HTTP-NIO transport is a module of the Apache Synapse project. Apache Synapse (as well as the WSO2 ESB) ships the HTTP-NIO transport as the default HTTP transport implementation. The two classes that implement the receiver and sender APIs are org.apache.synapse.transport.nhttp.HttpCoreNIOListener and org.apache.synapse.transport.nhttp.HttpCoreNIOSender respectively. These classes are available in the JAR file named synapse-nhttp-transport.jar. This non-blocking transport implementation is one of the secrets behind the superior performance figures of the WSO2 ESB. The transport implementation is based on Apache HTTP Core - NIO and uses a configurable pool of non-blocking worker threads to grab incoming HTTP messages off the wire.
HTTP
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relay transport
Message Relay in older versions of Carbon was simply a message builder-formatter pair. You engage it on a per-content basis. Once engaged for a given content type, messages with that content type are streamed through Carbon. It ran on same old NHTTP transport.
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To enable this, remove the comment of the relevant HTTP transport entries in the axis2.xml. Also, comment out the usual settings for NHTTP transport receiver and sender.
Transport
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receiver parameters
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In transport parameter tables, literals displayed in italic mode under the "Possible Values" column should be considered as fixed literal constant values. Those values can be directly put in transport configurations. |
Parameter Name | Description | Required | Possible Values | Default Value |
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port | The port on which this transport receiver should listen for incoming messages. | No | A positive integer less than 65535 | 8280 |
non-blocking | Setting this parameter to true is vital for reliable messaging and a number of other scenarios to work properly. | Yes | true |
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bind-address | The address of the interface to which the transport listener should bind. | No | A host name or an IP address | 127.0.0.1 |
hostname | The host name of the server to be displayed in service EPRs, WSDLs etc. This parameter takes effect only when the WSDLEPRPrefix parameter is not set. | No | A host name or an IP address | localhost |
WSDLEPRPrefix | A URL prefix which will be added to all service EPRs and EPRs in WSDLs etc. | No | A URL of the form <protocol>://<hostname>:<port>/ |
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Transport
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sender parameters
Parameter Name | Description | RequriedRequired | Possible Values | Default Value |
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http.proxyHost | If the outgoing messages should be sent through an HTTP proxy server, use this parameter to specify the target proxy. | No | A host name or an IP address |
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http.proxyPort | The port through which the target proxy accepts HTTP traffic. | No | A positive integer less than 65535 |
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http.nonProxyHosts | The list of hosts to which the HTTP traffic should be sent directly without going through the proxy. | No | A list of host names or IP addresses separated by '|' |
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non-blocking | Setting this parameter to true is vital for reliable messaging and a number of other scenarios to work properly. | Yes | true |
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