Posting GZipStream to PHP failing to deflate - php

Question

I am trying to post JSON using GZipStream to PHP but am not sure how to deflate it on the PHP side. Here is the function to compress:
public static string Compress( string text) {
var buffer = Encoding.UTF8.GetBytes(text);
var memoryStream = new MemoryStream();
using (var stream = new GZipStream(memoryStream, CompressionMode.Compress, true)) {
stream.Write(buffer, 0, buffer.Length);
}
memoryStream.Position = 0;
var compressed = new byte[memoryStream.Length];
memoryStream.Read(compressed, 0, compressed.Length);
var gZipBuffer = new byte[compressed.Length + 4];
Buffer.BlockCopy(compressed, 0, gZipBuffer, 4, compressed.Length);
Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gZipBuffer, 0, 4);
return Convert.ToBase64String(gZipBuffer);
}
It is being called like this:
request.Headers.Add("Content-Encoding", "gzip");
request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate");
postData = Compress(JsonConvert.SerializeObject(incomingData));
byteArray = Encoding.UTF8.GetBytes(postData);
dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
On the PHP side I am doing this to receive it:
<?PHP
file_put_contents('test.txt', file_get_contents('php://input'));
file_put_contents('test2.txt', gzuncompress('php://input'));
?>
In my apache error log I get this:
PHP Warning: gzdecode(): data error in /var/www/html/gzip.php on line 3
and in test.txt I get this:
0QAAAB+LCAAAAAAABAAdjsEKgzAQRH9lycWLlfbquVLoRWntqelhiYsGZJNuorUU/70htzcPZhj102rAiFrVz4SNiJOWOxwpGa06F+I1OO7dnWQlgQM0myEfrePEvXxB6L1QiNWF4o2CdxxStdTqTBHtHPLMKZs8nvODafNkIg1gJhRMJEBs3MKJkv1MdibwKMHyCCvOC9XQVtBhnKAoSpgtExxL8C7YfOZYabW/dvUHutMCTtEAAAA=
I have also tried gzdecode, gzinflate, what should I do next to get my JSON back so I can process it with PHP?
UPDATE:
I tried doing what Sammitch suggested, but still getting errors. Using this (https://gist.github.com/magnetikonline/650e30e485c0f91f2f40) to dump all the request info provides the following:
POST /gzip.php HTTP/1.1
HTTP headers:
Authorization: Bearer xxxx
Host: mysite.com
Expect: 100-continue
Request body:
0QAAAB+LCAAAAAAABAAdjsEKgzAQRH9lyaUXK/bqWSn0UmntqelhiYsGZJNuorUU/70htzcPZhj102rAiFrVz4StiJMrdzhSMlp1LsRLcNy7O8lKAkdoN0M+WseJe/mC0HuhEMszxRsF7zikaqFVQxHtHPLMKZs8nvODafNkIg1gJhRMJEBs3MKJkv1MdibwKMHyCCvOC9XQlNBhnOBwKGC2TFAV4F2w+UxVarW/dvUHpEHFyNEAAAA=
I tried it both with and without the base64.