let return_html_error = mk_return_fun pp_error "text/html"
let return_html_internal_error = mk_return_fun pp_internal_error "text/html"
let return_html_msg = mk_return_fun pp_msg "text/html"
let return_html_error = mk_return_fun pp_error "text/html"
let return_html_internal_error = mk_return_fun pp_internal_error "text/html"
let return_html_msg = mk_return_fun pp_msg "text/html"