fix mitmproxy#4021 (mitmproxy#4179)

snemes · Aug 27, 2020 · 8e5e43d · 8e5e43d
1 parent 72dd567
commit 8e5e43d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/mitmproxy/utils/typecheck.py b/mitmproxy/utils/typecheck.py
@@ -39,7 +39,7 @@ def check_option_type(name: str, value: typing.Any, typeinfo: Type) -> None:
 
     typename = str(typeinfo)
 
-    if typename.startswith("typing.Union"):
+    if typename.startswith("typing.Union") or typename.startswith("typing.Optional"):
         for T in union_types(typeinfo):
             try:
                 check_option_type(name, value, T)