refactor: pass api_url through context (#457)

* refactor: pass `api_url` through context

* 移除 LinkArgs.HttpReq

* pref(alias): 减少不必要下载代理

* 修复bug

* net: 支持1并发 分片下载

server/webdav.go

@@ -1,7 +1,6 @@
 package server
 
 import (
-	"context"
 	"crypto/subtle"
 	"net/http"
 	"path"
@@ -11,7 +10,6 @@ import (
 	"github.com/OpenListTeam/OpenList/server/middlewares"
 
 	"github.com/OpenListTeam/OpenList/internal/conf"
-	"github.com/OpenListTeam/OpenList/internal/model"
 	"github.com/OpenListTeam/OpenList/internal/op"
 	"github.com/OpenListTeam/OpenList/internal/setting"
 	"github.com/OpenListTeam/OpenList/server/webdav"
@@ -45,9 +43,7 @@ func WebDav(dav *gin.RouterGroup) {
 }
 
 func ServeWebDAV(c *gin.Context) {
-	user := c.MustGet("user").(*model.User)
-	ctx := context.WithValue(c.Request.Context(), "user", user)
-	handler.ServeHTTP(c.Writer, c.Request.WithContext(ctx))
+	handler.ServeHTTP(c.Writer, c.Request.WithContext(c))
 }
 
 func WebDAVAuth(c *gin.Context) {