Fix Flask-WTF/Quart-WTF CSRF exemptions broken by backend refactor#3885
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The backend refactor moved callback dispatching from Dash.dispatch into
nested closures in the backend modules, changing the view function's
fully-qualified name from dash.dash.dispatch to
dash.backends._flask._dispatch. Flask-WTF's CSRFProtect exempts views by
that name, so csrf._exempt_views.add("dash.dash.dispatch") silently
stopped working, raising "The CSRF token is missing." on every callback.
Restore the dispatch view's identity to dash.dash.dispatch in the Flask
and Quart backends so existing exemptions keep working.
Fixes #3827
camdecoster
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Jul 13, 2026
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Do you need to add a similar fix for fastapi?
Co-authored-by: Cameron DeCoster <cameron.decoster@gmail.com>
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No, fastapi uses a different system that is middleware based. |
camdecoster
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Jul 14, 2026
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The backend refactor moved callback dispatching from
Dash.dispatchinto nested closures in the backend modules, changing the view function's fully-qualified name from dash.dash.dispatch todash.backends._flask._dispatch. Flask-WTF's CSRFProtect exempts views by that name, socsrf._exempt_views.add("dash.dash.dispatch")silently stopped working, raising "The CSRF token is missing." on every callback.Restore the dispatch view's identity to dash.dash.dispatch in the Flask and Quart backends so existing exemptions keep working.
Fixes #3827