how to get x-forwarded-for header from api code example

Example: http_x_original_forwarded_for

Syntax
X-Forwarded-For: <client>, <proxy1>, <proxy2>

Examples:
X-Forwarded-For: 2001:db8:85a3:8d3:1319:8a2e:370:7348

X-Forwarded-For: 203.0.113.195

X-Forwarded-For: 203.0.113.195, 70.41.3.18, 150.172.238.178