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Fix web apps failing to start with FastAPI 0.145+ and prepare 1.0.5 - #6988
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FastAPI 0.145 removed the deprecated `openapi_prefix` argument, which the `flet_web.fastapi.FastAPI` wrapper always forwarded, so `flet run --web`, the web browser view and FastAPI-hosted apps raised a `TypeError` on startup. The wrapper now maps `openapi_prefix` onto `root_path`, as FastAPI itself did before removing it (#6984). Backport of the `flet_fastapi.py` change from 77eace0 on flet-1.1.0. Bump the flet package to 1.0.5.
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FeodorFitsner
approved these changes
Oct 21, 2026
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Fixes #6984.
FastAPI 0.145 (fastapi/fastapi#16518) removed the deprecated
openapi_prefixargument.flet_web.fastapi.FastAPIre-declares FastAPI's constructor signature and forwardedopenapi_prefix=""unconditionally, so on any fresh install with 1.0.4flet run --web, the web browser view and FastAPI-hosted apps crash on startup with:Fix
Backport of the
flet_fastapi.pychange from 77eace0 onflet-1.1.0: the wrapper mapsopenapi_prefixontoroot_path(root_path or openapi_prefix), which is exactly what FastAPI ≤0.144 did internally, so existing callers see no behavior change. The Python 3.15 changes from the same commit are left on 1.1.0.test_fastapi.pyfrom that commit is included too: it checks theroot_path/openapi_prefixprecedence and thaton_startup/on_shutdownrun through the custom lifespan. Since CI resolves dependencies fresh, it runs against the latest FastAPI.TypeError)TypeError)Release prep
packages/flet/pubspec.yaml→ 1.0.5, and thefletentry inclient/pubspec.lock(only that line; no other lock changes).## 1.0.5sections inCHANGELOG.mdandpackages/flet/CHANGELOG.md.After merge, tagging
v1.0.5onmainreleases it.Summary by Sourcery
Restore Flet web application startup compatibility with current FastAPI releases and prepare version 1.0.5.
Bug Fixes:
openapi_prefixargument.Enhancements:
root_pathprecedence while maintaining legacyopenapi_prefixbehavior in the Flet FastAPI wrapper.Tests:
Chores: