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