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flet-dev / flet

Flet enables developers to easily build realtime web, mobile and desktop apps in Python. No frontend experience required.
https://flet.dev
Apache License 2.0
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Running Flet app on web browser fails (on Arch linux) #3526

Open AbdouSadou opened 4 months ago

AbdouSadou commented 4 months ago

Duplicate Check

Describe the bug

Running simple Flet app with parameter view=ft.AppView.WEB_BROWSER throws an error. The webpage opens on localhost (1270.0.0.1:58009) with an Internal Server Error.

Running the app as normal (desktop) without the parameter works fine.

Code

import flet as ft

def main(page: ft.Page):
    page.add(ft.SafeArea(ft.Text("Hello, Flet!")))

ft.app(target=main, view=ft.AppView.WEB_BROWSER)

To reproduce

Just run provided sample code

Expected behavior

Opens a webpage on default browser, displaying "Hello flet".

Screenshots

Error thrown on run:

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 411, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 69, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/applications.py", line 123, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 65, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 756, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 776, in app
    await route.handle(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 485, in handle
    await self.app(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/applications.py", line 123, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 65, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 756, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 776, in app
    await route.handle(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 485, in handle
    await self.app(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/flet/fastapi/flet_static_files.py", line 83, in __call__
    await self.__once.do(self.__config, scope["root_path"])
  File "/usr/lib/python3.12/site-packages/flet_runtime/utils/once.py", line 13, in do
    await func(*args, **kwargs)
  File "/usr/lib/python3.12/site-packages/flet/fastapi/flet_static_files.py", line 120, in __config
    raise Exception(f"Web root path not found: {web_dir}")
Exception: Web root path not found: /usr/lib/python3.12/site-packages/flet/web
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 411, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 69, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/applications.py", line 123, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 65, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 756, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 776, in app
    await route.handle(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 485, in handle
    await self.app(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/applications.py", line 123, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 186, in __call__
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/usr/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 65, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 64, in wrapped_app
    raise exc
  File "/usr/lib/python3.12/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 756, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 776, in app
    await route.handle(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/starlette/routing.py", line 485, in handle
    await self.app(scope, receive, send)
  File "/usr/lib/python3.12/site-packages/flet/fastapi/flet_static_files.py", line 83, in __call__
    await self.__once.do(self.__config, scope["root_path"])
  File "/usr/lib/python3.12/site-packages/flet_runtime/utils/once.py", line 13, in do
    await func(*args, **kwargs)
  File "/usr/lib/python3.12/site-packages/flet/fastapi/flet_static_files.py", line 120, in __config
    raise Exception(f"Web root path not found: {web_dir}")
Exception: Web root path not found: /usr/lib/python3.12/site-packages/flet/web

The webpage opens on localhost (1270.0.0.1:58009) with an Internal Server Error image

Operating System

Linux

Operating system details

EndeavourOS (on kernel 6.9.6-arch1-1)

Flet version

python-flet 0.23.1-1

Regression

I'm not sure / I don't know

Suggestions

No response

Additional details

No response

mriscoc commented 1 day ago

I had similar error in a web deployment test on Windows 11:

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "uvicorn\protocols\http\httptools_impl.py", line 401, in run_asgi
...
...
 File "flet\fastapi\flet_static_files.py", line 120, in __config
Exception: Web root path not found: W:\Python\CaptureUI\dist\Capture\_internal\flet\web
ndonkoHenri commented 1 day ago

What is the output of running the below command:

printenv | grep FLET
mriscoc commented 1 day ago

What is the output of running the below command:

image

AbdouSadou commented 17 hours ago

What is the output of running the below command:

@ndonkoHenri Empty output. Should I set an env variable for flet ? image