Zero-allocation HTTP/1.1 for OxCaml

# Verify you have OCaml 5.2+ with OxCaml support
ocaml --version

opam install httpz

(executable
 (name my_server)
 (libraries httpz async))

open Httpz

let parse_request socket_data =
  let buf = Httpz.create_buffer () in
  (* Read data into buffer *)
  let len = read_socket_into buf socket_data in
  
  (* Parse with zero heap allocations *)
  let #(status, req, headers) = 
    Httpz.parse buf ~len ~limits:Httpz.default_limits 
  in
  
  match status with
  | Buf_read.Complete ->
    (* All values are stack-allocated *)
    Printf.printf "Method: %s\n" (Method.to_string req.#meth);
    Printf.printf "Target: %s\n" (Span.to_string buf req.#target);
    List.iter (fun hdr ->
      Printf.printf "Header: %s\n" 
        (Header_name.canonical hdr.Header.name)
    ) headers
  | _ -> 
    Printf.eprintf "Parse failed\n"

# Serve current directory on port 8080
dune exec bin/httpz_server.exe

# Custom directory and port
dune exec bin/httpz_server.exe -- -d /var/www -p 3000