refactor(server):重构HTTP服务器实现

- 将原始main函数中的HTTP处理逻辑拆分到独立文件
- 新增main1.go实现基础HTTP服务器功能
- 新增main2.go增强路由处理和重定向逻辑
- 新增main3.go使用标准库处理程序优化代码结构
- 更新main.go调用新的main3函数并注释其他入口点
- 移除main.go中旧的HTTP处理相关导入和类型定义

24-httpserver/httpserver/main1.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"io"
+	"net/http"
+)
+
+type StringHandle1 struct {
+	message string
+}
+
+func (sh *StringHandle1) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+
+	Printfln("\n----------\nMethod: %v Protocol: %v Host: %v URL: %v URL.Host: %v RequestURI: %v",
+		request.Method, request.Proto, request.Host,
+		request.URL.String(), request.URL.Host, request.RequestURI)
+	for name, val := range request.Header {
+		Printfln("Header: %v = %v", name, val)
+	}
+	Printfln("RemoteAddr: %v", request.RemoteAddr)
+	Printfln("ContentLength: %v", request.ContentLength)
+	Printfln("Body: %v", request.Body)
+	Printfln("TLS: %v", request.TLS)
+	Printfln("--------------")
+	if request.URL.Path == "/favicon.ico" {
+		Printfln("Request for favicon.ico detected - returning 404")
+		Printfln("--------------\n")
+		writer.WriteHeader(http.StatusNotFound)
+		return
+	}
+	writeLen, err := io.WriteString(writer, sh.message)
+	if err != nil {
+		Printfln("ServeHTTP Error: %v", err)
+		return
+	}
+	Printfln("ServeHTTP Wrote %d bytes", writeLen)
+	Printfln("--------------\n")
+}
+
+func main1() {
+	err := http.ListenAndServe("localhost:5000", &StringHandle1{message: "Hello World!"})
+	if err != nil {
+		Printfln("ListenAndServe Error: %v", err)
+		return
+	}
+}