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RestClientApp

REST Client Application Configuration

The N2SVCD REST Client Application supports sending of REST requests over HTTP.

Typical uses of the RestClientApp are:

Any LogicApp Lua script (e.g. a test script or a service script) can initiate outbound REST requests (via the RestLuaAgent agent plugin).
A JSON-format TesterApp script can use the rest.Request Test operation to use RestClientApp to send outbound REST requests.

This is done by internally sending and receiving REST-... messages over the n2svcd message bus.

See the N2SVCD Configuration Overview for more information on how the REST Application interacts with other components.

The following configuration is used to create a REST Client Application instance.

<?xml version="1.0" encoding="utf-8"?>
<n2svcd>
  ...
  <applications>
    ...
    <application name="REST-CLIENT" module="RestClientApp">
      <include><lib>../apps/rest_c/lib</lib></include>
      <parameters>
        <parameter name="trace_level"            value="0"/>
        <parameter name="remote_host"            value="localhost"/>
        <parameter name="remote_port"            value="8118"/>
        <parameter name="path"                   value="/servlet/ABC"/>
        <parameter name="num_client_connections" value="3"/>
        <parameter name="server_timeout"         value="2"/>
        <parameter name="ping_interval"          value="3"/>
        <parameter name="ping_path"             value="/ping"/>
        <parameter name="ping_expected_code"     value="200"/>
      </parameters>
      <config>
        <http_headers>
          <http_header name="x-api-key" value="aaaaaa-bbbbbb-ccccc-dddddd"/>
        </http_headers>
      </config>
    </application>
    ...
  </application>
  ...
</n2svcd>

Configuration Details

The application element attributes for a REST Client Application instance may include the below.

For details of the various parameter types used, refer to Common Configuration.

Parameter Name	Type	XML Type	Description
See: Common Application configuration
See: TCP Application configuration
`module`	String	Attribute	[Required] `RestClientApp`
`include.lib`	String	Element	[Required] `../apps/rest_c/lib`
`parameters`	Array	Element	[Required] As per Common Configuration Application `parameters`.
`"edr_enabled"`	-	-	This value is ignored; the REST Client Application does not support writing EDRs.
`"socket_mode"`	String	Attribute	The REST Client Application supports only `connect` (TCP Client). (Default = `connect`)
`"remote_host"`	String	Attribute	[Required] As per common TCP configuration for `remote_host`.
`"remote_port"`	Integer	Attribute	As per common TCP configuration for `remote_port`. (Default = `80`)
`"ping_supported"`	Boolean	Attribute	Whether or not the Rest Client App should perform ping checks against a configured rest path. (Default = False)
`"ping_path"`	String	Attribute	The path component of the Ping REST URL. (Default = No Default)
`"ping_expected_code"`	String	Attribute	The expected HTTP response code(s) to check for when executing Ping checks against the configured `ping_path`. If the response code is not present or does not match the expected response code the application will be set as `OFFLINE`. (Default = 200) May be a single response code, or a comma-separated list if multiple response codes are valid.
`"path"`	String	Attribute	The default path component of the REST URL. This may be overridden for each request. (Default = No Default)
`"security"`	String	Attribute	The security for the HTTP Interaction, either `basic` or `none`. This may be overridden for each request. (Default = `none`)
`"username"`	String	Attribute	The HTTP Basic Access Authentication username to use for the HTTP Interaction. This may be overridden for each request. (Default = No Default)
`"password"`	String	Attribute	The HTTP Basic Access Authentication password to use for the HTTP Interaction. This may be overridden for each request. (Default = No Default)
`config`	Object	Element	Container for extended configuration for this Application instance.
`.http_headers`	Array	Element	Array of REST `http_header` elements for additional HTTP headers to send with each REST operation.

REST Headers

Each http_header Object in the config.http_headers Array is configured as follows.

Parameter Name	Type	XML Type	Description
`name`	String	Attribute	[Required] The HTTP Header key.
`value`	String	Attribute	[Required] The HTTP Header Value.

Each configured HTTP header will be appended to all outbound REST requests.

Application-defined static HTTP headers will be added first. Per-request HTTP headers will be added subsequently.

Message Handling

In addition to the common Application management messages, the REST Client Application uses the following messages:

REST-C Messages (REST-C-REQUEST outbound).