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Gracefully handle connection closed errors during streaming #16294

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Nov 6, 2025
Merged

Gracefully handle connection closed errors during streaming #16294

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9 changes: 9 additions & 0 deletions litellm/llms/custom_httpx/aiohttp_transport.py
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,15 @@ async def __aiter__(self) -> typing.AsyncIterator[bytes]:
# If the error is due to incomplete transfer encoding, we can still
# return what we've received so far, similar to how httpx handles it
return
except RuntimeError as e:
# Some providers (e.g., SSE streams) may close the connection
# causing aiohttp StreamReader to raise a generic RuntimeError
# with message "Connection closed.". Treat this as a graceful
# end-of-stream so downstream consumers don't error.
if "Connection closed" in str(e):
verbose_logger.debug("Upstream closed streaming connection; ending iterator gracefully")
return
raise
except aiohttp.http_exceptions.TransferEncodingError as e:
# Handle transfer encoding errors gracefully
verbose_logger.debug(f"Transfer encoding error, but continuing: {e}")
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