Break the dependency of MaintenanceModeSubscriber on DefaultHtmlPageRenderer

Created on 1 July 2014, about 11 years ago
Updated 5 August 2025, about 20 hours ago

Problem/Motivation

The MaintenanceModeSubscriber currently renders the maintenance page by directly calling DefaultHtmlPageRenderer::renderPage.

Proposed resolution

Throw an ServiceUnavailableHttpException and render the page from within ExceptionController. This involves dealing with some problems related to the controller being run from within a subrequest and the symfony ExceptionListener treating everything with status code >=500 as a critical error.

See #2288665-15: Remove _maintenance request attribute and replace it with a maintenance mode service β†’ and #23.

Remaining tasks

User interface changes

API changes

Follow-up to #2288665: Remove _maintenance request attribute and replace it with a maintenance mode service β†’

πŸ“Œ Task
Status

Postponed: needs info

Version

11.0 πŸ”₯

Component

base system

Created by

πŸ‡¨πŸ‡­Switzerland znerol

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  • πŸ‡ΊπŸ‡ΈUnited States smustgrave

    Thank you for creating this issue to improve Drupal.

    We are working to decide if this task is still relevant to a currently supported version of Drupal. There hasn't been any discussion here for over 8 years which suggests that this has either been implemented or is no longer relevant. Your thoughts on this will allow a decision to be made.

    Since we need more information to move forward with this issue, the status is now Postponed (maintainer needs more info). If we don't receive additional information to help with the issue, it may be closed after three months.

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