Description of problem:

Typically, if I set up a new Pulp instance I can set up a local content source to help populate it quickly. However, if I am using EC2, I can't use my region's local RHUI to help populate my Pulp.

The content source config allows for most of what I need: the CA, client cert and client key. However, RHUI in EC2 requires additional metadata from the cloud-init magic IP in the HTTP header to allow the request through. These settings are specific to an instance, but do not generally change once the instance is created.

If there was a way to specify additional HTTP headers in the content request, it would be let Pulp users set up RHUI as an alternate content source. A very basic way to do this would be to allow setting arbitrary HTTP headers in the conf file.