LinkedIn API file_get_contents timing out - php

Question

I currently use file_get_contents() to call the LinkedIn Authentication API.
I successful call /uas/oauth2/authorization but when I call /uas/oauth2/accessToken with file_get_contents() it times out.
The odd thing is that it works perfectly on my localhost.
I've made sure allow_url_fopen is on and manage to open google.com with file_get_contents().
As you can probably imagine, it's driving me crazy trying to debug it (and fix it).
Do any of you have any suggestions on why this is the case?

Answer 1

The issue is because /uas/oauth2/accessToken requires a POST type method, file_get_contents always uses GET. Consider switching to curl, method for both of your calls are provided below.
This information is available within the documentation
Variables for both calls
$apiKey = '';
$state = '';
$scope = '';
$redirectUri = '';
/uas/oauth2/authorization
$postData = http_build_query(
[
'response_type' => 'code',
'client_id' => $apiKey,
'scope' => $scope
'state' => $state,
'redirect_uri' => $redirectUri
]
);
$ch = curl_init();
$endpoint = sprintf('%s?%s', 'https://www.linkedin.com/uas/oauth2/authorization', $postData);
curl_setopt($ch, CURLOPT_URL, $endpoint);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 10);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FAILONERROR, false);
curl_setopt($ch, CURLOPT_TIMEOUT, 15);
$response = curl_exec($ch);
/uas/oauth2/accessToken
$postData = http_build_query(
[
'grant_type' => 'authorization_code',
'client_id' => $apiKey,
'scope' => $scope
'state' => $state,
'redirect_uri' => $redirectUri
]
);
$ch = curl_init();
$endpoint = 'https://www.linkedin.com/uas/oauth2/accessToken';
curl_setopt($ch, CURLOPT_URL, $endpoint);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 10);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FAILONERROR, false);
curl_setopt($ch, CURLOPT_TIMEOUT, 15);
$response = curl_exec($ch);