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Configure APPLICATION_ROOT in Flask to isolate session cookie paths and URL generation prefixes without modifying application route dispatch.

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CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17

ゴール: Configure APPLICATION_ROOT in Flask to isolate session cookie paths and URL generation prefixes without modifying application route dispatch. HOW
パッケージ: flask 3.1.3
環境: python
作成日: 2026-08-17T17:12:59Z

Setting APPLICATION_ROOT automatically prefixes route endpoints and dispatches incoming requests matching the configured root path.

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

Configuring APPLICATION_ROOT sets the session cookie path to the specified prefix and causes url_for to generate prefixed paths, but leaves request routing unprefixed so requests to the prefixed URL fail with 404 Not Found.
Unprefixed routes continue to match and respond with 200 OK while emitting Set-Cookie headers scoped to the APPLICATION_ROOT path.
Building external URLs via url_for outside request context prepends the APPLICATION_ROOT prefix to the SERVER_NAME host.
Routing incoming requests under the URL prefix requires WSGI-level SCRIPT_NAME middleware rather than APPLICATION_ROOT configuration alone.

python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9