Outreach link probes enforce security through an SSRF guard that blocks private, loopback, and cloud metadata addresses while executing single-byte range GET requests and re-validating every redirect hop.
flowchart LR
A[Target URL] --> B[DNS Resolution]
B --> C{Public IP?}
C -- No / Metadata --> D[Block & Mark Dead]
C -- Yes --> E[Range GET: bytes=0-0]
E --> F{Redirect 30x?}
F -- Yes --> G[Re-validate Hop]
G --> B
F -- No --> H{Status Code}
H -- 2xx / 3xx --> I[Keep Live Link]
H -- 4xx / 5xx / Error --> J[Unwrap to Plain Text]