Option Name:httpd_accel_surrogate_id
Replaces:
Requires:--enable-esi
Default Value:httpd_accel_surrogate_id unset-id
Suggested Config:

	Surrogates (http://www.esi.org/architecture_spec_1.0.html)
	need an identification token to allow control targeting. Because
	a farm of surrogates may all perform the same tasks, they may share
	an identification token.