Add missing key_server_hostname variable
Allow key_server_hostname to be specified when initializing a PoolManager to allow custom SNI to be overridden.
@@ -47,6 +47,7 @@ _key_fields = (
'key__socks_options', # dict
'key_assert_hostname', # bool or string
'key_assert_fingerprint', # str
+ 'key_server_hostname', #str
)
#: The namedtuple class used to construct keys for the connection pool.
