second commit

env/lib/python3.11/site-packages/httpx/_transports/__init__.py

@@ -0,0 +1,15 @@
+from .asgi import *
+from .base import *
+from .default import *
+from .mock import *
+from .wsgi import *
+
+__all__ = [
+    "ASGITransport",
+    "AsyncBaseTransport",
+    "BaseTransport",
+    "AsyncHTTPTransport",
+    "HTTPTransport",
+    "MockTransport",
+    "WSGITransport",
+]

env/lib/python3.11/site-packages/httpx/_transports/asgi.py

@@ -0,0 +1,187 @@
+from __future__ import annotations
+
+import typing
+
+from .._models import Request, Response
+from .._types import AsyncByteStream
+from .base import AsyncBaseTransport
+
+if typing.TYPE_CHECKING:  # pragma: no cover
+    import asyncio
+
+    import trio
+
+    Event = typing.Union[asyncio.Event, trio.Event]
+
+
+_Message = typing.MutableMapping[str, typing.Any]
+_Receive = typing.Callable[[], typing.Awaitable[_Message]]
+_Send = typing.Callable[
+    [typing.MutableMapping[str, typing.Any]], typing.Awaitable[None]
+]
+_ASGIApp = typing.Callable[
+    [typing.MutableMapping[str, typing.Any], _Receive, _Send], typing.Awaitable[None]
+]
+
+__all__ = ["ASGITransport"]
+
+
+def is_running_trio() -> bool:
+    try:
+        # sniffio is a dependency of trio.
+
+        # See https://github.com/python-trio/trio/issues/2802
+        import sniffio
+
+        if sniffio.current_async_library() == "trio":
+            return True
+    except ImportError:  # pragma: nocover
+        pass
+
+    return False
+
+
+def create_event() -> Event:
+    if is_running_trio():
+        import trio
+
+        return trio.Event()
+
+    import asyncio
+
+    return asyncio.Event()
+
+
+class ASGIResponseStream(AsyncByteStream):
+    def __init__(self, body: list[bytes]) -> None:
+        self._body = body
+
+    async def __aiter__(self) -> typing.AsyncIterator[bytes]:
+        yield b"".join(self._body)
+
+
+class ASGITransport(AsyncBaseTransport):
+    """
+    A custom AsyncTransport that handles sending requests directly to an ASGI app.
+
+    ```python
+    transport = httpx.ASGITransport(
+        app=app,
+        root_path="/submount",
+        client=("1.2.3.4", 123)
+    )
+    client = httpx.AsyncClient(transport=transport)
+    ```
+
+    Arguments:
+
+    * `app` - The ASGI application.
+    * `raise_app_exceptions` - Boolean indicating if exceptions in the application
+       should be raised. Default to `True`. Can be set to `False` for use cases
+       such as testing the content of a client 500 response.
+    * `root_path` - The root path on which the ASGI application should be mounted.
+    * `client` - A two-tuple indicating the client IP and port of incoming requests.
+    ```
+    """
+
+    def __init__(
+        self,
+        app: _ASGIApp,
+        raise_app_exceptions: bool = True,
+        root_path: str = "",
+        client: tuple[str, int] = ("127.0.0.1", 123),
+    ) -> None:
+        self.app = app
+        self.raise_app_exceptions = raise_app_exceptions
+        self.root_path = root_path
+        self.client = client
+
+    async def handle_async_request(
+        self,
+        request: Request,
+    ) -> Response:
+        assert isinstance(request.stream, AsyncByteStream)
+
+        # ASGI scope.
+        scope = {
+            "type": "http",
+            "asgi": {"version": "3.0"},
+            "http_version": "1.1",
+            "method": request.method,
+            "headers": [(k.lower(), v) for (k, v) in request.headers.raw],
+            "scheme": request.url.scheme,
+            "path": request.url.path,
+            "raw_path": request.url.raw_path.split(b"?")[0],
+            "query_string": request.url.query,
+            "server": (request.url.host, request.url.port),
+            "client": self.client,
+            "root_path": self.root_path,
+        }
+
+        # Request.
