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Story #8083

Updated by bmbouter about 2 years ago

## Use Cases 

 1. For RPM content, oracle linux needs headers sent for the server to respond properly. You can see this work started in these PR:    https://github.com/pulp/pulpcore/pull/1041 and https://github.com/pulp/pulp_rpm/pull/1896/ 

 2. For syncing content using Alternate Content Sources from Pulp instances in EC2, e.g. RHUI servers it also requires headers to be sent with downloads. 

 ## Solution 

 Given that there are two use cases for headers, and headers are a generic HTTP downloading concept, let's add them to BaseRemote and have the DownloadFactory create downloaders with them. 

 These headers are ultimately passed to aiohttp as a dictionary [per their docs](https://docs.aiohttp.org/en/stable/client_advanced.html#custom-request-headers) so let's store the field in DRF as a [DictField](https://www.django-rest-framework.org/api-guide/fields/#dictfield). 

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