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Exposing a Proxy Service via Inbound Endpoint

If a proxy service is to be exposed only via inbound endpoints, the inbound.only service parameter has to be set in the proxy configuration.

Synapse configuration

Following is a sample proxy service configuration that we can used to implement this scenario. See the instructions on how to build and run this example.

Proxy Service

<proxy xmlns="http://ws.apache.org/ns/synapse" name="InboundProxy" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
        <target>
            <outSequence>
                <send/>
            </outSequence>
            <endpoint>
                <address uri="http://localhost:9000/services/SimpleStockQuoteService"/>
            </endpoint>
        </target>
        <parameter name="inbound.only">true</parameter>
</proxy>

Inbound Endpoint

<inboundEndpoint xmlns="http://ws.apache.org/ns/synapse"
                 name="inbound1"
                 sequence="super"
                 onError="fault"
                 protocol="http"
                 suspend="false">
   <parameters>
      <parameter name="dispatch.filter.pattern">.*</parameter>
      <parameter name="inbound.http.port">9090</parameter>
   </parameters>
</inboundEndpoint>

Build and run

Create the artifacts:

1. Set up ESB Integration Studio.
2. Create an integration project with an ESB Configs module and an Composite Exporter.
3. Create the proxy service and security policy with the configurations given above.
4. Deploy the artifacts in your Micro Integrator.

Set up the back-end service:

1. Download the back-end service.
2. Extract the downloaded zip file.
3. Open a terminal, navigate to the axis2Server/bin/ directory inside the extracted folder.

4. Execute the following command to start the axis2server with the SimpleStockQuote back-end service:

   On MacOS/Linux/CentOS

   sh axis2server.sh

   On Windows

   axis2server.bat

Send the following request to the Micro Integrator.

POST http://localhost:9090/services/InboundProxy HTTP/1.1
Accept-Encoding: gzip,deflate
Content-Type: text/xml;charset=UTF-8
SOAPAction: "urn:getQuote"
Content-Length: 492
Host: localhost:9090
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.1.1 (java 1.5)

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.samples" xmlns:xsd="http://services.samples/xsd">
   <soapenv:Header/>
   <soapenv:Body>
      <ser:getQuote xmlns:ser="http://services.samples" xmlns:xsd="http://services.samples/xsd">
         <ser:request>
            <xsd:symbol>IBM</xsd:symbol>
         </ser:request>
      </ser:getQuote>
   </soapenv:Body>
</soapenv:Envelope>

You will get the following response:

HTTP/1.1 200 OK
server: ballerina
content-encoding: gzip
content-type: application/xml
Date: Thu, 31 Oct 2019 05:18:32 GMT
Transfer-Encoding: chunked
Connection: Keep-Alive

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns="http://services.samples" xmlns:ax21="http://services.samples/xsd">
    <soapenv:Body>
        <ns:getQuoteResponse>
                <ax21:change>-2.86843917118114</ax21:change>
                <ax21:earnings>-8.540305401672558</ax21:earnings>
                <ax21:high>-176.67958828498735</ax21:high>
                <ax21:last>177.66987465262923</ax21:last>
                <ax21:low>-176.30898912339075</ax21:low>
                <ax21:marketCap>5.649557998178506E7</ax21:marketCap>
                <ax21:name>IBM Company</ax21:name>
                <ax21:open>185.62740369461244</ax21:open>
                <ax21:peRatio>24.341353665128693</ax21:peRatio>
                <ax21:percentageChange>-1.4930577008849097</ax21:percentageChange>
                <ax21:prevClose>192.11844053187397</ax21:prevClose>
                <ax21:symbol>IBM</ax21:symbol>
                <ax21:volume>7791</ax21:volume>
        </ns:getQuoteResponse>
    </soapenv:Body>
</soapenv:Envelope>

When the proxy service is directly invoked, you will not get the response payload.

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