+        request_body_chunks = request.stream.__aiter__()
+        request_complete = False
+
+        # Response.
+        status_code = None
+        response_headers = None
+        body_parts = []
+        response_started = False
+        response_complete = create_event()
+
+        # ASGI callables.
+
+        async def receive() -> dict[str, typing.Any]:
+            nonlocal request_complete
+
+            if request_complete:
+                await response_complete.wait()
+                return {"type": "http.disconnect"}
+
+            try:
+                body = await request_body_chunks.__anext__()
+            except StopAsyncIteration:
+                request_complete = True
+                return {"type": "http.request", "body": b"", "more_body": False}
+            return {"type": "http.request", "body": body, "more_body": True}
+
+        async def send(message: typing.MutableMapping[str, typing.Any]) -> None:
+            nonlocal status_code, response_headers, response_started
+
+            if message["type"] == "http.response.start":
+                assert not response_started
+
+                status_code = message["status"]
+                response_headers = message.get("headers", [])
+                response_started = True
+
+            elif message["type"] == "http.response.body":
+                assert not response_complete.is_set()
+                body = message.get("body", b"")
+                more_body = message.get("more_body", False)
+
+                if body and request.method != "HEAD":
+                    body_parts.append(body)
+
+                if not more_body:
+                    response_complete.set()
+
+        try:
+            await self.app(scope, receive, send)
+        except Exception:  # noqa: PIE-786
+            if self.raise_app_exceptions:
+                raise
+
+            response_complete.set()
+            if status_code is None:
+                status_code = 500
+            if response_headers is None:
+                response_headers = {}
+
+        assert response_complete.is_set()
+        assert status_code is not None
+        assert response_headers is not None
+
+        stream = ASGIResponseStream(body_parts)
+
+        return Response(status_code, headers=response_headers, stream=stream)

env/lib/python3.11/site-packages/httpx/_transports/base.py

@@ -0,0 +1,86 @@
+from __future__ import annotations
+
+import typing
+from types import TracebackType
+
+from .._models import Request, Response
+
+T = typing.TypeVar("T", bound="BaseTransport")
+A = typing.TypeVar("A", bound="AsyncBaseTransport")
+
+__all__ = ["AsyncBaseTransport", "BaseTransport"]
+
+
+class BaseTransport:
+    def __enter__(self: T) -> T:
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None = None,
+        exc_value: BaseException | None = None,
+        traceback: TracebackType | None = None,
+    ) -> None:
+        self.close()
+
+    def handle_request(self, request: Request) -> Response:
+        """
+        Send a single HTTP request and return a response.
+
+        Developers shouldn't typically ever need to call into this API directly,
+        since the Client class provides all the higher level user-facing API
+        niceties.
+
+        In order to properly release any network resources, the response
+        stream should *either* be consumed immediately, with a call to
+        `response.stream.read()`, or else the `handle_request` call should
+        be followed with a try/finally block to ensuring the stream is
+        always closed.
+
+        Example usage:
+
+            with httpx.HTTPTransport() as transport:
+                req = httpx.Request(
+                    method=b"GET",
+                    url=(b"https", b"www.example.com", 443, b"/"),
+                    headers=[(b"Host", b"www.example.com")],
+                )
+                resp = transport.handle_request(req)
+                body = resp.stream.read()
+                print(resp.status_code, resp.headers, body)
+
+
+        Takes a `Request` instance as the only argument.
+
+        Returns a `Response` instance.
+        """
+        raise NotImplementedError(
+            "The 'handle_request' method must be implemented."
+        )  # pragma: no cover
+
+    def close(self) -> None:
+        pass
+
+
+class AsyncBaseTransport:
+    async def __aenter__(self: A) -> A:
+        return self
+
+    async def __aexit__(
+        self,
+        exc_type: type[BaseException] | None = None,
+        exc_value: BaseException | None = None,
+        traceback: TracebackType | None = None,
+    ) -> None:
+        await self.aclose()
+
+    async def handle_async_request(
+        self,
+        request: Request,
+    ) -> Response:
+        raise NotImplementedError(
+            "The 'handle_async_request' method must be implemented."
