--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/urllib3/_base_connection.py	Sun May 05 23:32:17 2024 -0400
@@ -0,0 +1,172 @@
+from __future__ import annotations
+
+import typing
+
+from .util.connection import _TYPE_SOCKET_OPTIONS
+from .util.timeout import _DEFAULT_TIMEOUT, _TYPE_TIMEOUT
+from .util.url import Url
+
+_TYPE_BODY = typing.Union[bytes, typing.IO[typing.Any], typing.Iterable[bytes], str]
+
+
+class ProxyConfig(typing.NamedTuple):
+    ssl_context: ssl.SSLContext | None
+    use_forwarding_for_https: bool
+    assert_hostname: None | str | Literal[False]
+    assert_fingerprint: str | None
+
+
+class _ResponseOptions(typing.NamedTuple):
+    # TODO: Remove this in favor of a better
+    # HTTP request/response lifecycle tracking.
+    request_method: str
+    request_url: str
+    preload_content: bool
+    decode_content: bool
+    enforce_content_length: bool
+
+
+if typing.TYPE_CHECKING:
+    import ssl
+    from typing import Literal, Protocol
+
+    from .response import BaseHTTPResponse
+
+    class BaseHTTPConnection(Protocol):
+        default_port: typing.ClassVar[int]
+        default_socket_options: typing.ClassVar[_TYPE_SOCKET_OPTIONS]
+
+        host: str
+        port: int
+        timeout: None | (
+            float
+        )  # Instance doesn't store _DEFAULT_TIMEOUT, must be resolved.
+        blocksize: int
+        source_address: tuple[str, int] | None
+        socket_options: _TYPE_SOCKET_OPTIONS | None
+
+        proxy: Url | None
+        proxy_config: ProxyConfig | None
+
+        is_verified: bool
+        proxy_is_verified: bool | None
+
+        def __init__(
+            self,
+            host: str,
+            port: int | None = None,
+            *,
+            timeout: _TYPE_TIMEOUT = _DEFAULT_TIMEOUT,
+            source_address: tuple[str, int] | None = None,
+            blocksize: int = 8192,
+            socket_options: _TYPE_SOCKET_OPTIONS | None = ...,
+            proxy: Url | None = None,
+            proxy_config: ProxyConfig | None = None,
+        ) -> None:
+            ...
+
+        def set_tunnel(
+            self,
+            host: str,
+            port: int | None = None,
+            headers: typing.Mapping[str, str] | None = None,
+            scheme: str = "http",
+        ) -> None:
+            ...
+
+        def connect(self) -> None:
+            ...
+
+        def request(
+            self,
+            method: str,
+            url: str,
+            body: _TYPE_BODY | None = None,
+            headers: typing.Mapping[str, str] | None = None,
+            # We know *at least* botocore is depending on the order of the
+            # first 3 parameters so to be safe we only mark the later ones
+            # as keyword-only to ensure we have space to extend.
+            *,
+            chunked: bool = False,
+            preload_content: bool = True,
+            decode_content: bool = True,
+            enforce_content_length: bool = True,
+        ) -> None:
+            ...
+
+        def getresponse(self) -> BaseHTTPResponse:
+            ...
+
+        def close(self) -> None:
+            ...
+
+        @property
+        def is_closed(self) -> bool:
+            """Whether the connection either is brand new or has been previously closed.
+            If this property is True then both ``is_connected`` and ``has_connected_to_proxy``
+            properties must be False.
+            """
+
+        @property
+        def is_connected(self) -> bool:
+            """Whether the connection is actively connected to any origin (proxy or target)"""
+
+        @property
+        def has_connected_to_proxy(self) -> bool:
+            """Whether the connection has successfully connected to its proxy.
+            This returns False if no proxy is in use. Used to determine whether
+            errors are coming from the proxy layer or from tunnelling to the target origin.
+            """
+
+    class BaseHTTPSConnection(BaseHTTPConnection, Protocol):
+        default_port: typing.ClassVar[int]
+        default_socket_options: typing.ClassVar[_TYPE_SOCKET_OPTIONS]
+
+        # Certificate verification methods
+        cert_reqs: int | str | None
+        assert_hostname: None | str | Literal[False]
+        assert_fingerprint: str | None
+        ssl_context: ssl.SSLContext | None
+
+        # Trusted CAs
+        ca_certs: str | None
+        ca_cert_dir: str | None
+        ca_cert_data: None | str | bytes
+
+        # TLS version
+        ssl_minimum_version: int | None
+        ssl_maximum_version: int | None
+        ssl_version: int | str | None  # Deprecated
+
+        # Client certificates
+        cert_file: str | None
+        key_file: str | None
+        key_password: str | None
+
+        def __init__(
+            self,
+            host: str,
+            port: int | None = None,
+            *,
+            timeout: _TYPE_TIMEOUT = _DEFAULT_TIMEOUT,
+            source_address: tuple[str, int] | None = None,
+            blocksize: int = 16384,
+            socket_options: _TYPE_SOCKET_OPTIONS | None = ...,
+            proxy: Url | None = None,
+            proxy_config: ProxyConfig | None = None,
+            cert_reqs: int | str | None = None,
+            assert_hostname: None | str | Literal[False] = None,
+            assert_fingerprint: str | None = None,
+            server_hostname: str | None = None,
+            ssl_context: ssl.SSLContext | None = None,
+            ca_certs: str | None = None,
+            ca_cert_dir: str | None = None,
+            ca_cert_data: None | str | bytes = None,
+            ssl_minimum_version: int | None = None,
+            ssl_maximum_version: int | None = None,
+            ssl_version: int | str | None = None,  # Deprecated
+            cert_file: str | None = None,
+            key_file: str | None = None,
+            key_password: str | None = None,
+        ) -> None:
+            ...