diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index f6a4a60e..ff7c75ca 100644
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -1183,6 +1183,7 @@ def add_webdav(ap):
     ap2.add_argument("--dav-mac", action="store_true", help="disable apple-garbage filter -- allow macos to create junk files (._* and .DS_Store, .Spotlight-*, .fseventsd, .Trashes, .AppleDouble, __MACOS)")
     ap2.add_argument("--dav-rt", action="store_true", help="show symlink-destination's lastmodified instead of the link itself; always enabled for recursive listings (volflag=davrt)")
     ap2.add_argument("--dav-auth", action="store_true", help="force auth for all folders (required by davfs2 when only some folders are world-readable) (volflag=davauth)")
+    ap2.add_argument("--dav-ua1", metavar="PTN", type=u, default=r" kioworker/", help="regex of tricky user-agents which expect 401 from GET requests; disable with [\033[32mno\033[0m] or blank")
 
 
 def add_tftp(ap):
diff --git a/copyparty/httpcli.py b/copyparty/httpcli.py
index 2fee6b80..c8209717 100644
--- a/copyparty/httpcli.py
+++ b/copyparty/httpcli.py
@@ -1794,7 +1794,7 @@ class HttpCli(object):
     def handle_cpmv(self) -> bool:
         dst = self.headers["destination"]
 
-        # dolphin (KIO/6.10) "webdav://127.0.0.1:3923/a/b.txt"
+        # dolphin (kioworker/6.10) "webdav://127.0.0.1:3923/a/b.txt"
         dst = re.sub("^[a-zA-Z]+://[^/]+", "", dst).lstrip()
 
         if self.is_vproxied and dst.startswith(self.args.SRS):
@@ -4836,9 +4836,12 @@ class HttpCli(object):
         # that the client is not a graphical browser
         if (
             rc == 403
-            and not self.pw
-            and not self.ua.startswith("Mozilla/")
+            and self.uname == "*"
             and "sec-fetch-site" not in self.headers
+            and (
+                not self.ua.startswith("Mozilla/")
+                or (self.args.dav_ua1 and self.args.dav_ua1.search(self.ua))
+            )
         ):
             rc = 401
             self.out_headers["WWW-Authenticate"] = 'Basic realm="a"'
diff --git a/copyparty/svchub.py b/copyparty/svchub.py
index 3be52ce7..560355f2 100644
--- a/copyparty/svchub.py
+++ b/copyparty/svchub.py
@@ -769,7 +769,7 @@ class SvcHub(object):
                 vs = os.path.expandvars(os.path.expanduser(vs))
                 setattr(al, k, vs)
 
-        for k in "sus_urls nonsus_urls".split(" "):
+        for k in "dav_ua1 sus_urls nonsus_urls".split(" "):
             vs = getattr(al, k)
             if not vs or vs == "no":
                 setattr(al, k, None)