+        )  # pragma: no cover
+
+    async def aclose(self) -> None:
+        pass

env/lib/python3.11/site-packages/httpx/_transports/default.py

@@ -0,0 +1,406 @@
+"""
+Custom transports, with nicely configured defaults.
+
+The following additional keyword arguments are currently supported by httpcore...
+
+* uds: str
+* local_address: str
+* retries: int
+
+Example usages...
+
+# Disable HTTP/2 on a single specific domain.
+mounts = {
+    "all://": httpx.HTTPTransport(http2=True),
+    "all://*example.org": httpx.HTTPTransport()
+}
+
+# Using advanced httpcore configuration, with connection retries.
+transport = httpx.HTTPTransport(retries=1)
+client = httpx.Client(transport=transport)
+
+# Using advanced httpcore configuration, with unix domain sockets.
+transport = httpx.HTTPTransport(uds="socket.uds")
+client = httpx.Client(transport=transport)
+"""
+
+from __future__ import annotations
+
+import contextlib
+import typing
+from types import TracebackType
+
+if typing.TYPE_CHECKING:
+    import ssl  # pragma: no cover
+
+    import httpx  # pragma: no cover
+
+from .._config import DEFAULT_LIMITS, Limits, Proxy, create_ssl_context
+from .._exceptions import (
+    ConnectError,
+    ConnectTimeout,
+    LocalProtocolError,
+    NetworkError,
+    PoolTimeout,
+    ProtocolError,
+    ProxyError,
+    ReadError,
+    ReadTimeout,
+    RemoteProtocolError,
+    TimeoutException,
+    UnsupportedProtocol,
+    WriteError,
+    WriteTimeout,
+)
+from .._models import Request, Response
+from .._types import AsyncByteStream, CertTypes, ProxyTypes, SyncByteStream
+from .._urls import URL
+from .base import AsyncBaseTransport, BaseTransport
+
+T = typing.TypeVar("T", bound="HTTPTransport")
+A = typing.TypeVar("A", bound="AsyncHTTPTransport")
+
+SOCKET_OPTION = typing.Union[
+    typing.Tuple[int, int, int],
+    typing.Tuple[int, int, typing.Union[bytes, bytearray]],
+    typing.Tuple[int, int, None, int],
+]
+
+__all__ = ["AsyncHTTPTransport", "HTTPTransport"]
+
+HTTPCORE_EXC_MAP: dict[type[Exception], type[httpx.HTTPError]] = {}
+
+
+def _load_httpcore_exceptions() -> dict[type[Exception], type[httpx.HTTPError]]:
+    import httpcore
+
+    return {
+        httpcore.TimeoutException: TimeoutException,
+        httpcore.ConnectTimeout: ConnectTimeout,
+        httpcore.ReadTimeout: ReadTimeout,
+        httpcore.WriteTimeout: WriteTimeout,
+        httpcore.PoolTimeout: PoolTimeout,
+        httpcore.NetworkError: NetworkError,
+        httpcore.ConnectError: ConnectError,
+        httpcore.ReadError: ReadError,
+        httpcore.WriteError: WriteError,
+        httpcore.ProxyError: ProxyError,
+        httpcore.UnsupportedProtocol: UnsupportedProtocol,
+        httpcore.ProtocolError: ProtocolError,
+        httpcore.LocalProtocolError: LocalProtocolError,
+        httpcore.RemoteProtocolError: RemoteProtocolError,
+    }
+
+
+@contextlib.contextmanager
+def map_httpcore_exceptions() -> typing.Iterator[None]:
+    global HTTPCORE_EXC_MAP
+    if len(HTTPCORE_EXC_MAP) == 0:
+        HTTPCORE_EXC_MAP = _load_httpcore_exceptions()
+    try:
+        yield
+    except Exception as exc:
+        mapped_exc = None
+
+        for from_exc, to_exc in HTTPCORE_EXC_MAP.items():
+            if not isinstance(exc, from_exc):
+                continue
+            # We want to map to the most specific exception we can find.
+            # Eg if `exc` is an `httpcore.ReadTimeout`, we want to map to
+            # `httpx.ReadTimeout`, not just `httpx.TimeoutException`.
