Using URL and refer, the content can be parsed on other GET interfaces, but using the following PHP code returns 404

Question

Using URL and refer, the content can be parsed on the online PHP GET interface provided by other websites, and the packet can be captured directly on the web page. However, the following PHP code returns 404. Is this header written wrong?

##<?php

$url='http://interface.yy.com/hls/new/get/54880976/54880976/1200? source=wapyy&callback=jsonp2';

$refer='http://wap.yy.com';

$opt=array('http'=>array('header' =>"Referer: $refer"));

$context=stream_context_create($opt);

$html = file_get_contents($url,false, $context);

echo '<br>The following is the parsed content:';

echo '<br>';

echo $html;

?>

Answer 1

404 should be that there is a problem with the parameters in file_get_contents and the relevant page is not obtained