Fetch JSON response from API using php - php

Question

I'm trying to fetch data from API, but no data returns.
I try the API request in postman and it's working but in my php code nothing gets returned.
$uri = 'https://example.com';
$opts = array(
'http' => array(
'method'=>'POST',
'header'=>'Content-Type: application/x-www-form-urlencoded',
)
);
$context = stream_context_create($opts);
$result = file_get_contents($uri, false, $context);
print $result;
or using curl
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => 'https://example.com',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => 'POST',
));
$response = curl_exec($curl);
curl_close($curl);
echo $response;
the error is
file_get_contents(https://example.com): failed to open stream: HTTP request failed! HTTP/1.1 411 Length Required
Note: the response size in postman is 9.83, is this maybe an issue?

Answer 1

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"http://www.example.com/tester.phtml");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
"postvar1=value1&postvar2=value2&postvar3=value3");
// In real life you should use something like:
// curl_setopt($ch, CURLOPT_POSTFIELDS,
// http_build_query(array('postvar1' => 'value1')));
// Receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$server_output = curl_exec($ch);
curl_close ($ch);
// Further processing ...
if ($server_output == "OK") { ... } else { ... }

Answer 2

The issue has been solved by add Content-Length: 0 in the header