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Idea: Pass a copy of the scope to the ASGI app to prevent headers changing to something incompatible #2573

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Idea: Pass a copy of the scope to the ASGI app to prevent headers changing to something incompatible #2573

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8 changes: 7 additions & 1 deletion uvicorn/protocols/http/h11_impl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -400,8 +400,14 @@ def __init__(
# ASGI exception wrapper
async def run_asgi(self, app: ASGI3Application) -> None:
try:
# asgi apps can manipulate the scope, make sure we don't get a manipulated scope
# this can lead to problems when e.g. the headers are exchanged by an iterator
result = await app( # type: ignore[func-returns-value]
self.scope, self.receive, self.send
# asgi apps can manipulate the scope, make sure we don't get a manipulated scope
# this can lead to problems when e.g. the headers are exchanged by an iterator
self.scope.copy(),
self.receive,
self.send,
)
except BaseException as exc:
msg = "Exception in ASGI application\n"
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2 changes: 1 addition & 1 deletion uvicorn/protocols/http/httptools_impl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -407,7 +407,7 @@ def __init__(
async def run_asgi(self, app: ASGI3Application) -> None:
try:
result = await app( # type: ignore[func-returns-value]
self.scope, self.receive, self.send
self.scope.copy(), self.receive, self.send
)
except BaseException as exc:
msg = "Exception in ASGI application\n"
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