In HTTP mode with LITESCRAPE_EDGE_SECRET set, the caller forwarded to the
API is CF-Connecting-IP from requests that carry the secret Cloudflare's
transform rule adds, and nothing is forwarded for a request that reached
the server directly. Behind Cloudflare the socket peer is one of its egress
addresses and X-Forwarded-For is a chain the API refuses, so this is what
mcp.litescrape.com needs. Without the variable, behaviour is unchanged.