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Define custom headers when doing a POST request

How to define custom POST request headers before making the request on your WordPress site based on the URL.
function f4d_modify_http_request_args($parsed_args, $url){
// Replace XXX with whatever URL you put inside the "Enter a custom form post URL" setting
// For example if you are doing a post request to
// replace XXX with that exact URL
// Update headers, of course you can also alter other arguments if needed
// Default arguments provided by WordPress:
$parsed_args['headers'] = array(
'Content-Type' => 'application/json; charset=utf-8',
'ClientID' => 'xxx',
'Authentication' => 'Basic & Base64 Encoded'
return $parsed_args;
add_filter( 'http_request_args', 'f4d_modify_http_request_args', 10, 2 );