Domain module implements checks that based on domain table determine if a host part of an URIi [1] is "local" or not. A "local" domain is one that the proxy is responsible for.

Domain module operates in caching or non-caching mode depending on value of module parameter db_mode. In caching mode domain module reads the contents of domain table into cache memory when the module is loaded. After that domain table is re-read only when module is given domain_reload fifo command. Any changes in domain table must thus be followed by domain_reload command in order to reflect them in module behavior. In non-caching mode domain module always queries domain table in the database.

Juha Heinanen