baiuu opened a new issue, #13739:
URL: https://github.com/apache/apisix/issues/13739
### Description
### Body
Currently, the `body` configured in the `error-page` plugin metadata is
returned to clients as a static string. In practice, operators often want to
embed request-scoped information into custom error pages — most commonly the
**request ID**, so that end users can report it and administrators can
correlate the error page with access/error logs.
### Proposal
Resolve Nginx variables (via `core.utils.resolve_var`, the same mechanism
used by `response-rewrite` headers) in the error page `body` before sending the
response:
```json
{
"enable": true,
"error_404": {
"body": "<html><body><h1>404 Not Found</h1><p>Request ID:
$request_id</p></body></html>"
}
}
```
- Variables are resolved in `header_filter` so that `Content-Length` is
computed from the **final rendered body** (avoids truncation/stalling).
- Supports `$var`, `${var}`, the `??` default-value operator, and `\$`
escaping — identical semantics to `response-rewrite` header values.
- No schema changes; fully backward compatible (bodies without `$` are
returned unchanged, short-circuited before regex processing).
### Use cases
- `$request_id` — request tracing / log correlation (the primary motivation)
- `$remote_addr`, `$host`, `$uri`, `$time_iso8601` — richer diagnostic error
pages
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