[8.x] Maintenance mode: Fix empty Retry-After header #34412
Merged
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When maintenance mode is enabled with a prerendered template, an empty
Retry-After
header is sent when the site is accessed.This is because if
--render
is the only option set, the Retry-After header is always sent, regardless of whether--retry
was set.Let's check for the presence of a
retry
value before sending theRetry-After
header.