Interface Envelope

Creating application id.

MIME content encoding. e.g. "gzip"

MIME content type. e.g. "application/json"

Application correlation identifier.

Alias for "deliveryMode". Published message should be saved to disk and should survive server restarts.

Specifies the name of the exchange to publish to. The exchange name can be empty, meaning the default exchange. If the exchange name is specified, and that exchange does not exist, the server will raise a channel exception.

Message TTL, in milliseconds. Note that only when expired messages reach the head of a queue will they actually be discarded (or dead-lettered). Setting the TTL to 0 causes messages to be expired upon reaching a queue unless they can be delivered to a consumer immediately.

Additional user-defined fields

This flag tells the server how to react if the message cannot be routed to a queue consumer immediately. If this flag is set, the server will return an undeliverable message with a Return method. If this flag is zero, the server will queue the message, but with no guarantee that it will ever be consumed.

This flag tells the server how to react if the message cannot be routed to a queue. If this flag is set, the server will return an unroutable message with a Return method. If this flag is zero, the server silently drops the message.

Application message identifier.

Message priority, 0 to 9.

https://www.rabbitmq.com/direct-reply-to.html

Specifies the routing key for the message. The routing key is used for routing messages depending on the exchange configuration.

Message timestamp in seconds.

Message type name.

Creating user id.