Description:
------------
Hello!

I was trying to add gzip/deflate support to standard HTTP streams (code attached). 
It seems stream_context_set_default() works fine as long as stream wrappers are 
not chained, like when used with "compress.zlib://" it will not use options as set 
with this function and will revert to php default ones.

Simas

Test script:
---------------
stream_context_set_default(array(

	'http' => array(
		'protocol_version' => 1.1, // HTTP 1.1 compatible
		'header' => array(
			'Connection: close', // No Keep-Alive
			'Accept-Encoding: gzip, deflate' // We support content compression
		)
	)
));

file_get_contents('compress.zlib://http://example.com');

Expected result:
----------------
Default stream options should be used for chained streams as well.