Splunk REST API: Bypass response format check

Splunk Enterprise

I am trying to host Prometheus metrics on a Splunk app such that the metrics are available at `.../my_app/v1/metrics` endpoint.

I am able to create a handler of type PersistentServerConnectionApplication and have it return Prometheus metrics. The response status, however, code = `500` and content = `Unexpected character while looking for value: '#'`

Prometheus metrics do not confirm to any of the supported `output_modes`

(atom | csv | json | json_cols | json_rows | raw | xml)

so I get the same error irrespective of the output mode chosen.

Is there a way to bypass the output check? Is there any other alternative to host a non-confirming-format output via a Splunk REST API?

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