What could be causing the "HTTP request failed" error when using fopen() in PHP?

The "HTTP request failed" error when using fopen() in PHP could be caused by various issues such as incorrect URL, server connectivity problems, or firewall restrictions. To solve this issue, you can try checking the URL for any typos, ensuring that the server is reachable and not blocked by a firewall, and handling potential errors when making the HTTP request. 

$url = 'http://example.com/data.txt';
$handle = fopen($url, 'r');

if ($handle === false) {
    die('Error: Unable to open file.');
}

while (!feof($handle)) {
    $data = fgets($handle);
    echo $data;
}

fclose($handle);

Keywords

HTTP request fopen() error PHP troubleshooting

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