Client (grpc-lwt.Grpc

module Rpc : sig ... end

type response_handler = H2.Client_connection.response_handler

type do_request =
  ?flush_headers_immediately:bool ->
  ?trailers_handler:(H2.Headers.t -> unit) ->
  H2.Request.t ->
  response_handler:response_handler ->
  H2.Body.Writer.t

do_request is the type of a function that performs the request

val call : 
  service:string ->
  rpc:string ->
  ?scheme:string ->
  handler:'a Rpc.handler ->
  do_request:do_request ->
  ?headers:H2.Headers.t ->
  unit ->
  ('a * Grpc.Status.t, H2.Status.t) Stdlib.result Lwt.t

call ~service ~rpc ~handler ~do_request () calls the rpc endpoint given by service and rpc using the do_request function. The handler is called when this request is set up to send and receive data.