fix: receive authorization header independent of lower or upper case #2707
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According to RFC 7230 "Each header field consists of a case-insensitive field name followed by a colon (":"), optional leading whitespace, the field value, and optional trailing whitespace." HTTP Headers should be treated case insensitive.
The PHP function apache_request_headers() is case sensitive. Imho, we should patch the lib.php in order to set variable $authtoken independent of case sensitivity.
It fixes the issue #2688