Return fastapi http exception to fron from langchain runnable

My backend is running langchain routes with certain runnables. I want to be able to return an http exception like “404 Not found” to the front end, but when I raise it with with raise HTTPException(status_code=404, detail="Item not found") a CancelledException is created and the frontend recieves “internal server error”. How can I pull this off?

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<code>ERROR: Exception in ASGI application
Traceback (most recent call last):
File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 269, in __call__
await wrap(partial(self.listen_for_disconnect, receive))
File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 258, in wrap
await func()
File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 215, in listen_for_disconnect
message = await receive()
File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 596, in receive
await self.message_event.wait()
File "/usr/lib/python3.10/asyncio/locks.py", line 214, in wait
await fut
asyncio.exceptions.CancelledError: Cancelled by cancel scope 7fba499a8490
During handling of the above exception, another exception occurred:
+ Exception Group Traceback (most recent call last):
| File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 435, in run_asgi
| result = await app( # type: ignore[func-returns-value]
| File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 78, in __call__
| return await self.app(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/applications.py", line 276, in __call__
| await super().__call__(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/applications.py", line 122, in __call__
| await self.middleware_stack(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 184, in __call__
| raise exc
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 162, in __call__
| await self.app(scope, receive, _send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/cors.py", line 91, in __call__
| await self.simple_response(scope, receive, send, request_headers=headers)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/cors.py", line 146, in simple_response
| await self.app(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 79, in __call__
| raise exc
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 68, in __call__
| await self.app(scope, receive, sender)
| File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 21, in __call__
| raise e
| File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
| await self.app(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 718, in __call__
| await route.handle(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 276, in handle
| await self.app(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 69, in app
| await response(scope, receive, send)
| File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 255, in __call__
| async with anyio.create_task_group() as task_group:
| File "/my-code-path/.venv/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 680, in __aexit__
| raise BaseExceptionGroup(
| exceptiongroup.ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 258, in wrap
| await func()
| File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 245, in stream_response
| async for data in self.body_iterator:
| File "/my-code-path/.venv/lib/python3.10/site-packages/langserve/api_handler.py", line 1121, in _stream
| async for chunk in self._runnable.astream(
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4745, in astream
| async for item in self.bound.astream(
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2898, in astream
| async for chunk in self.atransform(input_aiter(), config, **kwargs):
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2881, in atransform
| async for chunk in self._atransform_stream_with_config(
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 1972, in _atransform_stream_with_config
| chunk = cast(Output, await py_anext(iterator))
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2851, in _atransform
| async for output in final_pipeline:
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4178, in atransform
| async for output in self._atransform_stream_with_config(
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 1972, in _atransform_stream_with_config
| chunk = cast(Output, await py_anext(iterator))
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4147, in _atransform
| output = await acall_func_with_variable_args(
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4122, in f
| return await run_in_executor(config, func, *args, **kwargs)
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/config.py", line 547, in run_in_executor
| return await asyncio.get_running_loop().run_in_executor(
| File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
| result = self.fn(*self.args, **self.kwargs)
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4116, in func
| return call_func_with_variable_args(
| File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/config.py", line 380, in call_func_with_variable_args
| return func(input, **kwargs) # type: ignore[call-arg]
| File "/my-code-path/src/chains/forms/refine_chain.py", line 65, in get_refined_runnable_map
| raise HTTPException(status_code=404, detail="Item not found")
| fastapi.exceptions.HTTPException
+------------------------------------
</code>
