add http headers to the camera setup

[unglazedstamp]

based on #24

[gruvw]

Could we merge this ?

[violoncelloCH]

ohh this is where that commit got lost - it has been on a separate but unmerged branch :upside_down_face: it looks basically equivalent to what I've reimplemented today. it just needs a rebase + resolution of conflicts. (cc @unglazedstamp )

[unglazedstamp]

I will look into it