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fix: Update invocation metadata from grpc.aio.ServicerContext to use the correct syntax #635

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fix: Update invocation metadata from grpc.aio.ServicerContext to use the correct syntax #635

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73bd270
Update invocation metadata from grpc.aio.ServicerContext to use the c…
Jan 20, 2026
674084a
Update src/a2a/server/request_handlers/grpc_handler.py
jubonni Jan 20, 2026
f1e5d0a
Remove unused import
Jan 20, 2026
13df325
Ran ruff
Jan 21, 2026
bedc429
Merge branch 'main' into fix/grpc-request-headers
holtskinner Jan 21, 2026
393a194
Merge branch 'main' into fix/grpc-request-headers
holtskinner Jan 22, 2026
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14 changes: 6 additions & 8 deletions src/a2a/server/request_handlers/grpc_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
import logging

from abc import ABC, abstractmethod
from collections.abc import AsyncIterable, Sequence
from collections.abc import AsyncIterable


try:
Expand Down Expand Up @@ -53,13 +53,11 @@ def build(self, context: grpc.aio.ServicerContext) -> ServerCallContext:
def _get_metadata_value(
context: grpc.aio.ServicerContext, key: str
) -> list[str]:
md = context.invocation_metadata
raw_values: list[str | bytes] = []
if isinstance(md, Metadata):
raw_values = md.get_all(key)
elif isinstance(md, Sequence):
lower_key = key.lower()
raw_values = [e for (k, e) in md if k.lower() == lower_key]
md = context.invocation_metadata()
raw_values: list[str | bytes] = (
md.get_all(key) if isinstance(md, Metadata) else []
)

return [e if isinstance(e, str) else e.decode('utf-8') for e in raw_values]


Expand Down
6 changes: 3 additions & 3 deletions tests/server/request_handlers/test_grpc_handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -321,7 +321,7 @@ async def test_send_message_with_extensions(
mock_request_handler: AsyncMock,
mock_grpc_context: AsyncMock,
) -> None:
mock_grpc_context.invocation_metadata = grpc.aio.Metadata(
mock_grpc_context.invocation_metadata.return_value = grpc.aio.Metadata(
(HTTP_EXTENSION_HEADER, 'foo'),
(HTTP_EXTENSION_HEADER, 'bar'),
)
Expand Down Expand Up @@ -361,7 +361,7 @@ async def test_send_message_with_comma_separated_extensions(
mock_request_handler: AsyncMock,
mock_grpc_context: AsyncMock,
) -> None:
mock_grpc_context.invocation_metadata = grpc.aio.Metadata(
mock_grpc_context.invocation_metadata.return_value = grpc.aio.Metadata(
(HTTP_EXTENSION_HEADER, 'foo ,, bar,'),
(HTTP_EXTENSION_HEADER, 'baz , bar'),
)
Expand All @@ -386,7 +386,7 @@ async def test_send_streaming_message_with_extensions(
mock_request_handler: AsyncMock,
mock_grpc_context: AsyncMock,
) -> None:
mock_grpc_context.invocation_metadata = grpc.aio.Metadata(
mock_grpc_context.invocation_metadata.return_value = grpc.aio.Metadata(
(HTTP_EXTENSION_HEADER, 'foo'),
(HTTP_EXTENSION_HEADER, 'bar'),
)
Expand Down
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