package dispatch

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Path-based dispatching for client- and server-side applications


Dune Dependency






ocaml-dispatch provides a basic mechanism for dispatching a request to a handler based on hierarchical path names conventionally found in URIs. It can be used both for dispatching requests in a server, as well as handing changes to hierarchical fragments in a client-side application.


Install the library and its depenencies via OPAM:

opam install dispatch


To install development versions of the library, pin the package from the root of the repository:

opam pin add .

You can install the latest changes by commiting them to the local git repository and running:

opam upgrade dispatch

For building and running the tests during development, you will need to install the oUnit package and reconfigure the build process to enable tests:

opam install oUnit
dune runtest


Dispatch is designed to work with whatever sort of handler you care to use, whether it's synchronous, Lwt-based, or Async-based. Here's a simple example of using the Dispatch.DSL module to setup routing for a "Hello, World!" server. The example assumes a Server module and request type, and that handlers should return strings that will be interpreted as the body of the response.

open Dispatch

let hello_handler keys rest request =
  let who = try List.assoc "who" keys with Not_found -> "World" in
  Printf.sprintf "Hello, %s!" who

let handler request =
  let table = [
      "/"           , hello_handler
    ; "/hello/:who/", hello_handler
  ] in
  match DSL.dispatch table request.path with
  | Some handler -> handler request
  | None         -> "Not found!"

let _ =
  Server.start handler


BSD3, see LICENSE file for its text.