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.venv/lib/python3.9/site-packages/hpack/struct.py

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+# -*- coding: utf-8 -*-
+"""
+hpack/struct
+~~~~~~~~~~~~
+
+Contains structures for representing header fields with associated metadata.
+"""
+
+
+class HeaderTuple(tuple):
+    """
+    A data structure that stores a single header field.
+
+    HTTP headers can be thought of as tuples of ``(field name, field value)``.
+    A single header block is a sequence of such tuples.
+
+    In HTTP/2, however, certain bits of additional information are required for
+    compressing these headers: in particular, whether the header field can be
+    safely added to the HPACK compression context.
+
+    This class stores a header that can be added to the compression context. In
+    all other ways it behaves exactly like a tuple.
+    """
+    __slots__ = ()
+
+    indexable = True
+
+    def __new__(cls, *args):
+        return tuple.__new__(cls, args)
+
+
+class NeverIndexedHeaderTuple(HeaderTuple):
+    """
+    A data structure that stores a single header field that cannot be added to
+    a HTTP/2 header compression context.
+    """
+    __slots__ = ()
+
+    indexable = False