While designing a single proxy service which will return different
formats- say for example json and xml, the response Content-Type plays a big
role in browsers or consumer systems understanding the return structure. If the
consumer receives the content –type populated as
application/json then it can have the json parser interpret the
data and if the response content-type is populated as
application/xml , then consumer can have the xml parser in action.
For this test I choose the proxy service which has Request-Response
message type as text, as the response can vary based on underlying service, as
well as consumer requirement. When you design you need to support all the
formats, so selecting TEXT type will be the best option.
The issue here is that response content-type will be text/plain by default. The solution is
to have a Transport-Header which will overwrite the Content-Type as required. You
can do it this way or have the Content-Type copied from the response header if
underlying service has set it properly.
Proxy response - no
transport header set
Response
Metadata
-- Default behavior of the proxy
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<con:metadata xmlns:con="http://www.bea.com/wli/sb/test/config">
<tran:headers xsi:type="http:HttpResponseHeaders"
xmlns:http="http://www.bea.com/wli/sb/transports/http"
xmlns:tran="http://www.bea.com/wli/sb/transports"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<http:Content-Type>text/plain;
charset=utf-8</http:Content-Type>
</tran:headers>
<tran:response-code xmlns:tran="http://www.bea.com/wli/sb/transports">0</tran:response-code>
<tran:encoding xmlns:tran="http://www.bea.com/wli/sb/transports">utf-8</tran:encoding>
</con:metadata>
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Proxy response -transport header is set
Response Metadata
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<con:metadata xmlns:con="http://www.bea.com/wli/sb/test/config">
<tran:headers xsi:type="http:HttpResponseHeaders"
xmlns:http="http://www.bea.com/wli/sb/transports/http"
xmlns:tran="http://www.bea.com/wli/sb/transports"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<http:Content-Type>application/json;
charset=utf-8</http:Content-Type>
</tran:headers>
<tran:response-code xmlns:tran="http://www.bea.com/wli/sb/transports">0</tran:response-code>
<tran:encoding xmlns:tran="http://www.bea.com/wli/sb/transports">utf-8</tran:encoding>
</con:metadata>
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