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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 WSO2 Integration Studio.
2. Create an ESB Solution project
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 stockquote_service.jar.

2. Open a terminal, navigate to the location of the downloaded service, and run it using the following command:

   java -jar stockquote_service.jar

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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