Context, c *app.RequestContext) {
	fmt.Println("read trailer before reading body: ")
	c.Request.Header.Trailer().VisitAll(func(key, value []byte) {
		fmt.Printf("server receive trailer: %q: %q\n", key, value)
	})
	_ = c.Request.Body()
	fmt.Println()
	fmt.Println("read trailer after reading body: ")
	fmt.Printf("server receive trailer: Client: %q\n", c.Request.Header.Trailer().Get("Client"))
	fmt.Printf("server receive trailer: Hertz: %q\n", c.Request.Header.Trailer().Get("Hertz"))
	fmt.Println()

	bs := bytes.NewReader([]byte("Hello World"))
	c.SetBodyStream(bs, -1)

	// server set trailer
	c.Response.Header.Trailer().Set("Server", "hertz")
	c.Response.Header.Trailer().Set("Hertz", "trailer_test")
}