Check destination reachability (pre-create)
A pre-create reachability probe (dry-run — nothing is persisted). Checks a URL BEFORE the destination exists, so a client can gate creation on it. For sqs it runs the live GetQueueAttributes probe (ambient cross-account credentials); for https it runs an SSRF-gated HEAD/GET connect — reachable = DNS resolves + TCP/TLS connects + the server returns ANY HTTP status (401/403/404/405/5xx included); not reachable only on DNS failure, connection refused, TLS error, or timeout (with a human detail). pull is always { "ok": true }. A not-yet-deliverable broker type returns { "ok": false, "detail": "<type> delivery isn't supported yet" }.
Authorizations
Scoped API key. Scopes are read ⊂ write ⊂ admin. A call needing more scope than the key holds returns 403 insufficient_scope.
Request Body
Responses
The reachability verdict.