Update __init__.py to prevent changes to caller's headers dict

Need to take a local copy of any headers passed in to requests() otherwise the caller's list gets incorrectly extended or modified.

Signed-off-by: Andrew Gadsby <andrew@gadsby.me.uk>

Author: agadsby

python-ecosys/requests/requests/__init__.py

@@ -46,6 +46,8 @@ def request(
 ):
     if headers is None:
         headers = {}
+    else:
+        headers = headers.copy()    # local copy so we don't extend caller's
 
     redirect = None  # redirection url, None means no redirection
     chunked_data = data and getattr(data, "__next__", None) and not getattr(data, "__len__", None)