`NullPointerException` or `OutOfMemoryError`. We now call `Callback.onFailure()` with an
    `IOException` that reports the call as canceled. The triggering exception is still delivered to
    the thread's `UncaughtExceptionHandler`.
 *  Fix: Don't evict incomplete entries when iterating the cache. We had a bug where iterating
    `Cache.urls()` would prevent in-flight entries from being written.

            }
            return returnUrl;
        }
        return null;
    }

    /**
     * Creates a stream response for document content delivery.
     * Handles content retrieval and streaming to the client.
     *
     * @param doc the document data map
     * @return the stream response containing document content

# LDAP attribute for pager.
ldap.attr.pager=pager
# LDAP attribute for street.
ldap.attr.street=street
# LDAP attribute for postal code.
ldap.attr.postalCode=postalCode
# LDAP attribute for physical delivery office name.
ldap.attr.physicalDeliveryOfficeName=physicalDeliveryOfficeName
# LDAP attribute for destination indicator.
ldap.attr.destinationIndicator=destinationIndicator
# LDAP attribute for international ISDN number.