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http 服务器
package main
import (
"log"
"net/http"
"time"
)
func main() {
// 创建路由器
mux := http.NewServeMux()
// 设置路由规则
mux.HandleFunc("/hello", sayHello)
// 创建服务器
server := &http.Server{
Addr: ":1210",
WriteTimeout: time.Second * 3,
Handler: mux,
}
// 监听端口并提供服务
log.Println("starting httpserver at http:localhost:1210")
log.Fatal(server.ListenAndServe())
}
func sayHello(w http.ResponseWriter, r *http.Request) {
time.Sleep(1 * time.Second)
w.Write([]byte("hello hello, this is httpserver"))
}
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启动服务器
$ go run demo/base/http/server/server.go
2021/05/31 22:26:35 starting httpserver at http:localhost:1210
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使用 浏览器 或者 命令行测试一下:
$ curl -v http://localhost:1210/hello
* Trying ::1:1210...
* Connected to localhost (::1) port 1210 (#0)
> GET /hello HTTP/1.1
> Host: localhost:1210
> User-Agent: curl/7.69.1
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Date: Mon, 31 May 2021 14:28:28 GMT
< Content-Length: 31
< Content-Type: text/plain; charset=utf-8
<
* Connection #0 to host localhost left intact
hello hello, this is httpserver
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hello hello, this is httpserver
http 客户端
为什么需要客户端
在多项目、微服务的场景下,项目服务之间的互相通信并不像。使用浏览器、命令行输入域名返回结果。所以需要自己编写发起 http 请求的客户端,实现项目服务之间的通信
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
"time"
)
func main() {
// 创建连击池
transport := &http.Transport{
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
MaxIdleConns: 100, // 最大空闲连接数
IdleConnTimeout: 90 * time.Second, // 空闲超时时间
TLSHandshakeTimeout: 10 * time.Second, // tls 握手超时时间
ExpectContinueTimeout: 1 * time.Second, // 100-continue状态码超时时间
}
// 创建客户端
client := &http.Client{
Transport: transport,
Timeout: 30 * time.Second, // 没饿
}
// 请求数据
resp, err := client.Get("http://localhost:1210/hello")
if err != nil {
panic(err)
}
defer resp.Body.Close()
// 读取数据
bds, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err)
}
fmt.Println(string(bds))
}
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go run demo/base/http/server/server.gohello hello, this is httpserver