diff --git a/main.go b/main.go
index 0a8bb7c..4a0d88f 100644
--- a/main.go
+++ b/main.go
@@ -62,7 +62,10 @@ func main() {
 			switch strings.ToLower(k) {
 			case "content-length":
 			default:
-				req.Header.Set(k, v)
+				req.Header.Set(k, v[0])
+				for _, v := range req.Header[1:] {
+					req.Header.Add(k, v)
+				}
 			}
 		}
 		resp, err := c.Do(req)