downloading metadata from pull-through cache is slow

[dkliban]

Version
0.5.0

Describe the bug
When building a project with bundler, the metadata download step is significantly slower than when using rubygems.org directly as the source.

I believe this is because Pulp does not cache metadata. Maybe we could redirect users directly to the remote's URL for metadata?

[dkliban]

We were able to work around this issue by pointing bundler at rubygems.org and only configuring gem to use Pulp. This is only a workaround when using Pulp Gem plugin.

[mdellweg]

Does the client perform ranged requests to the metadata files?