This repository is the OSG implementation of an XCache (XRootD Caching Proxy) setup. XCache allows one to setup a "cache" server which saves frequently-accessed files at a specified "origin" to local storage, allowing repeated accesses of the same resource to be served without having to transfer them multiple times over the wide-area-network.

XCache is not a generic HTTP cache. Files in the cache do not expire, nor are there integrity checking mechanism such as HTTP's ETag. Unlike many HTTP caches, it can stream partial responses: if the client requests only a few bytes from a multi-gigabyte resource, XCache will send the response before the full download completes.

XCache installation is covered in the OSG documentation

The OSG packaging features:

• Data can be exported via the HTTP, HTTPS, and Xrootd protocols.
• Configurations for both running an origin and running a cache.
• Integrated authentication and authorization for caches.
• Usage monitoring integrated with OSG's monitoring services.