In order for the DSP to know what information it is that you want to receive, there is a format to creating an oracle request.
Each of the following oracle request types comes equipped with its own syntax that gets encoded with Buffer.from("<URI HERE>", 'utf8'). The following guide will explain the syntax to generate your URI. Each URI should be passed through the buffer as plaintext is not accepted.
NodeJS example:
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const body = Buffer.from('{"block_num_or_id":"36568000"}').toString('base64')