RSS-Feed returns an empty string - php

Question

I have a news portal that displays RSS Feeds Items. Approximately 50 sources are read and it works very well.
Only with a source I always get an empty string. The RSS Validator of W3C can read the RSS feed. Even my program Vienna receives data.
What can I do?
Here is my simple code:
$link = 'http://blog.bosch-si.com/feed/';
$response = file_get_contents($link);
if($response !== false) {
var_dump($response);
} else {
echo 'Error ';
}

Answer 1

The server serving that feed expects a User Agent to be set. You apparently don't have a User Agent set in your php.ini, nor do you set it in the call to file_get_contents.
You can either set the User Agent for this particular request through a stream context:
echo file_get_contents(
'http://blog.bosch-si.com/feed/',
FALSE,
stream_context_create(
array(
'http' => array(
'user_agent' => 'php'
)
)
)
);
Or globally for any http calls:
ini_set('user_agent', 'php');
echo file_get_contents($link);
Both will give you the desired result.

Answer 2

blog http://blog.bosch-si.com/feed/ required some header to fetch content from the website, better use curl for the same.
See below solution:
<?php
$link = 'http://blog.bosch-si.com/feed/';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $link);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Host: blog.bosch-si.com', 'User-Agent:Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.80 Safari/537.36'));
$result = curl_exec($ch);
if( ! $result)
{
echo curl_error($ch);
}
curl_close($ch);
echo $result;