GET/POST operation to make a REST API put values onto a UI

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What operation should we use in the REST API to put values to a UI , as we are trying to push the values from one component (OIA interview) to (OCE) through OIC. We tried with POST operation but we are getting various types of errors such as Error 503, Internal Server Error 500. Please suggest, as to what operation should we use if we need to deploy the values from one UI to another UI. If we do a random operation of deploying the values from one UI to another UI, what operation should we use , in general?

 

Thanks and Regards