HTTP Server in Golang

main.go

package main

import (
	"fmt"
	"net"
	"strings"
)

type HttpRequest struct {
	Method  string
	Path    string
	Headers map[string]string
	Body    string
}

type HttpResponse struct {
	Headers    map[string]string
	Status     string
	Body       string
	StatusCode int
}

func (r *HttpResponse) String() string {
	return fmt.Sprintf("HTTP/1.1 %d %s\n%s\n\n%s", r.StatusCode, r.Status, r.Headers, r.Body)
}

func parseRequest(request string) HttpRequest {
	lines := strings.Split(request, "\n")
	firstLine := strings.Split(lines[0], " ")
	method := strings.TrimSpace(firstLine[0])
	path := strings.TrimSpace(firstLine[1])
	headers := make(map[string]string)
	var i int
	for i = 1; i < len(lines); i++ {
		line := strings.TrimSpace(lines[i])
		if line == "" {
			i++
			break
		}
		parts := strings.SplitN(line, ": ", 2)
		headers[strings.TrimSpace(parts[0])] = strings.TrimSpace(parts[1])
	}
	body := strings.Join(lines[i:], "\n")
	return HttpRequest{method, path, headers, body}
}

func handleConnection(c net.Conn) {
	buf := make([]byte, 1024)
	_, err := c.Read(buf)
	if err != nil {
		fmt.Println("Error reading:", err)
	}
	request := parseRequest(string(buf))

	fmt.Println("Method:", request.Method)
	fmt.Println("Path:", request.Path)
	fmt.Println("Headers:", request.Headers)
	fmt.Println("Body:", request.Body)

	response := HttpResponse{
		Headers: map[string]string{
			"Content-Type": "text/html",
		},
		Status:     "OK",
		StatusCode: 200,
		Body:       "<h1>Hello, World!</h1>",
	}

	c.Write([]byte(response.String()))
	c.Close()
}

func main() {
	conn, err := net.Listen("tcp", "127.0.0.1:3000")
	if err != nil {
		fmt.Println("Error listening:", err)
	}
	defer conn.Close()

	fmt.Println("Server listening on 127.0.0.1:3000")

	for {
		c, err := conn.Accept()
		if err != nil {
			fmt.Println("Error accepting connection:", err)
		}
		go handleConnection(c)
	}
}