Converting JS API request to Powershell

I'm trying to convert some JS code to powershell but getting to a dead end with creating API request. i'm attaching the only part I really can't figure out

var ip  = "127.0.0.1";    

var apiSession = {
  hostname: ip,
  port: 443,
  path: '/api/v1/sessions',
  method: 'POST',
  headers: {
      'Content-Type': 'application/json charset=utf-8',
      'Date': dateFormat(new Date(),"UTC:dddd, dd-mmmm-yy HH:MM:ss Z"),
  }
};
function createSession() {
  var jsonSession = '{"username":"user","password":"pass"}'
  apiSession.headers['Content-MD5'] =  crypto.createHash('md5').update(jsonSession).digest("base64");
  var req = https.request(apiSession, function(res) {   
    res.on('data', function (body) {
      var jsonContent = JSON.parse(body);
      if (jsonContent.hasOwnProperty('id') && jsonContent.hasOwnProperty('accessKey') ){
        console.log("Received session id:"+ jsonContent.id + ", accesskey:"+jsonContent.accessKey)
      }
    });

  });
  req.write(jsonSession);
  req.end();
} 

Until now that's far as I got but I still can't get a connection..

$baseUrl = "https://127.0.0.1"
$requestBody = ConvertTo-Json @{
    username = "user"
    password = "pass"
}
$md5 = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider
$utf8 = New-Object -TypeName System.Text.UTF8Encoding
$hash = [System.BitConverter]::ToString($md5.ComputeHash($utf8.GetBytes($requestBody)))

$requestHeaders = @{
    "Content-Type" = "application/json charset=utf-8"
    "Date"         = get-date -Format "o"
    'Content-MD5'  = $hash
}
$Params = @{
    Method = "POST"
    Uri    = $baseUrl + "/api/v1/sessions"
    Headers = $requestHeaders
    ContentType = "application/json"
}
$session = Invoke-RestMethod @Params
# Get session id & access key
$sessionId = $session.id
$accessKey = $session.accessKey
Write-Host "Your id: $sessionId & Your accsses key: $accessKey"

any point to the right direction would be appreciated

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