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Fixed
The hosted MCP endpoint answered every request with 421 Invalid Host header. The transport enables DNS-rebinding protection whenever the app is
built for its default 127.0.0.1 host, and then allows only localhost — so
nothing reaching bytecrawl.vercel.app got through. That protection is for a
server bound to your own machine; this one is public, unauthenticated and
already behind an SSRF guard, so it now ships open. Set BYTECRAWL_ALLOWED_HOSTS (and BYTECRAWL_ALLOWED_ORIGINS) to turn it back on
if you self-host on a domain that also serves authenticated apps.