优化参数拼接

src/handler/proxyhandler.go

@@ -165,7 +165,22 @@ func Proxy(c *gin.Context) {
 			reqURL.RawQuery = c.Request.URL.RawQuery
 		} else {
 			if c.Request.URL.RawQuery != "" {
-				reqURL.RawQuery += "&" + c.Request.URL.RawQuery
+				oldQ := c.Request.URL.Query()
+				newQ := c.Request.URL.Query()
+				for k, v := range newQ {
+					if len(v) > 1 {
+						for kk, vv := range v {
+							if kk == 0 {
+								oldQ.Set(k, vv)
+							} else {
+								oldQ.Add(k, vv)
+							}
+						}
+					} else {
+						oldQ.Set(k, v[0])
+					}
+				}
+				reqURL.RawQuery = oldQ.Encode()
 			}
 		}