- inspectFeed fetches via SafeHttpFetcher::get (SSRF guard + timeout + redirect
cap + UA) instead of a raw, timeout-less Http::get; add a timeout to the node fetch.
- ResolvableUrl now requires an http(s) scheme, so it's no weaker than the plain
url rule it replaced (rejects file://, javascript://).
- Apply ResolvableUrl to the HTTP Request and Webhook node URLs too, so templated
{{ }} URLs validate consistently across every URL field.
- Clear a fetch_rss node's discovered_fields when its feed_url changes, so stale
fields from the previous feed stop showing up as autocomplete suggestions.
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