file_get_contents appends data when downloading a binary file - php

Question

I wrote a function that allows me to send HTTP GET requests in PHP:
function get_HTTPS_page_with_version($url, $hostname, $use_HTTP_1_0 = false, &$headers = NULL, $follow_redirect = true, $use_SSL = true) {
$context = Array(
"http" => Array(
"method" => "GET",
"ignore_errors" => true,
"follow_location" => $follow_redirect,
"user_agent" => "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36",
"header" => "Accept-language: en")
);
if ($use_SSL) {
$context["ssl"] = Array(
"peer_name" => $hostname,
"SNI_server_name" => $hostname,
"verify_peer_name" => false,
"verify_peer" => false);
}
if (!$use_HTTP_1_0) {
$context["http"]["protocol_version"] = "1.1";
$context["http"]["header"] .= "\r\nHost: $hostname".
"\r\nConnection: close";
}
$page = file_get_contents($url, false, stream_context_create($context));
$responseCode = get_HTTP_response_code($http_response_header);
$headers = $http_response_header;
return Array($responseCode, $page);
}
The issue is that when I use this function to get a specific file (which is Verisign Certificate Revocation List), it appends some chars at the beginning:
6639 6361 0a0d --> f9 ca \n\r
and at the end of the file:
0a0d 0d30 0d0a 000a --> \n\r \r0 \r\n NUL\n
I compared files obtained manually using Wget and with this function, and also at network level using Wireshark, and I can confirm that the file sent by the server is the same in both cases.
I also don't have the problem for Thawte CRL
Does anyone have an idea about what might cause this behavior?
EDIT
Verisign CRL changed and other bytes are added by file_get_contents than the ones that I listed above, but the result is still the same --> The file is not the same when downloaded by this function than manually using wget.
EDIT 2
There is no problem when I set $use_HTTP_1_0 = true.
There is no problem when I add header Accept-Encoding: gzip,
deflate (except that I get a gz file and that I'd prefer to avoid
this :))
There is still a problem when I only change Connection from close
to Keep-Alive