400 Bad Request for qrs api call

[aguirre]

Hello,

I would like to get app id from app name with QRS api but I am getting this error:

Bad Request HTTP Error 400. The request is badly formed.

I use php code.

If the endpoint is 

$endpoint = "https://mysvr:4242/qrs/about?xrfkey=0123456789abcdef";

or

$endpoint = "https://mysvr:4242/qrs/about/api/description?extended=true&method=GET&format=JSON&xrfkey=0123456789a...";

it works.

But if I try:

$endpoint = "https://mysvr:4242/qrs/app?xrfkey=0123456789abcdef&filter=Name eq 'myAppName'";

I get 

Bad Request

HTTP Error 400. The request is badly formed

Another endpoint with the same error is:

$endpoint = "https://mysvr:4242/qrs/user/count?xrfkey=0123456789abcdef&filter=Name eq 'My Name'";

Do you know what it could be?

Below the rest of my code.

$headers = array(
'Accept: application/json',
'Content-Type: application/json',
'x-qlik-xrfkey:0123456789abcdef',
'Connection:Keep-Alive',
'X-Qlik-User: UserDirectory=Internal;UserId=sa_repository'
);

$url = $endpoint;
$certFile = "c:/inetpub/wwwroot/phpad/cert.pem";
$keyFile = "c:/inetpub/wwwroot/phpad/key.pem";

$request = curl_init();
$options = array(
CURLOPT_URL => $url,
CURLOPT_SSLCERT => $certFile,
CURLOPT_SSLKEY => $keyFile,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_SSL_VERIFYHOST => false,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_HTTPHEADER => $headers,
);
curl_setopt($request, CURLOPT_CUSTOMREQUEST, "GET");
curl_setopt_array($request, $options);
$response = curl_exec($request);

[aguirre · Accepted solution]

I managed. I only need to html encode:

$endpoint = "/app?xrfkey=0123456789abcdef&filter=name+eq+%27myappname%27";