首先，我通过下面的代码得到了访问令牌

$tokenEndpoint = "https://login.microsoftonline.com/$tenantId/oauth2/token";

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $tokenEndpoint);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$data = array(
    'grant_type' => 'client_credentials',
    'client_id' => $clientId,
    'client_secret' => $clientSecret,
    'resource' => 'https://management.azure.com'
);
$requestBody = http_build_query($data);

curl_setopt($ch, CURLOPT_POSTFIELDS, $requestBody);

$response = curl_exec($ch);

if (curl_errno($ch)) {
    echo 'Error: ' . curl_error($ch);
}

curl_close($ch);

$responseData = json_decode($response, true);
if (isset($responseData['access_token'])) {
   echo $accessToken = $responseData['access_token'];

} else {
    echo "Failed to obtain access token.";
}

然后POST REQUEST Via REST api并传递此访问令牌，代码如下：

$subscriptionId = "c219b0b7-cc1d-4cdb-b323-xxxxxxxxxx";
$resourceGroupName = "maxtv2";
$accountName = "maxtv2";
$assetName = "Plan-Details"; 
 
$url = "https://management.azure.com/subscriptions/{$subscriptionId}/resourceGroups/{$resourceGroupName}/providers/Microsoft.Media/mediaServices/{$accountName}/assets/{$assetName}/files?api-version=2023-01-01"; 

$filePath = "./sample.mp4";

$boundary = uniqid();

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$headers = array(
    "Authorization: Bearer $accessToken",
    "Content-Type: multipart/form-data; boundary=$boundary"
);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$fileContents = file_get_contents($filePath);
$requestBody = "--$boundary\r\n";
$requestBody .= "Content-Disposition: form-data; name=\"file\"; filename=\"" . basename($filePath) . "\"\r\n";
$requestBody .= "Content-Type: video/mp4\r\n\r\n";
$requestBody .= $fileContents . "\r\n";
$requestBody .= "--$boundary--";

curl_setopt($ch, CURLOPT_POSTFIELDS, $requestBody);

$response = curl_exec($ch);

if(curl_errno($ch)){
    echo 'Error: ' . curl_error($ch);
}

curl_close($ch);

echo 'Response: '.$response;

但得到的响应是：{"error "：{" code"："GatewayTimeout"，"message"："网关在指定的时间段内未收到来自'Microsoft. Media'的响应。"}}
如何解决这个问题？？
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