+            if mapped_exc is None or issubclass(to_exc, mapped_exc):
+                mapped_exc = to_exc
+
+        if mapped_exc is None:  # pragma: no cover
+            raise
+
+        message = str(exc)
+        raise mapped_exc(message) from exc
+
+
+class ResponseStream(SyncByteStream):
+    def __init__(self, httpcore_stream: typing.Iterable[bytes]) -> None:
+        self._httpcore_stream = httpcore_stream
+
+    def __iter__(self) -> typing.Iterator[bytes]:
+        with map_httpcore_exceptions():
+            for part in self._httpcore_stream:
+                yield part
+
+    def close(self) -> None:
+        if hasattr(self._httpcore_stream, "close"):
+            self._httpcore_stream.close()
+
+
+class HTTPTransport(BaseTransport):
+    def __init__(
+        self,
+        verify: ssl.SSLContext | str | bool = True,
+        cert: CertTypes | None = None,
+        trust_env: bool = True,
+        http1: bool = True,
+        http2: bool = False,
+        limits: Limits = DEFAULT_LIMITS,
+        proxy: ProxyTypes | None = None,
+        uds: str | None = None,
+        local_address: str | None = None,
+        retries: int = 0,
+        socket_options: typing.Iterable[SOCKET_OPTION] | None = None,
+    ) -> None:
+        import httpcore
+
+        proxy = Proxy(url=proxy) if isinstance(proxy, (str, URL)) else proxy
+        ssl_context = create_ssl_context(verify=verify, cert=cert, trust_env=trust_env)
+
+        if proxy is None:
+            self._pool = httpcore.ConnectionPool(
+                ssl_context=ssl_context,
+                max_connections=limits.max_connections,
+                max_keepalive_connections=limits.max_keepalive_connections,
+                keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
+                http2=http2,
+                uds=uds,
+                local_address=local_address,
+                retries=retries,
+                socket_options=socket_options,
+            )
+        elif proxy.url.scheme in ("http", "https"):
+            self._pool = httpcore.HTTPProxy(
+                proxy_url=httpcore.URL(
+                    scheme=proxy.url.raw_scheme,
+                    host=proxy.url.raw_host,
+                    port=proxy.url.port,
+                    target=proxy.url.raw_path,
+                ),
+                proxy_auth=proxy.raw_auth,
+                proxy_headers=proxy.headers.raw,
+                ssl_context=ssl_context,
+                proxy_ssl_context=proxy.ssl_context,
+                max_connections=limits.max_connections,
+                max_keepalive_connections=limits.max_keepalive_connections,
+                keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
+                http2=http2,
+                socket_options=socket_options,
+            )
+        elif proxy.url.scheme in ("socks5", "socks5h"):
+            try:
+                import socksio  # noqa
+            except ImportError:  # pragma: no cover
+                raise ImportError(
+                    "Using SOCKS proxy, but the 'socksio' package is not installed. "
+                    "Make sure to install httpx using `pip install httpx[socks]`."
+                ) from None
+
+            self._pool = httpcore.SOCKSProxy(
+                proxy_url=httpcore.URL(
+                    scheme=proxy.url.raw_scheme,
+                    host=proxy.url.raw_host,
+                    port=proxy.url.port,
+                    target=proxy.url.raw_path,
+                ),
+                proxy_auth=proxy.raw_auth,
+                ssl_context=ssl_context,
+                max_connections=limits.max_connections,
+                max_keepalive_connections=limits.max_keepalive_connections,
+                keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
+                http2=http2,
+            )
+        else:  # pragma: no cover
+            raise ValueError(
+                "Proxy protocol must be either 'http', 'https', 'socks5', or 'socks5h',"
+                f" but got {proxy.url.scheme!r}."
+            )
+
+    def __enter__(self: T) -> T:  # Use generics for subclass support.
