KIP-404 — Add Kafka Connect configuration parameter for disabling WADL output on OPTIONS request

Discarded Kafka 2.0.2 Connect

KIP-404 (discarded, treated as a bug) proposed adding a `rest.wadl.enable` config to the Kafka Connect REST server so operators can disable the auto-generated WADL document returned on `OPTIONS` requests. The auto-generated WADL exposes the full API surface as structured XML, which can be a security concern in hardened environments where minimizing information disclosure is required.

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