<code>ERROR: Exception in ASGI application Traceback (most recent call last): File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 269, in __call__ await wrap(partial(self.listen_for_disconnect, receive)) File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 258, in wrap await func() File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 215, in listen_for_disconnect message = await receive() File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 596, in receive await self.message_event.wait() File "/usr/lib/python3.10/asyncio/locks.py", line 214, in wait await fut asyncio.exceptions.CancelledError: Cancelled by cancel scope 7fba499a8490 During handling of the above exception, another exception occurred: + Exception Group Traceback (most recent call last): | File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 435, in run_asgi | result = await app( # type: ignore[func-returns-value] | File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 78, in __call__ | return await self.app(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/applications.py", line 276, in __call__ | await super().__call__(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/applications.py", line 122, in __call__ | await self.middleware_stack(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 184, in __call__ | raise exc | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 162, in __call__ | await self.app(scope, receive, _send) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/cors.py", line 91, in __call__ | await self.simple_response(scope, receive, send, request_headers=headers) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/cors.py", line 146, in simple_response | await self.app(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 79, in __call__ | raise exc | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 68, in __call__ | await self.app(scope, receive, sender) | File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 21, in __call__ | raise e | File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__ | await self.app(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 718, in __call__ | await route.handle(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 276, in handle | await self.app(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 69, in app | await response(scope, receive, send) | File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 255, in __call__ | async with anyio.create_task_group() as task_group: | File "/my-code-path/.venv/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 680, in __aexit__ | raise BaseExceptionGroup( | exceptiongroup.ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception) +-+---------------- 1 ---------------- | Traceback (most recent call last): | File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 258, in wrap | await func() | File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 245, in stream_response | async for data in self.body_iterator: | File "/my-code-path/.venv/lib/python3.10/site-packages/langserve/api_handler.py", line 1121, in _stream | async for chunk in self._runnable.astream( | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4745, in astream | async for item in self.bound.astream( | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2898, in astream | async for chunk in self.atransform(input_aiter(), config, **kwargs): | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2881, in atransform | async for chunk in self._atransform_stream_with_config( | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 1972, in _atransform_stream_with_config | chunk = cast(Output, await py_anext(iterator)) | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2851, in _atransform | async for output in final_pipeline: | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4178, in atransform | async for output in self._atransform_stream_with_config( | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 1972, in _atransform_stream_with_config | chunk = cast(Output, await py_anext(iterator)) | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4147, in _atransform | output = await acall_func_with_variable_args( | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4122, in f | return await run_in_executor(config, func, *args, **kwargs) | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/config.py", line 547, in run_in_executor | return await asyncio.get_running_loop().run_in_executor( | File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run | result = self.fn(*self.args, **self.kwargs) | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4116, in func | return call_func_with_variable_args( | File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/config.py", line 380, in call_func_with_variable_args | return func(input, **kwargs) # type: ignore[call-arg] | File "/my-code-path/src/chains/forms/refine_chain.py", line 65, in get_refined_runnable_map | raise HTTPException(status_code=404, detail="Item not found") | fastapi.exceptions.HTTPException +------------------------------------ </code>
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 269, in __call__
    await wrap(partial(self.listen_for_disconnect, receive))
  File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 258, in wrap
    await func()
  File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 215, in listen_for_disconnect
    message = await receive()
  File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 596, in receive
    await self.message_event.wait()
  File "/usr/lib/python3.10/asyncio/locks.py", line 214, in wait
    await fut
asyncio.exceptions.CancelledError: Cancelled by cancel scope 7fba499a8490

