What potential issues could lead to the Error 400 (Bad Request) response when using cURL in PHP?

The Error 400 (Bad Request) response typically occurs when the server cannot process the request sent by cURL due to invalid syntax or missing required parameters. To solve this issue, ensure that the request is properly formatted with all necessary headers, data, and options. 

// Example code snippet to fix Error 400 (Bad Request) response in cURL
$url = 'http://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($response === false) {
    echo 'Error: ' . curl_error($ch);
}

curl_close($ch);

Keywords

cURL PHP Error 400 Bad Request HTTP headers

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