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Improve error messages for invalid view function return types

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This commit is contained in:
Gizem Kavas 2025-03-01 01:16:11 +00:00
parent f61172b8dd
commit cf97066080
1 changed files with 12 additions and 5 deletions
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17
src/flask/app.py
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@ -1247,11 +1247,18 @@ class Flask(App):
).with_traceback(sys.exc_info()[2]) from None
else:
raise TypeError(
"The view function did not return a valid"
" response. The return type must be a string,"
" dict, list, tuple with headers or status,"
" Response instance, or WSGI callable, but it was a"
f" {type(rv).__name__}."
f"The view function for {request.endpoint!r} did not return"
" a valid response.\n\n Valid return types are:\n"
"- str or bytes: converted to a response with the string as body\n"
"- dict or list: converted to a JSON response\n"
"- tuple: either (body, status, headers), (body, status),"
" or (body, headers)\n where body is any of the other types,"
" status is an integer, and headers is a dict\n"
"- Response instance: used as-is\n"
"- WSGI callable: called with the WSGI environment\n\n"
f"it was a {type(rv).__name__}.\n See "
"https://flask.palletsprojects.com/en/latest/quickstart/#about-responses"
" for more details."
)
rv = t.cast(Response, rv)