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dashboard/flask-server/venv/Lib/site-packages/waitress/compat.py

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+import platform
+
+# Fix for issue reported in https://github.com/Pylons/waitress/issues/138,
+# Python on Windows may not define IPPROTO_IPV6 in socket.
+import socket
+import sys
+import warnings
+
+# True if we are running on Windows
+WIN = platform.system() == "Windows"
+
+MAXINT = sys.maxsize
+HAS_IPV6 = socket.has_ipv6
+
+if hasattr(socket, "IPPROTO_IPV6") and hasattr(socket, "IPV6_V6ONLY"):
+    IPPROTO_IPV6 = socket.IPPROTO_IPV6
+    IPV6_V6ONLY = socket.IPV6_V6ONLY
+else:  # pragma: no cover
+    if WIN:
+        IPPROTO_IPV6 = 41
+        IPV6_V6ONLY = 27
+    else:
+        warnings.warn(
+            "OS does not support required IPv6 socket flags. This is requirement "
+            "for Waitress. Please open an issue at https://github.com/Pylons/waitress. "
+            "IPv6 support has been disabled.",
+            RuntimeWarning,
+        )
+        HAS_IPV6 = False