fix uvicorn compatibility (#139)

Changes:

The last version accidentally introduced a bug with uvicorn.
Uvicorn assumes the headers in scope being a list instead of an
iterator, which is actually an asgi spec violation.
But we work around by allowing the the contains check to succeed which
is required for uvicorn.

docs/en/docs/release-notes.md

@@ -5,6 +5,13 @@ hide:
 
 # Release Notes
 
+
+## 0.12.6
+
+### Fixed
+
+- Bug with uvicorn. It assumes the headers in scope being a list instead of an iterator.
+
 ## 0.12.5
 
 ### Added

lilya/__init__.py

@@ -1 +1 @@
-__version__ = "0.12.5"
+__version__ = "0.12.6"

lilya/datastructures.py

@@ -231,6 +231,13 @@ def __iter__(self) -> Generator[tuple[bytes, bytes], None, None]:
         """For compatibility with ASGI."""
         return self.encoded_multi_items()
 
+    def __contains__(self, item: Any) -> bool:
+        try:
+            return super().__contains__(item)
+        except TypeError:
+            # uvicorn compatibility
+            return any(kv == item for kv in self.encoded_multi_items())
+
     def get_encoded_multi_items(self) -> list[tuple[bytes, bytes]]:
         """
         Returns a list of values from the bytes encoded multi items for ASGI

tests/test_datastructures.py

@@ -303,6 +303,13 @@ async def test_upload_file_repr():
     assert repr(file) == "DataUpload(filename='file', size=4, headers=Header({}))"
 
 
+def test_header_in():
+    # required for uvicorn
+    multi = Header([(b"content-length", b"6"), (b"Connection", b"close")])
+    assert (b"Connection", b"close") in multi
+    assert (b"foo", b"close") not in multi
+
+
 @pytest.mark.anyio
 async def test_upload_file_repr_headers():
     stream = io.BytesIO(b"data")