:sig
String memcache_get(u64 connection, String key, String default_value = "")

:params
connection : connection handle
key : key string
default_value : optional default value
return value : value that was returned by the Memcache server

:see
>memcache

:content
Retrieves a value from an existing Memcache connection.

If the key is missing, `default_value` is returned instead.

:example
print("memcache_get is resource-bound; configure the service or connection, then call it in request code.\n");