JSON Example 2: POST/JSON Request, JSON Response (where POST is not supported)

CentraSite Documentation : Runtime Governance with CentraSite : Important Considerations when Configuring REST or XML Virtual Services : Working with the JSON Content-Type : JSON Example 2: POST/JSON Request, JSON Response (where POST is not supported)

In this example, a consumer sends a POST request (of Content-Type application/json) to a native service, but the native service does not support POST.

The request's Content-Type is application/json and its output parameter is set to xml. The reason for this is explained below.

The run-time processing will be as follows:

Consumer Sends	Mediator Sends Request to Provider	Mediator Receives Response from Provider	Mediator Sends Response to Consumer	Requirement for Bridging
POST/JSON	GET	XML	JSON	Request Processing step bridging Response Processing step bridging

Configure the virtual service as follows:

In the virtual service's Routing Protocols tab, set the value of the HTTP Method field to the value GET. Doing this instructs Mediator to change the POST to an HTTP GET before Mediator sends it to the native service (which is necessary because the native service does not support POST).

Write and invoke a webMethods IS service in the virtual service’s Invoke webMethods IS Service action. The IS service should include the following predefined context variables set to the values shown below. The request's "query": "wsdl20" and "output": "xml" parameters are transformed into query parameters on the URL before the native service is invoked. Thus, although the consumer is sending a JSON request, the native service is instructed to return an XML response to Mediator.

Context Variable	Value
MESSAGE_TYPE	application/x-www-form-urlencoded
BUILDER_TYPE	application/xml

Write and invoke a webMethods IS service in the virtual service’s Invoke webMethods IS Service action. The IS service should include the following predefined context variable set to the value shown below. Doing this instructs Mediator to bridge the XML response from the native service into JSON format, to be returned to the consumer:

Context Variable	Value
MESSAGE_TYPE	application/json

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