diff --git a/copyparty/httpcli.py b/copyparty/httpcli.py
index 5e317be6..142eee3d 100644
--- a/copyparty/httpcli.py
+++ b/copyparty/httpcli.py
@@ -1759,10 +1759,10 @@ class HttpCli(object):
             fdir = os.path.dirname(fn)
 
             if not bos.path.isdir(fdir):
-                raise Pebkac(500, "parent folder does not exist")
+                raise Pebkac(409, "parent folder does not exist")
 
             if bos.path.isdir(fn):
-                raise Pebkac(500, "that folder exists already")
+                raise Pebkac(405, "that folder exists already")
 
             try:
                 bos.mkdir(fn)
diff --git a/copyparty/util.py b/copyparty/util.py
index a0a4708f..7a65f6e5 100644
--- a/copyparty/util.py
+++ b/copyparty/util.py
@@ -162,6 +162,7 @@ HTTPCODE = {
     403: "Forbidden",
     404: "Not Found",
     405: "Method Not Allowed",
+    409: "Conflict",
     411: "Length Required",
     412: "Precondition Failed",
     413: "Payload Too Large",