api-ref/source/metadata_header_encoding.inc


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.. note::

    The metadata value must be UTF-8-encoded and then
    URL-encoded before you include it in the header.
    This is a direct violation of the HTTP/1.1 `basic rules
    <http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2>`_.