The engine issues a single-byte range request to verify the HTTP status without downloading the full body, avoiding server-side HEAD blocks while minimizing network transfer.
sequenceDiagram
participant App as Outreach Probe
participant Srv as Target Web Server
App->>Srv: GET /article (Range: bytes=0-0)
Note over Srv: Checks URL validity
Srv-->>App: 206 Partial Content / 200 OK
Note over App: Reads status & closes socket
App-->>App: Classify as liveReferenced by