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Generating an Outgoing AS2 Message

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The AS2EDISend and AS2Send send pipelines generate an outbound message as follows. Each pipeline uses the properties in the one-way agreement tab of the Agreement Properties dialog box to generate the outgoing AS2 message.

Agreement, Destination, and MessageID Determination

The AS2 send pipelines determine the agreement and destination to be used in sending an AS2 message as follows:

  • To determine the agreement to use in processing an outgoing message, the AS2 encoder attempts to match the AS2-To properties in the message and the AS2Identity for a party’s business profile, or the send port subscribing to the message with a send port associated with the agreement. For more information on this process, see Agreement Resolution for Outgoing AS2 Messages.

  • To determine the destination of the message, the send pipeline in a dynamic send port uses the OutboundTransportLocation property, which must be written or promoted to the context by a backend application for the dynamic send port to work. The send pipeline in a static send pipeline will determine the destination from the AS2-From property in the AS2 agreement properties and the identities of the business profile properties.

  • The AS2 Encoder needs to set the MessageId header of an outgoing AS2 message. The send pipeline determines the MessageId from either the EdiIntAS.MessageId context property or the HTTP.UserHttpHeaders context property. If both of those context properties are set, the encoder uses the value from the HTTP.UserHttpHeaders context property. If neither of them is set, the send pipeline autogenerates a value for MessageID.

Outgoing Message Processing

The steps that the AS2 send pipelines use in processing an outgoing AS2 message are as follows:

  • Makes a copy of the message in native format, and stores the copy in the non-repudiation database, if non-repudiation of AS2 messages is enabled in agreement properties.

  • The AS2 Encoder builds the HTTP (and AS2) headers into the HTTP.UserHttpHeaders context property. For more information on this process, see Send-Side Processing of an Outgoing EDI Message over AS2.

  • Writes HTTP.UserHttpHeaders to the context.

  • Compresses the outgoing message, if enabled.

  • Performs MIME processing, including encrypting the message (if enabled in the Message should be encrypted agreement property) and applying a digital signature (if enabled in the Message should be signed agreement properties). The AS2Send pipeline uses either SHA1 or MD5 to apply the signature, based upon agreement settings.

  • Creates a Content-Disposition MIME header containing the specified value, if transmit file name is enabled in agreement properties.

  • Makes a copy of the encrypted message (in wire format), and stores the copy in the non-repudiation database, if enabled in the NRR enabled for outbound encoded AS2 messages in the agreement property.

  • If an MDN is required, computes the MIC value and stores it in the data store.

  • Delivers the message to the HTTP adapter, which writes the headers from the UserHTTPHeaders context property into the outgoing AS2 message.

  • If reliable messaging is required, resends the message until an MDN is received.

See Also

How BizTalk Server Sends AS2 Messages
AS2 Send Components