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Preserving HTTP headers are important when executing backend services via applications/middleware. This is because most of the time certain important headers are removed or modified by the applications/middleware which run the communication. The previous version of our WSO2 ESB, version 4.8.1, only supported “server” and “user agent” header fields to preserve with, but with the new ESB 4.9.0, we’ve introduced a new new property (http.headers.preserve) for the passthru (repository/conf/passthru-http.properties) and Nhttp(repository/conf/nhttp.properties) transporters to preserve more HTTP headers. Passthru transporter – support header fields LocationKeep-AliveContent-LengthContent-TypeDateServerUser-AgentHostNhttp transport – support headersServerUser-AgentDate You can specify header fields which should be preserved in a comma-separated list, as shown below. http.headers.preserve = Location, Date, Server Note that properties(http.user.agent.preserve, http.server.preserve), which were used …
Before we talk about the failover message forwarding processor, it’s better to understand the big picture of the concepts and use cases. The Scheduled Failover Message Forwarding Processor is part of the bigger picture of themessage store and message processor.
Message Store Message Processor.
WSO2 ESB’s Message-stores and Message-processorsare used to store incoming messages and then deliver them to a particular backend with added Quality of Services (QoS), such as throttling and guaranteed delivery. The basic advantage of the MSMP is that it allows you to send messages reliably to a backend service. These messages can be stored in a different reliable storage such as JMS, JDBC message stores. The MSMP powered by three basic components:
1. Store Mediator. The Store mediator is the synapse mediator and can be used to store messages in the message store.
2. Message Store. A message store is storage in the ESB for messages. The WSO2 ESB comes with four types of message store implementations …