wp_remote_post & Authorization header

Hi, I’m developing a plugin and have a need to post to an API and include an Authorization header.

	
$basicauth = 'Basic ' . base64_encode( $client_id . ':' . $client_secret );

$headers = array( 
		'Authorization' => $basicauth,
		'Content-type' => 'application/json',
		'Content-length' => $contentlen
		);

$pload = array(
	'method' => 'POST',
	'timeout' => 30,
	'redirection' => 5,
	'httpversion' => '1.0',
	'blocking' => true,
	'headers' => $headers,
	'body' => $bdy,
	'cookies' => array()
	);

$response = wp_remote_post($url, $pload);

So since the remote was returning to me a 500 I decided to post to myself to see what I’m sending.

This is what pload is looking like:

pload: Array
(
    [method] => POST
    [timeout] => 30
    [redirection] => 5
    [httpversion] => 1.0
    [blocking] => 1
    [headers] => Array
        (
            [Authorization] => Basic NzYblahblahblahblah0YjQzZg==
            [Content-type] => application/json
            [Content-length] => 132
        )

    [body] => {"code":"Niu","grant_type":"authorization_code","redirect_uri":"http:\/\/blahblahblah"}
    [cookies] => Array
        (
        )

)

Some field data has been changed to protect the innocent.

But when I print out the headers received using apache_request_headers() I see everything except the Authentication header.

headers : Array
(
    [Content-Length] => 132
    [Content-Type] => application/json
    [Accept] => */*
    [Accept-Encoding] => deflate, gzip
    [Connection] => close
    [Host] => blhblahblahblah
    [Referer] => https://blahblahblah
    [User-Agent] => WordPress/4.9.2; https://blahblahblah
)