fix: Swap out custom NO_PROXY handling for urllib.request.proxy_bypass

src/prefect/events/clients.py

@@ -16,6 +16,7 @@
     cast,
 )
 from urllib.parse import urlparse
+from urllib.request import proxy_bypass
 from uuid import UUID
 
 import orjson
@@ -84,20 +85,6 @@ def events_out_socket_from_api_url(url: str):
     return http_to_ws(url) + "/events/out"
 
 
-def _host_matches_no_proxy(host: str) -> bool:
-    """Checks whether a given host matches NO_PROXY configuration.
-    NO_PROXY entries with a leading dot are treated as domain suffixes, while all others are treated as exact matches.
-    """
-    if no_proxy := os.environ.get("NO_PROXY"):
-        for no_proxy_host in no_proxy.split(","):
-            if no_proxy_host.startswith("."):
-                if host.endswith(no_proxy_host):
-                    return True
-            elif no_proxy_host == host:
-                return True
-    return False
-
-
 class WebsocketProxyConnect(Connect):
     def __init__(self: Self, uri: str, **kwargs: Any):
         # super() is intentionally deferred to the _proxy_connect method
@@ -125,9 +112,7 @@ def __init__(self: Self, uri: str, **kwargs: Any):
             )
 
         self._proxy = (
-            Proxy.from_url(proxy_url)
-            if proxy_url and not _host_matches_no_proxy(host)
-            else None
+            Proxy.from_url(proxy_url) if proxy_url and not proxy_bypass(host) else None
         )
         self._host = host
         self._port = port