Remove .encode("ascii") call from null byte (#1037)

diff --git a/httpx/_utils.py b/httpx/_utils.py
index 89ded267b23ee52f3734cd2628692a5b641711cc..e38a662a2f7448a9d955fa0d81275c3096b84cf0 100644 (file)
--- a/httpx/_utils.py
+++ b/httpx/_utils.py
@@ -94,7 +94,7 @@ def format_form_param(name: str, value: typing.Union[str, bytes]) -> bytes:
 
 
 # Null bytes; no need to recreate these on each call to guess_json_utf
-_null = "\x00".encode("ascii")  # encoding to ASCII for Python 3
+_null = b"\x00"
 _null2 = _null * 2
 _null3 = _null * 3