How to Catch Curl Errors in PHP

How to catch cURL errors in PHP

You can use the curl_error() function to detect if there was some error. For example:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $your_url);
curl_setopt($ch, CURLOPT_FAILONERROR, true); // Required for HTTP error codes to be reported via our call to curl_error($ch)
//...
curl_exec($ch);
if (curl_errno($ch)) {
    $error_msg = curl_error($ch);
}
curl_close($ch);

if (isset($error_msg)) {
    // TODO - Handle cURL error accordingly
}

See the description of libcurl error codes here

See the description of PHP curl_errno() function here

See the description of PHP curl_error() function here

Not getting any error message or content from cURL

Per the curl_exec() documentation:

Returns TRUE on success or FALSE on failure. However, if the CURLOPT_RETURNTRANSFER option is set, it will return the result on success, FALSE on failure.

Your call to var_dump($content); is showing bool(false), which means curl_exec() is failing. That is why you are not getting any response content. Use curl_errno() and/or curl_error() to find out why it is failing.

One thing I do notice is curl_getinfo() is reporting [redirect_count] => 20. That is a lot of redirects. The server is likely getting stuck in an endless redirect loop and curl_exec() decides to fail after awhile. See CURLOPT_MAXREDIRS. Check if the error number being reported is CURLE_TOO_MANY_REDIRECTS.

Catching cURL errors with PHP/Laravel

Figured it out. Guzzle has its own error handling for requests.

Source: http://docs.guzzlephp.org/en/stable/quickstart.html#exceptions

Solution:

use GuzzleHttp\Exception\RequestException;

...

try {
    $crawler = $goutteClient->request('GET', 'https://www.google.com');
    $crawlerError = false;
} catch (RequestException $e) {
    $crawlerError = true;
}


if ($crawlerError == true) {
    do the thing
} else {
   do the other thing
}

Curl is working however error with php CURL

To avoid «500 error» (for example) be sure to:

set proper "Referer: " header if needed, with

curl_setopt(CURLOPT_REFERER, 'ref page');

set proper "User-Agent: " header, with

curl_setopt(CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)');

PHP curl: check response for error before saving to file

Do a curl_getinfo() before writing to the file (and don't open it in the beginning of the code).

Example:

$ch = curl_init('http://www.google.com/');
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$c = curl_exec($ch);

if(curl_getinfo($ch, CURLINFO_HTTP_CODE) != 200)
    echo "Something went wrong!";

Any response code not 200 (success) is considered an error, the code above will most likely not return anything as google.com is up and online ;)

Laravel - Correct way to catch cURL exceception

Unlike Guzzle, Laravel's HttpClient does not throw errors if the response is > 400.

You should simply use an if statement to check the response status code. See: https://laravel.com/docs/8.x/http-client#error-handling

You can call use the following checks:

// Determine if the status code is >= 200 and < 300...
$response->successful();

// Determine if the status code is >= 400...
$response->failed();

// Determine if the response has a 400 level status code...
$response->clientError();

// Determine if the response has a 500 level status code...
$response->serverError();

So in your case you can simply do something like this:

$response = Http::timeout(2)->asForm()->post('https://' . $this->ip_address, [
    'username' => $this->username,
    'password' => $this->password
]);

if ($response->failed()) {
    return view('your-view')->with([
        'message' => 'Failed.',
    ]);
}

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