List of allowed URIs (resp. the beginning of them).
Location where resource content is stored for lockfile entries. It's also possible to disable storing by passing false.
When set, anything that would lead to a modification of the lockfile or any resource content, will result in an error.
Location of the lockfile.
Proxy configuration, which can be used to specify a proxy server to use for HTTP requests.
When set, resources of existing lockfile entries will be fetched and entries will be upgraded when resource content has changed.
Options for building http resources.