在后端通过AJAX无法通过POST获取变量，而在前端完全可以

Question

Ok, so, here is my problem. I'm trying to send tag attribute which I store in javascript variable to backend(PHP) via AJAX.

$.ajax({
    type: "POST",
    url: '/requests/mercury.php',
    data: {url : $(this).data('link')},
    success: function(data){
       console.log(data);
    }

It's a URL which I want to pass to CURL request.

CURL request is working if I write correct URL manually, but by some reason I can't retrieve variable at backend. I've tried debugging and it seems like I'm getting an empty array and I don't know why.

$link = $_POST['url'];

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "https://mercury.postlight.com/parser?url=".$link);

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    "x-api-key: AU5zjyEqyL0LgR8zkb4Iurhlenpn52bGtbiqJA4t",
));

$x = curl_exec($ch);

curl_close($ch);

Tried to deploy at localhost(MAMP) and Heroku, at both places same problem.

Full code is avalible at https://github.com/pjotrleshkin/RSSParsing

Answer 1

Hi Pjotr Leškin there was an issue on HTTP request Methods. On your index.php the Ajax code is working fine because you are sending POST request but on link click you are opening /requests/mercury.php that is a GET request. So, to get the parameter on load of /requests/mercury.php you need $_GET['url'] and need to pass query string along with url. I have made little change on your code to handle both GET and POST request.

echo "<a href='requests/mercury.php' data-link = ".$item->link." target='_blank'>";

to

echo "<a href='requests/mercury.php?url={$item->link}' data-link = ".$item->link." target='_blank'>";

and

$link = $_POST['url'];

to

$link = "";

if (isset($_POST['title'])) {
    $link = $_POST['url'];
} else  {
    $link = $_GET['url'];
}

And I have created a pull request on your github code. Hope this will help you.