Function post_with_headers_get_json

Takes a url, and data in form of URLSearchParams, and header, then performs http POST request and converts result to json then returns the json.

Example

Heres a post example that returns a json object.

const params = new URLSearchParams();
params.append('a', 1);
let headers = {} ; 
let url = "" ; 
let result = await post_with_headers_get_json(url, params, headers) ; 
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