Hertz 学习笔记（27）

今天学客户端的流式读

使用 hertz 客户端的流式读取响应示例

/*
 * Copyright 2022 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 (
	"context"
	"fmt"
	"io/ioutil"

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

func main() {
	c, _ := client.NewClient(client.WithResponseBodyStream(true))
	req := &protocol.Request{}
	resp := &protocol.Response{}
	req.SetMethod(consts.MethodGet)
	req.SetRequestURI("http://127.0.0.1:8080/streamWrite")
	err := c.Do(context.Background(), req, resp)
	if err != nil {
		return
	}
	bodyStream := resp.BodyStream()
	p := make([]byte, resp.Header.ContentLength()/2)
	_, err = bodyStream.Read(p)
	if err != nil {
		fmt.Println(err.Error())
	}
	left, _ := ioutil.ReadAll(bodyStream)
	fmt.Println(string(p), string(left))
}

需要配合服务端的例子来使用，这里同样是创造一个流，长度是响应头的一半，这样保证了肯定不是一次性读完的。