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+.. note::
+
+ Metadata keys (the name of the metadata) must be treated as case-insensitive
+ at all times. These keys can contain ASCII 7-bit characters that are not
+ control (0-31) characters, DEL, or a separator character, according to
+ `HTTP/1.1 <http://www.w3.org/Protocols/rfc2616/rfc2616.html>`_ .
+ The underscore character is silently converted to a hyphen.