API Management transforms a SOAP API into JSON API

continent-names.xml

<policies>
    <inbound>
        <base />
        <rewrite-uri template="/websamples.countryinfo/CountryInfoService.wso" copy-unmatched-params="false" />
        <set-body template="liquid">
			<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns="http://www.oorsprong.org/websamples.countryinfo" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
				<soap:Body>
					<ListOfContinentsByName>
					</ListOfContinentsByName>
				</soap:Body>
			</soap:Envelope>
		</set-body>
        <set-header name="Content-Type" exists-action="override">
            <value>application/soap+xml; Action="ListOfContinentsByName"</value>
        </set-header>
        <set-method>POST</set-method>
    </inbound>
    <backend>
        <base />
    </backend>
    <outbound>
        <base />
        <choose>
            <when condition="@(context.Response.StatusCode < 400)">
                <set-body template="liquid">
        {
            "continents": 
                [
                    {% JSONArrayFor item in body.envelope.body.ListOfContinentsByNameResponse.ListOfContinentsByNameResult -%}
                    {
                        "code": {% if item.sCode %}"{{item.sCode | Replace: '\r', '\r' | Replace: '\n', '\n' | Replace: '([^\\](\\\\)*)"', '$1\"'}}"{% else %} null {% endif %},
                        "name": {% if item.sName %}"{{item.sName | Replace: '\r', '\r' | Replace: '\n', '\n' | Replace: '([^\\](\\\\)*)"', '$1\"'}}"{% else %} null {% endif %}
                    }
                    {% endJSONArrayFor -%}
                ]            
        }</set-body>
            </when>
            <otherwise>
                <set-variable name="old-body" value="@(context.Response.Body.As<string>(preserveContent: true))" />
                <!-- Error response as per https://github.com/Microsoft/api-guidelines/blob/master/Guidelines.md#7102-error-condition-responses -->
                <set-body template="liquid">{
            "error": {
                "code": "{{body.envelope.body.fault.faultcode}}",
                "message": "{{body.envelope.body.fault.faultstring}}"
            }
        }</set-body>
                <choose>
                    <when condition="@(string.IsNullOrEmpty(context.Response.Body.As<JObject>(preserveContent: true)["error"]["code"].ToString()) && string.IsNullOrEmpty(context.Response.Body.As<JObject>(preserveContent: true)["error"]["message"].ToString()))">
                        <set-body>@{
                    var newResponseBody = new JObject();
                    newResponseBody["error"] = new JObject();
                    newResponseBody["error"]["code"] = "InvalidErrorResponseBody";
                    if (string.IsNullOrEmpty((string)context.Variables["old-body"]))
                    {
                        newResponseBody["error"]["message"] = "The error response body was not a valid SOAP error response. The response body was empty.";
                    }
                    else
                    {
                        newResponseBody["error"]["message"] = "The error response body was not a valid SOAP error response. The response body was: '" + context.Variables["old-body"] + "'.";
                    }
                    return newResponseBody.ToString();
                }</set-body>
                    </when>
                </choose>
            </otherwise>
        </choose>
        <set-header name="Content-Type" exists-action="override">
            <value>application/json</value>
        </set-header>
    </outbound>
    <on-error>
        <base />
    </on-error>
</policies>