feat(server): 添加网关代理功能

- 实现了 HTTP 请求转发功能，支持请求头和响应头的完整复制
- 添加了目标 URL 构建逻辑，处理路径和查询参数的正确拼接
- 集成了响应体读取和状态码设置功能
- 实现了 WebSocket 连接的反向代理处理
- 添加了缓存机制用于临时存储主机信息
- 集成了日志记录功能用于错误跟踪和调试

server/gateway.go

@@ -0,0 +1,76 @@
+package server
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"time"
+
+	"git.magicany.cc/black1552/gf-common/log"
+	"github.com/gogf/gf/v2/net/gclient"
+	"github.com/gogf/gf/v2/net/ghttp"
+	"github.com/gogf/gf/v2/os/gcache"
+	"github.com/gogf/gf/v2/os/gctx"
+)
+
+func BuildRequest(r *ghttp.Request, host string) {
+	client := gclient.New()
+	// 构建目标URL而不是直接复制RequestURI
+	targetURL := host + r.URL.Path
+	if r.URL.RawQuery != "" {
+		targetURL += "?" + r.URL.RawQuery
+	}
+	// 复制请求头
+	for key, values := range r.Header {
+		for _, value := range values {
+			client.SetHeader(key, value)
+		}
+	}
+	response, err := client.DoRequest(gctx.New(), r.Method, targetURL, r.GetBody())
+	if err != nil {
+		log.Error(gctx.New(), "request error:", err)
+		panic(fmt.Sprintf("request error: %v", err))
+	}
+	defer response.Body.Close()
+	// 读取响应体
+	respBody, err := io.ReadAll(response.Body)
+	if err != nil {
+		log.Error(gctx.New(), "read response body error:", err)
+		panic(fmt.Sprintf("read response body error: %v", err))
+	}
+
+	// 复制响应头
+	for key, values := range response.Header {
+		for _, value := range values {
+			r.Response.Header().Add(key, value)
+		}
+	}
+	gcache.Set(gctx.New(), "host", host, 1*time.Second)
+	// 设置响应状态码并写入响应体
+	r.Response.Status = response.StatusCode
+	r.Response.Write(respBody)
+}
+
+// ProxyWebSocket 处理 WebSocket 连接的代理
+func ProxyWebSocket(r *ghttp.Request, targetHost string) {
+	// 解析目标主机 URL
+	targetURL, err := url.Parse(targetHost)
+	if err != nil {
+		log.Error(gctx.New(), "parse target host error:", err)
+		r.Response.WriteStatus(http.StatusInternalServerError)
+		r.Response.Write([]byte("Invalid target host"))
+		return
+	}
+
+	// 创建反向代理
+	proxy := httputil.NewSingleHostReverseProxy(targetURL)
+
+	// 修改请求 URL，保留原始路径和查询参数
+	r.URL.Scheme = targetURL.Scheme
+	r.URL.Host = targetURL.Host
+	log.Info(gctx.New(), r.GetBodyString())
+	// 处理 WebSocket 连接
+	proxy.ServeHTTP(r.Response.Writer, r.Request)
+}