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HTTP-NIO transport is a module of the Apache Synapse project. 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. 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.


Transport receiver parameters

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

Requried

Possible Values

Default Value

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 a number of scenarios to work properly.

Yes

true/false

true

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>/

 

Transport sender parameters

Parameter Name

Description

Requried

Possible Values

Default Value

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

 

http.proxyPort

The port through which the target proxy accepts HTTP traffic.

No

A positive integer less than 65535

 

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 '|'

 

non-blocking

Setting this parameter to true is vital for a number of scenarios to work properly.

Yes

true/false

true

For more information, see Working with Transports.

Connection throttling

With the HTTP PassThrough and HTTP NIO transports, you can enable connection throttling to restrict the number of simultaneous open connections. To enable connection throttling, edit the <EI_HOME>/conf/nhttp.properties (for the HTTP NIO transport) or <EI_HOME>/conf/passthru-http.properties (for the PassThrough transport) and add the following line:

max_open_connections = 2

This will restrict simultaneous open incoming connections to 2. To disable throttling, delete the max_open_connections setting or set it to -1.

Connection throttling is never exact. For example, setting this property to 2 will result in roughly two simultaneous open connections at any given time.

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