http_headers: add Authorization header.

src/http/http_headers.ml

@@ -27,6 +27,7 @@ let accept_charset = name "Accept-Charset"
 let accept_encoding = name "Accept-Encoding"
 let accept_language = name "Accept-Language"
 let accept_ranges = name "Accept-Ranges"
+let authorization = name "Authorization"
 let cache_control = name "Cache-Control"
 let connection = name "Connection"
 let content_disposition = name "Content-Disposition"

src/http/http_headers.mli

@@ -34,6 +34,7 @@ val accept_charset : name
 val accept_encoding : name
 val accept_language : name
 val accept_ranges : name
+val authorization : name
 val cache_control : name
 val connection : name
 val content_disposition : name