@@ -435,7 +435,7 @@ async def send_notification(
435435 raise MaxAttemptsExceeded
436436
437437 async def _create_proxy_connection (
438- self , apns_protocol_factory
438+ self , apns_protocol_factory
439439 ) -> APNsBaseClientProtocol :
440440 assert self .proxy_host is not None , "proxy_host must be set"
441441 assert self .proxy_port is not None , "proxy_port must be set"
@@ -454,8 +454,9 @@ async def _create_proxy_connection(
454454 )
455455 await protocol .apns_connection_ready .wait ()
456456
457- assert protocol .apns_protocol is not None , \
458- "protocol.apns_protocol could not be set"
457+ assert (
458+ protocol .apns_protocol is not None
459+ ), "protocol.apns_protocol could not be set"
459460 return protocol .apns_protocol
460461
461462
@@ -471,15 +472,14 @@ def __init__(
471472 ssl_context : Optional [ssl .SSLContext ] = None ,
472473 proxy_host : Optional [str ] = None ,
473474 proxy_port : Optional [int ] = None ,
474-
475475 ) -> None :
476476 super (APNsCertConnectionPool , self ).__init__ (
477477 topic = topic ,
478478 max_connections = max_connections ,
479479 max_connection_attempts = max_connection_attempts ,
480480 use_sandbox = use_sandbox ,
481481 proxy_host = proxy_host ,
482- proxy_port = proxy_port
482+ proxy_port = proxy_port ,
483483 )
484484
485485 self .cert_file = cert_file
@@ -542,7 +542,7 @@ def __init__(
542542 max_connection_attempts = max_connection_attempts ,
543543 use_sandbox = use_sandbox ,
544544 proxy_host = proxy_host ,
545- proxy_port = proxy_port
545+ proxy_port = proxy_port ,
546546 )
547547
548548 self .ssl_context = ssl_context or ssl .create_default_context ()
@@ -610,9 +610,11 @@ def connection_made(self, transport):
610610 "Proxy connection made." ,
611611 )
612612 self .transport = transport
613- connect_request = (f"CONNECT { self .apns_host } :{ self .apns_port } "
614- f"HTTP/1.1\r \n Host: "
615- f"{ self .apns_host } \r \n Connection: close\r \n \r \n " )
613+ connect_request = (
614+ f"CONNECT { self .apns_host } :{ self .apns_port } "
615+ f"HTTP/1.1\r \n Host: "
616+ f"{ self .apns_host } \r \n Connection: close\r \n \r \n "
617+ )
616618 self .transport .write (connect_request .encode ("utf-8" ))
617619
618620 def data_received (self , data ):
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