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I got problems with this Guzzle, or so I think. My connection gets rejected, and I think missing headers are the cause.

This is the error I receive:

Client error: `GET https://restapi.e-conomic.com/customers` resulted in a `401 Unauthorized` response:
{"message":"Unauthorized access (Unauthorized)."
My code:
$client = new GuzzleHttp\Client(['base_uri' => 'https://restapi.e-conomic.com/']);
$headers = [
    'X-AppSecretToken:demo',
    'X-AgreementGrantToken:demo',
    'Content-Type:application/json; charset=utf-8',
    'debug' => false
$response = $client->request('GET', 'customers', [
    'headers' => $headers
Do you guys know how to check, if headers has been sent, and what they contain? Is there a way to verify if the tokens has been submitted?
Regards,
Kenneth
UPDATE, this works:
$headers = [
    'X-AppSecretToken' => 'demo',
    'X-AgreementGrantToken' => 'demo',
    'Content-Type' => 'application/json; charset=utf-8',
    'debug' => false
$response = $client->request('GET', 'customers', [
    'headers' => $headers
return $response->getBody(); 
                You used wrong format, headers is associative array, so X-AppSecretToken => demo, not X-AppSecretToken:demo
– Mateusz Sip
                Jul 24, 2017 at 5:54
                That was it! Thanks a lot mate - stupid mistake by me. Post an answer, so I can accept it :)
– Kenneth Poulsen
                Jul 24, 2017 at 5:59
        
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