+        self._pool.__enter__()
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None = None,
+        exc_value: BaseException | None = None,
+        traceback: TracebackType | None = None,
+    ) -> None:
+        with map_httpcore_exceptions():
+            self._pool.__exit__(exc_type, exc_value, traceback)
+
+    def handle_request(
+        self,
+        request: Request,
+    ) -> Response:
+        assert isinstance(request.stream, SyncByteStream)
+        import httpcore
+
+        req = httpcore.Request(
+            method=request.method,
+            url=httpcore.URL(
+                scheme=request.url.raw_scheme,
+                host=request.url.raw_host,
+                port=request.url.port,
+                target=request.url.raw_path,
+            ),
+            headers=request.headers.raw,
+            content=request.stream,
+            extensions=request.extensions,
+        )
+        with map_httpcore_exceptions():
+            resp = self._pool.handle_request(req)
+
+        assert isinstance(resp.stream, typing.Iterable)
+
+        return Response(
+            status_code=resp.status,
+            headers=resp.headers,
+            stream=ResponseStream(resp.stream),
+            extensions=resp.extensions,
+        )
+
+    def close(self) -> None:
+        self._pool.close()
+
+
+class AsyncResponseStream(AsyncByteStream):
+    def __init__(self, httpcore_stream: typing.AsyncIterable[bytes]) -> None:
+        self._httpcore_stream = httpcore_stream
+
+    async def __aiter__(self) -> typing.AsyncIterator[bytes]:
+        with map_httpcore_exceptions():
+            async for part in self._httpcore_stream:
+                yield part
+
+    async def aclose(self) -> None:
+        if hasattr(self._httpcore_stream, "aclose"):
+            await self._httpcore_stream.aclose()
+
+
+class AsyncHTTPTransport(AsyncBaseTransport):
+    def __init__(
+        self,
+        verify: ssl.SSLContext | str | bool = True,
+        cert: CertTypes | None = None,
+        trust_env: bool = True,
+        http1: bool = True,
+        http2: bool = False,
+        limits: Limits = DEFAULT_LIMITS,
+        proxy: ProxyTypes | None = None,
+        uds: str | None = None,
+        local_address: str | None = None,
+        retries: int = 0,
+        socket_options: typing.Iterable[SOCKET_OPTION] | None = None,
+    ) -> None:
+        import httpcore
+
+        proxy = Proxy(url=proxy) if isinstance(proxy, (str, URL)) else proxy
+        ssl_context = create_ssl_context(verify=verify, cert=cert, trust_env=trust_env)
+
+        if proxy is None:
+            self._pool = httpcore.AsyncConnectionPool(
+                ssl_context=ssl_context,
+                max_connections=limits.max_connections,
+                max_keepalive_connections=limits.max_keepalive_connections,
+                keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
+                http2=http2,
+                uds=uds,
+                local_address=local_address,
+                retries=retries,
+                socket_options=socket_options,
+            )
+        elif proxy.url.scheme in ("http", "https"):
+            self._pool = httpcore.AsyncHTTPProxy(
+                proxy_url=httpcore.URL(
+                    scheme=proxy.url.raw_scheme,
+                    host=proxy.url.raw_host,
+                    port=proxy.url.port,
+                    target=proxy.url.raw_path,
+                ),
+                proxy_auth=proxy.raw_auth,
+                proxy_headers=proxy.headers.raw,
+                proxy_ssl_context=proxy.ssl_context,
+                ssl_context=ssl_context,
+                max_connections=limits.max_connections,
+                max_keepalive_connections=limits.max_keepalive_connections,
+                keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
+                http2=http2,
+                socket_options=socket_options,
+            )
+        elif proxy.url.scheme in ("socks5", "socks5h"):
+            try:
+                import socksio  # noqa
+            except ImportError:  # pragma: no cover
+                raise ImportError(
+                    "Using SOCKS proxy, but the 'socksio' package is not installed. "
+                    "Make sure to install httpx using `pip install httpx[socks]`."
