Lighttpd

quote from rfc 2616

       token          = 1*<any CHAR except CTLs or separators>
       separators     = "(" | ")" | "<" | ">" | "@" 
                      | "," | ";" | ":" | "\" | <">
                      | "/" | "[" | "]" | "?" | "=" 
                      | "{" | "}" | SP | HT
       message-header = field-name ":" [ field-value ]
       field-name     = token
       field-value    = *( field-content | LWS )
       field-content  = <the OCTETs making up the field-value
                        and consisting of either *TEXT or combinations
                        of token, separators, and quoted-string>

xx-yy123 should be HTTP_XX_YY123 not HTTP_XX_YY___

-- Xuefer <xuefer