CODEWITHSUNDEEP
phpfacebookfacebook-messengerfacebook-messenger-bot
grptx
grptx

Reputation: 334

Empty message from facebook messenger bot

I followed the guide to build a facebook messenger bot from here

but in my software I receive alway an empty response.

here my bot code:



    define('PAGE_TOKEN',"xxx");
    define('VERIFY_TOKEN',"xxx");

    if(isset($_GET['hub_mode']) && isset($_GET['hub_challenge']) && isset($_GET['hub_verify_token'])) {
        if($_GET['hub_verify_token']==VERIFY_TOKEN && $_GET['hub_mode']=='subscribe') {
            echo $_GET['hub_challenge'];
        }
    }

    $input = json_decode(file_get_contents('php://input'), true);
    // Get the Senders Graph ID
    $sender = $input['entry'][0]['messaging'][0]['sender']['id'];
    // Get the returned message
    $message = $input['entry'][0]['messaging'][0]['message']['text'];

    error_log($input);
    error_log($sender);
    error_log($message);

the verify phase is fine, but when i send a messagge to my bot in my error_log file I found only empty values:



    [Sun Aug 13 17:35:49.617919 2017] [:error] [pid 22501] [client 173.252.124.11:18834]
    [Sun Aug 13 17:35:49.617951 2017] [:error] [pid 22501] [client 173.252.124.11:18834]
    [Sun Aug 13 17:35:49.617972 2017] [:error] [pid 22501] [client 173.252.124.11:18834]

Here there is also my access_log:



    173.252.124.30 - - [13/Aug/2017:17:35:48 +0200] "POST /webhook HTTP/1.1" 301 3621 "-" "-"
    173.252.124.11 - - [13/Aug/2017:17:35:49 +0200] "GET /webhook/ HTTP/1.1" 200 328 "-" "-"

so why the $input variable is alway empty?

Upvotes: 3

Views: 959

Answers (1)

C3roe
C3roe

Reputation: 96326

173.252.124.30 - - [13/Aug/2017:17:35:48 +0200] "POST /webhook HTTP/1.1" 301 3621 "-" "-"
173.252.124.11 - - [13/Aug/2017:17:35:49 +0200] "GET /webhook/ HTTP/1.1" 200 328 "-" "-"

Your server answers the POST request with a 301 redirect, so that the client (Facebook) has to make a GET request next, and therefor you see no more POST data.

Seeing that the first URL is /webhook, and gets redirected to /webhook/, this is likely just an automatic trailing slash redirect, and should be fixed once you specify the correct URL with the trailing slash in your app settings to begin with.

Upvotes: 4

Related Questions