+                ) from None
+
+            self._pool = httpcore.AsyncSOCKSProxy(
+                proxy_url=httpcore.URL(
+                    scheme=proxy.url.raw_scheme,
+                    host=proxy.url.raw_host,
+                    port=proxy.url.port,
+                    target=proxy.url.raw_path,
+                ),
+                proxy_auth=proxy.raw_auth,
+                ssl_context=ssl_context,
+                max_connections=limits.max_connections,
+                max_keepalive_connections=limits.max_keepalive_connections,
+                keepalive_expiry=limits.keepalive_expiry,
+                http1=http1,
+                http2=http2,
+            )
+        else:  # pragma: no cover
+            raise ValueError(
+                "Proxy protocol must be either 'http', 'https', 'socks5', or 'socks5h',"
+                " but got {proxy.url.scheme!r}."
+            )
+
+    async def __aenter__(self: A) -> A:  # Use generics for subclass support.
+        await self._pool.__aenter__()
+        return self
+
+    async def __aexit__(
+        self,
+        exc_type: type[BaseException] | None = None,
+        exc_value: BaseException | None = None,
+        traceback: TracebackType | None = None,
+    ) -> None:
+        with map_httpcore_exceptions():
+            await self._pool.__aexit__(exc_type, exc_value, traceback)
+
+    async def handle_async_request(
+        self,
+        request: Request,
+    ) -> Response:
+        assert isinstance(request.stream, AsyncByteStream)
+        import httpcore
+
+        req = httpcore.Request(
+            method=request.method,
+            url=httpcore.URL(
+                scheme=request.url.raw_scheme,
+                host=request.url.raw_host,
+                port=request.url.port,
+                target=request.url.raw_path,
+            ),
+            headers=request.headers.raw,
+            content=request.stream,
+            extensions=request.extensions,
+        )
+        with map_httpcore_exceptions():
+            resp = await self._pool.handle_async_request(req)
+
+        assert isinstance(resp.stream, typing.AsyncIterable)
+
+        return Response(
+            status_code=resp.status,
+            headers=resp.headers,
+            stream=AsyncResponseStream(resp.stream),
+            extensions=resp.extensions,
+        )
+
+    async def aclose(self) -> None:
+        await self._pool.aclose()

env/lib/python3.11/site-packages/httpx/_transports/mock.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+import typing
+
+from .._models import Request, Response
+from .base import AsyncBaseTransport, BaseTransport
+
+SyncHandler = typing.Callable[[Request], Response]
+AsyncHandler = typing.Callable[[Request], typing.Coroutine[None, None, Response]]
+
+
+__all__ = ["MockTransport"]
+
+
+class MockTransport(AsyncBaseTransport, BaseTransport):
+    def __init__(self, handler: SyncHandler | AsyncHandler) -> None:
+        self.handler = handler
+
+    def handle_request(
+        self,
+        request: Request,
+    ) -> Response:
+        request.read()
+        response = self.handler(request)
+        if not isinstance(response, Response):  # pragma: no cover
+            raise TypeError("Cannot use an async handler in a sync Client")
+        return response
+
+    async def handle_async_request(
+        self,
+        request: Request,
+    ) -> Response:
+        await request.aread()
+        response = self.handler(request)
+
+        # Allow handler to *optionally* be an `async` function.
+        # If it is, then the `response` variable need to be awaited to actually
+        # return the result.
+
+        if not isinstance(response, Response):
+            response = await response
+
+        return response

env/lib/python3.11/site-packages/httpx/_transports/wsgi.py

@@ -0,0 +1,149 @@
+from __future__ import annotations
+
+import io
+import itertools
+import sys
+import typing
+
+from .._models import Request, Response
+from .._types import SyncByteStream
+from .base import BaseTransport
+
+if typing.TYPE_CHECKING:
+    from _typeshed import OptExcInfo  # pragma: no cover
+    from _typeshed.wsgi import WSGIApplication  # pragma: no cover
+
+_T = typing.TypeVar("_T")
+
+
+__all__ = ["WSGITransport"]
+
+
+def _skip_leading_empty_chunks(body: typing.Iterable[_T]) -> typing.Iterable[_T]:
+    body = iter(body)
+    for chunk in body:
+        if chunk:
+            return itertools.chain([chunk], body)
+    return []
+
+
+class WSGIByteStream(SyncByteStream):
+    def __init__(self, result: typing.Iterable[bytes]) -> None:
+        self._close = getattr(result, "close", None)
+        self._result = _skip_leading_empty_chunks(result)
+
+    def __iter__(self) -> typing.Iterator[bytes]:
+        for part in self._result:
+            yield part
+
+    def close(self) -> None:
+        if self._close is not None:
+            self._close()
+
+
+class WSGITransport(BaseTransport):
+    """
+    A custom transport that handles sending requests directly to an WSGI app.
