What are the potential reasons for receiving a "400 bad request" error when using cURL in PHP?

The "400 bad request" error typically occurs when the server cannot process the request sent by cURL due to incorrect syntax or missing parameters. To solve this issue, ensure that the cURL request is properly formatted with all necessary headers, data, and options. 

$url = 'https://example.com/api';
$data = array('key1' => 'value1', 'key2' => 'value2');

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

$response = curl_exec($ch);

if($response === false){
    echo 'cURL error: ' . curl_error($ch);
}

curl_close($ch);

Keywords

cURL PHP 400 bad request HTTP headers troubleshooting

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