Subscribe using Superfeedr PubSubHubbub generating error hub.topic not found - php

Question

I want to integrate Superfeedr API using PubSubHubbub in PHP. I am following this and my code is:
<?php
require_once('Superfeedr.class.php')
$superfeedr = new Superfeedr('http://push-pub.appspot.com/feed',
'http://mycallback.tld/push?feed=http%3A%2F%2Fpush-pub.appspot.com%2Ffeed',
'http://wallabee.superfeedr.com');
$superfeedr->verbose = true;
$superfeedr->subscribe();
?>
And my subscribe() function is
public function subscribe()
{
$this->request('subscribe');
}
private function request($mode)
{
$data = array();
$data['topic'] = $this->topic;
$data['callback'] = $this->callback;
$post_data = array (
"hub.mode" => 'subscribe',
"hub.verify" => "sync",
"hub.callback" => urlencode($this->callback),
"hub.topic" => urlencode($this->topic),
"hub.verify_token" => "26550615cbbed86df28847cec06d3769",
);
//echo "<pre>"; print_r($post_data); exit;
// url-ify the data for the POST
foreach ($post_data as $key=>$value) {
$post_data_string .= $key.'='. $value.'&';
}
rtrim($fields_string,'&');
// curl request
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $this->hub);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/json'));
curl_setopt($ch, CURLOPT_USERPWD, 'USERNAME:PASSWORD');
$output = curl_exec($ch);
if ($this->verbose) {
print('<pre>');
print_r($output);
print('</pre>');
}
}
But after execution I am getting this error
HTTP/1.1 422 Unprocessable Entity
X-Powered-By: The force, Luke
Vary: X-HTTP-Method-Override, Accept-Encoding
Content-Type: text/plain; charset=utf-8
X-Superfeedr-Host: supernoder16.superfeedr.com
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
Access-Control-Allow-Methods: GET, POST, PUT, DELETE
Access-Control-Allow-Headers: Authorization
Content-Length: 97
ETag: W/"61-db6269b5"
Date: Wed, 24 Aug 2016 14:01:47 GMT
Connection: close
Please provide a valid hub.topic (feed) URL that is accepted on this hub. The hub does not match.
Same data (topic and callback etc..) requesting from https://superfeedr.com/users/testdata/push_console
is working fine. But I don't know why I am getting this error on my local. If anyone has any experienced with same problom then please help me. Thanks.

Answer 1

You are using a strange hub URL. You should use HTTPS://push.superfeedr.com in the last param of your class constructor.