+    The simplest way to use this functionality is to use the `app` argument.
+
+    ```
+    client = httpx.Client(app=app)
+    ```
+
+    Alternatively, you can setup the transport instance explicitly.
+    This allows you to include any additional configuration arguments specific
+    to the WSGITransport class:
+
+    ```
+    transport = httpx.WSGITransport(
+        app=app,
+        script_name="/submount",
+        remote_addr="1.2.3.4"
+    )
+    client = httpx.Client(transport=transport)
+    ```
+
+    Arguments:
+
+    * `app` - The WSGI application.
+    * `raise_app_exceptions` - Boolean indicating if exceptions in the application
+       should be raised. Default to `True`. Can be set to `False` for use cases
+       such as testing the content of a client 500 response.
+    * `script_name` - The root path on which the WSGI application should be mounted.
+    * `remote_addr` - A string indicating the client IP of incoming requests.
+    ```
+    """
+
+    def __init__(
+        self,
+        app: WSGIApplication,
+        raise_app_exceptions: bool = True,
+        script_name: str = "",
+        remote_addr: str = "127.0.0.1",
+        wsgi_errors: typing.TextIO | None = None,
+    ) -> None:
+        self.app = app
+        self.raise_app_exceptions = raise_app_exceptions
+        self.script_name = script_name
+        self.remote_addr = remote_addr
+        self.wsgi_errors = wsgi_errors
+
+    def handle_request(self, request: Request) -> Response:
+        request.read()
+        wsgi_input = io.BytesIO(request.content)
+
+        port = request.url.port or {"http": 80, "https": 443}[request.url.scheme]
+        environ = {
+            "wsgi.version": (1, 0),
+            "wsgi.url_scheme": request.url.scheme,
+            "wsgi.input": wsgi_input,
+            "wsgi.errors": self.wsgi_errors or sys.stderr,
+            "wsgi.multithread": True,
+            "wsgi.multiprocess": False,
+            "wsgi.run_once": False,
+            "REQUEST_METHOD": request.method,
+            "SCRIPT_NAME": self.script_name,
+            "PATH_INFO": request.url.path,
+            "QUERY_STRING": request.url.query.decode("ascii"),
+            "SERVER_NAME": request.url.host,
+            "SERVER_PORT": str(port),
+            "SERVER_PROTOCOL": "HTTP/1.1",
+            "REMOTE_ADDR": self.remote_addr,
+        }
+        for header_key, header_value in request.headers.raw:
+            key = header_key.decode("ascii").upper().replace("-", "_")
+            if key not in ("CONTENT_TYPE", "CONTENT_LENGTH"):
+                key = "HTTP_" + key
+            environ[key] = header_value.decode("ascii")
+
+        seen_status = None
+        seen_response_headers = None
+        seen_exc_info = None
+
+        def start_response(
+            status: str,
+            response_headers: list[tuple[str, str]],
+            exc_info: OptExcInfo | None = None,
+        ) -> typing.Callable[[bytes], typing.Any]:
+            nonlocal seen_status, seen_response_headers, seen_exc_info
+            seen_status = status
+            seen_response_headers = response_headers
+            seen_exc_info = exc_info
+            return lambda _: None
+
+        result = self.app(environ, start_response)
+
+        stream = WSGIByteStream(result)
+
+        assert seen_status is not None
+        assert seen_response_headers is not None
+        if seen_exc_info and seen_exc_info[0] and self.raise_app_exceptions:
+            raise seen_exc_info[1]
+
+        status_code = int(seen_status.split()[0])
+        headers = [
+            (key.encode("ascii"), value.encode("ascii"))
+            for key, value in seen_response_headers
+        ]
+
+        return Response(status_code, headers=headers, stream=stream)