protoRegex = regexp.MustCompile(`(?i)^(;|,| )+(?:proto=)(https|http)`)
)

// Used to disable all processing of the X-Forwarded-For header in source IP discovery.
var enableXFFHeader = env.Get("_MINIO_API_XFF_HEADER", config.EnableOn) == config.EnableOn

// GetSourceScheme retrieves the scheme from the X-Forwarded-Proto and RFC7239
// Forwarded headers (in that order).
func GetSourceScheme(r *http.Request) string {