CURL函数-即使没有文件也会返回200

<?php
$url = "http://example.com/api";
$ch = curl_init($url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

if ($httpCode == 200) {
    if (empty($response)) {
        echo "Response is empty but status code is 200.";
    } else {
        echo "Response: " . $response;
    }
} else {
    echo "Failed with status code: " . $httpCode;
}

curl_close($ch);
?>

<?php
$url = "http://example.com/api";
$ch = curl_init($url);

curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

if ($httpCode == 200) {
    echo "Resource exists.";
} else {
    echo "Resource does not exist or another error occurred. Status code: " . $httpCode;
}

curl_close($ch);
?>