Hello,
How do I make the header appear on the first page only ?
Thank you
Fabrice

\setuplayout
  [header=2\lineheight,
   headerdistance=\lineheight,
   backspace=2cm,
   width=middle,
   topspace=\lineheight]

\setupbackgrounds[header,state=start][text][frame=off, bottomframe=on,framecolor=gray,rulethickness=2pt]


\setupheader[style=bold]

\setuppagenumbering
    [alternative=,
    location=footer]


\defineframed[headerframed]
             [frame=off,
              location=depth,
              bottomoffset=\lineheight,
              align=middle,
              width=fit]

\setupheadertexts[\headerframed{\ss \sc \bf \red Contrôle n\high{o}\,1 \\ }]
\setupheadertexts[\headerframed{\tfx \ss Lycée JANSON DE SAILLY\\ 31 juillet 2017}][\headerframed{\tfx \ss T\high{le} ES 2 \\ Durée 1 heure 30}]

\starttext
\dorecurse{6}{\input knuth}
\stoptext