During handling of the above exception, another exception occurred:

  + Exception Group Traceback (most recent call last):
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 435, in run_asgi
  |     result = await app(  # type: ignore[func-returns-value]
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 78, in __call__
  |     return await self.app(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/applications.py", line 276, in __call__
  |     await super().__call__(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/applications.py", line 122, in __call__
  |     await self.middleware_stack(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 184, in __call__
  |     raise exc
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/errors.py", line 162, in __call__
  |     await self.app(scope, receive, _send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/cors.py", line 91, in __call__
  |     await self.simple_response(scope, receive, send, request_headers=headers)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/cors.py", line 146, in simple_response
  |     await self.app(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 79, in __call__
  |     raise exc
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 68, in __call__
  |     await self.app(scope, receive, sender)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 21, in __call__
  |     raise e
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
  |     await self.app(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 718, in __call__
  |     await route.handle(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 276, in handle
  |     await self.app(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/starlette/routing.py", line 69, in app
  |     await response(scope, receive, send)
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 255, in __call__
  |     async with anyio.create_task_group() as task_group:
  |   File "/my-code-path/.venv/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 680, in __aexit__
  |     raise BaseExceptionGroup(
  | exceptiongroup.ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
  +-+---------------- 1 ----------------
    | Traceback (most recent call last):
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 258, in wrap
    |     await func()
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/sse_starlette/sse.py", line 245, in stream_response
    |     async for data in self.body_iterator:
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langserve/api_handler.py", line 1121, in _stream
    |     async for chunk in self._runnable.astream(
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4745, in astream
    |     async for item in self.bound.astream(
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2898, in astream
    |     async for chunk in self.atransform(input_aiter(), config, **kwargs):
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2881, in atransform
    |     async for chunk in self._atransform_stream_with_config(
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 1972, in _atransform_stream_with_config
    |     chunk = cast(Output, await py_anext(iterator))
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 2851, in _atransform
    |     async for output in final_pipeline:
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4178, in atransform
    |     async for output in self._atransform_stream_with_config(
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 1972, in _atransform_stream_with_config
    |     chunk = cast(Output, await py_anext(iterator))
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4147, in _atransform
    |     output = await acall_func_with_variable_args(
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4122, in f
    |     return await run_in_executor(config, func, *args, **kwargs)
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/config.py", line 547, in run_in_executor
    |     return await asyncio.get_running_loop().run_in_executor(
    |   File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    |     result = self.fn(*self.args, **self.kwargs)
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/base.py", line 4116, in func
    |     return call_func_with_variable_args(
    |   File "/my-code-path/.venv/lib/python3.10/site-packages/langchain_core/runnables/config.py", line 380, in call_func_with_variable_args
    |     return func(input, **kwargs)  # type: ignore[call-arg]
    |   File "/my-code-path/src/chains/forms/refine_chain.py", line 65, in get_refined_runnable_map
    |     raise HTTPException(status_code=404, detail="Item not found")
    | fastapi.exceptions.HTTPException
    +------------------------------------

I tried searching for a way to somehow catch that exception but the runnable is directly inserted into the “add_routes” function so I can’t figure out how to do it, since any exception inside the runnable raises the “CancelledException”.

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EnlighterJS 3 Syntax Highlighter
<code>refine_chain = RefineChain(custom_app, tool_name)
add_routes(
app,
refine_chain.get_runnable().with_config({"tags": [custom_app]}),
enabled_endpoints=["stream"],
path=f"/{custom_app}/{tool_name}/refine",
config_keys=["configurable"],
dependencies=[Depends(get_current_active_username)],
)
</code>
<code>refine_chain = RefineChain(custom_app, tool_name) add_routes( app, refine_chain.get_runnable().with_config({"tags": [custom_app]}), enabled_endpoints=["stream"], path=f"/{custom_app}/{tool_name}/refine", config_keys=["configurable"], dependencies=[Depends(get_current_active_username)], ) </code>
refine_chain = RefineChain(custom_app, tool_name)
add_routes(
  app,
  refine_chain.get_runnable().with_config({"tags": [custom_app]}),
  enabled_endpoints=["stream"],
  path=f"/{custom_app}/{tool_name}/refine",
  config_keys=["configurable"],
  dependencies=[Depends(get_current_active_username)],
)   

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Trang chủ Giới thiệu Sinh nhật bé trai Sinh nhật bé gái Tổ chức sự kiện Biểu diễn giải trí Dịch vụ khác Trang trí tiệc cưới Tổ chức khai trương Tư vấn dịch vụ Thư viện ảnh Tin tức - sự kiện Liên hệ Chú hề sinh nhật Trang trí YEAR END PARTY công ty Trang trí tất niên cuối năm Trang trí tất niên xu hướng mới nhất Trang trí sinh nhật bé trai Hải Đăng Trang trí sinh nhật bé Khánh Vân Trang trí sinh nhật Bích Ngân Trang trí sinh nhật bé Thanh Trang Thuê ông già Noel phát quà Biểu diễn xiếc khỉ Xiếc quay đĩa
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