Add HTTP Method as a Parameter for APIs that support POST #302
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I'm adding extra method parameter for PrometheusConnect class (default is GET), so that users can toggle to use POST for Prometheus APIs that support it, such as /query, /query_range and /labels, as some prefer POST due to it being able to handle larger and more complex queries.
Other APIs, such as /label/{1}/values, /targets, /targets/metadata and /metadata, will still only use GET method and are not affected by the method parameter. I also switch to use request() method for the session object across all requests to make it consistent.
I used the official Prometheus documentation as the main reference: https://prometheus.io/docs/prometheus/latest/querying/api/