CUSTOM HTTP HEADER AND VIRTUAL REST API

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1

We have a virtual REST API defined for a native API and in the virtual API request processing step ( via IS service), we would like to capture the HTTP ( a CUSTOM) header name and value and do some processing. In our particular case getting a token via header and validate it against some IDP.

We tried to use pub.mediator.ctxvar:getContextVariable API to get the incoming header value - let say CUST_TOKEN and its value but not able to get it. Any advice is greatly appreciated.

Mediator and CentraSite v9.7 is being used.

2

Hi, your approach is correct, but you cannot access your header directly using its name. Use predefined context variable name “PROTOCOL_HEADERS” or “SOAP_HEADERS” while using pub.mediator.ctxvar:getContextVariable service.
All context variable values are typed as either “string” or “int” except for the predefined context variables PROTOCOL_HEADERS and SOAP_HEADERS, which are of the type “IData”. This IData Contains a map of key-value pairs in the request, where the values are strings. Put a tracePipeline or savePipeline after calling the getContextVariable service and see if your header is present in one of these key/value pair outcomes.

3

Thank you! for very quick reply.

I tried to set the pub.mediator.ctxvar:getContextVariable input varName with value as PROTOCOL_HEADERS and expecting the output to serValue (IData) from which I want to iterate to get the key/value of headers, but nothing returns to serValue from pub.mediator.ctxvar:getContextVariableservice.

When I try to debug the service - I get an error as follows

“Attempt to reference context variable without providing message context. etc”

4

From my experience, this header handler and requestProcessor services do not work while debugging due to MessageContext issue. Even save/restore pipeline won’t help. Please try to use “tracePipeline” service after the “getContextVariable” step and check server logs if anything gets printed for serValue?

5

Super. It worked. Thanks a lot.

One other question though -

Would it be possible to throw an exception to consumer ( for Virtual REST API) when a certain condition is not met request processing service? Basically, I am checking for a token in the request processing step and when this token is not valid I want to stop right there and throw an exception to the user. Please advise.