Caching Queries

Cached queries only work with HTTP documents. You can limit the length of queries that are cached, or you can completely inhibit caching of queries. The longer the query, the less likely it is to be repeated, and the less useful it is to cache.

The following caching restrictions apply for queries:

• The access method has to be GET, the document must not be protected (unless caching of authenticated pages is enabled), and the response must have at least a Last-modified header. This requires the query engine to indicate that the query result document can be cached.

• If the Last-modified header is present, the query engine should support a conditional GET method (with an If-modified-since header) in order to make caching effective; otherwise the query engine should return an Expires header.