`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.

delivery_mode  (number)    set to '1' for non-persistent or '2' for persistent queue
queue_dir      (path)      staging dir for undelivered messages e.g. '/home/events'
queue_limit    (number)    maximum limit for undelivered messages, defaults to '100000'
comment        (sentence)  optionally add a comment to this setting
```

Or environment variables

```
KEY:

				"image/x-xbitmap",
				"image/x-xcf",
				"image/x-xpixmap",
				"image/x-xwindowdump",
				"message/cpim",
				"message/delivery-status",
				"message/disposition-notification",
				"message/example",
				"message/external-body",
				"message/global",
				"message/global-delivery-status",
				"message/global-disposition-notification",
				"message/global-headers",
				"message/http",
				"message/imdn+xml",

            }
            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

		} else if err != io.ErrNoProgress {
			t.Error("unexpected error:", err)
		}
	case <-time.After(time.Second):
		t.Error("test timed out (endless loop in ReadByte?)")
	}
}

// A StringReader delivers its data one string segment at a time via Read.
type StringReader struct {
	data []string
	step int
}

func (r *StringReader) Read(p []byte) (n int, err error) {
	if r.step < len(r.data) {

# 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.