fastapi mount endpoint 404 #391

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BUG Description

A clear and concise description of what the bug is and how to reproduce it.

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Environment Information

• OS and Version:
• Browser and Version:
• Python Version: Use python3 --version to view
• PyWebIO Version: Use python3 -c "import pywebio;print(pywebio.__version__)" to view

main.py

@config(theme="minty", title=SEO_TITLE, description=SEO_DESCRIPTION)
def index() -> None:
app.mount("/", FastAPI(routes=webio_routes(index)))
app.mount("/feedback/", FastAPI(routes=webio_routes(feedback)))

feedback.py

@seo(SEO_TITLE, SEO_DESCRIPTION)
@config(theme="minty", js_file=[GA_JS_FILE], js_code=GA_JS_CODE)
def feedback() -> None:
    run_js(LANDING_PAGE_HEADING)
    run_js(FOOTER)

endpoint / is ok
endpoint /feedback is 404