From 06684cd254eb76b54d41b57dbc50a3420c901568 Mon Sep 17 00:00:00 2001
From: Yifei Kong <kong@yifei.me>
Date: Sun, 1 Oct 2023 16:31:02 +0800
Subject: [PATCH] Skip headers where value is None, mimics requests, fix #132

---
 curl_cffi/requests/headers.py  |  1 +
 tests/unittest/test_headers.py | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 tests/unittest/test_headers.py

diff --git a/curl_cffi/requests/headers.py b/curl_cffi/requests/headers.py
index 7ddb8284..e049714a 100644
--- a/curl_cffi/requests/headers.py
+++ b/curl_cffi/requests/headers.py
@@ -85,6 +85,7 @@ def __init__(
                     normalize_header_value(v, encoding),
                 )
                 for k, v in headers.items()
+                if v is not None
             ]
         else:
             if isinstance(headers[0], (str, bytes)):
diff --git a/tests/unittest/test_headers.py b/tests/unittest/test_headers.py
new file mode 100644
index 00000000..9dc4f1f8
--- /dev/null
+++ b/tests/unittest/test_headers.py
@@ -0,0 +1,17 @@
+from curl_cffi.requests import Headers
+
+
+def test_headers():
+    headers = Headers()
+    headers['foo'] = 'bar'
+    headers['foo'] = 'baz'
+    assert headers['foo'] == 'baz'
+    assert headers.get('foo') == 'baz'
+    assert headers.get('bar') is None
+    assert headers
+
+
+def test_headers_none_value():
+    headers = Headers({"foo": None, "bar": ""})
+    assert headers.get("foo") is None
+    assert headers["bar"] == ""