Function resolveSourceIp

resolveSourceIp(
event: TencentScfHttpEvent,
headers: Record<string, string>,
): string
Resolve the client source IP: requestContext.sourceIp, then the first X-Forwarded-For hop.
Parameters
- event: TencentScfHttpEvent
  The raw SCF event.
- headers: Record<string, string>
  The normalized headers.
Returns string
The source IP (empty string if unknown).