Description:
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PHP under fastcgi is completely missing some function to get all, raw 
header information. There is some function to do that inside the Apache 
SAPI. However i don't see any reason why this is missing in the fastcgi 
SAPI. As PHP modifies the raw headers (User-Agent => USER_AGENT, 
SOAPAction => SOAPACTION etc etc) before putting them into 
$_SERVER["HTTP_XXX"] 
(not to speak of custom headers) there is no safe solution to reproduce 
the Request including HTTP Headers in PHP+fastcgi.

Reproduce code:
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x

Expected result:
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x

Actual result:
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x