How to handle 301 redirection of web pages in PHP Curl?

#How to handle 301 redirection of web pages in PHP Curl?

When using PHP Curl to send network requests, you will often encounter the 301 status code returned by the web page, indicating that the page has been permanently redirected. In order to handle this situation correctly, we need to add some specific options and processing logic to the Curl request. The following will introduce in detail how to handle 301 redirection of web pages in PHP Curl and provide specific code examples.

301 redirect processing principle

301 redirect means that the server returns a 301 status code, telling the client that the requested resource has been permanently moved to a new location. When using Curl to send a request, if a 301 status code is encountered, the client needs to send the request again according to the new redirect address to obtain the resource.

PHP Curl handles 301 redirect code example

The following is a simple PHP code example that demonstrates how to use PHP Curl to handle a 301 redirect for a web page:

$url = "http://www.example.com";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

$response = curl_exec($ch);

$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if ($httpCode == 301) {
    $newUrl = curl_getinfo($ch, CURLINFO_REDIRECT_URL);
    curl_setopt($ch, CURLOPT_URL, $newUrl);
    $response = curl_exec($ch);
}

curl_close($ch);

echo $response;

In In the above code, we first set the URL to be requested and initialize a Curl session. Then some Curl options are set, in which the CURLOPT_FOLLOWLOCATION option is set to true, which means that Curl is allowed to automatically follow redirect jumps. After the request is completed, we obtain the HTTP status code. If the status code is 301, we obtain the new redirect address through CURLINFO_REDIRECT_URL and send the request again to obtain the final resource.

Conclusion

Through the above code example, we show how to handle the 301 redirect of a web page in PHP Curl. In actual development, when encountering a 301 redirect, you need to pay attention to processing the new redirect address to ensure that the target resource can be obtained smoothly. I hope this article can help readers better understand and handle 301 redirect situations.

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