How to build a server in golang

The method for building a server in golang is: 1. Create a Go sample file and import the net/http package; 2. Write a processing function, read the request and write the response in the function; 3. Register the processor , all requests to be processed on the server must be registered with the handler; 4. After running the code, the browser can access the web server.

Operating system for this tutorial: Windows 10 system, Go1.20.1 version, Dell G3 computer.

To build a server in the Go programming language, you can use the standard library net/http. The following are the basic steps to build a simple HTTP server:

1. Import the net/http package:

import "net/http"

2. Write the processing function

In the processing function, We need to read the request and write out the response.

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!") // 将 "Hello, World!" 响应回到客户端.
}

3. Register handler

All requests to be processed on the server must be registered with the handler.

func main() {
    http.HandleFunc("/", handler)       // 将 "/" 路径绑定为我们创建的处理器函数.
    log.Fatal(http.ListenAndServe(":8080", nil)) // 启动web服务器，端口是 8080。
}

The complete code is as follows:

package main
import (
    "fmt"
    "log"
    "net/http"
)
// request handler
func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!")
}
func main() {
    http.HandleFunc("/", handler)
    log.Fatal(http.ListenAndServe(":8080", nil))
}

After running the above code, visit http://localhost:8080 in the browser, and you can see the return result of Hello, World! .

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