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Merge pull request 'Add .gitignore and .ocamlformat' (#1) from ocamlformat into main

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Reviewed-on: https://git.robur.io/robur/http-mirage-client/pulls/1
This commit is contained in:
dinosaure 2022-10-19 10:27:01 +00:00
commit 5fe7693c52
4 changed files with 270 additions and 179 deletions
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11
.gitignore vendored Normal file
View file

@ -0,0 +1,11 @@
_build
setup.data
setup.log
doc/*.html
*.native
*.byte
*.so
*.tar.gz
_tests
*.merlin
*.install

17
.ocamlformat Normal file
View file

@ -0,0 +1,17 @@
version=0.23.0
profile=conventional
break-struct=natural
break-infix=fit-or-vertical
break-sequences=false
break-collection-expressions=wrap
break-separators=before
exp-grouping=preserve
parens-tuple=multi-line-only
space-around-lists=false
space-around-records=false
space-around-arrays=false
break-fun-decl=smart
cases-exp-indent=2
sequence-style=before
field-space=tight
break-before-in=auto

382
src/http_mirage_client.ml
View file

@ -5,10 +5,11 @@ let tls_config = Mimic.make ~name:"tls-config"
open Lwt.Infix
type t =
{ ctx : Mimic.ctx
; alpn_protocol : Mimic.flow -> string option
; authenticator : (X509.Authenticator.t, [ `Msg of string ]) result }
type t = {
ctx: Mimic.ctx
; alpn_protocol: Mimic.flow -> string option
; authenticator: (X509.Authenticator.t, [ `Msg of string ]) result
}
module type S = sig
type nonrec t = t
@ -17,16 +18,20 @@ module type S = sig
end
module Make
(Pclock : Mirage_clock.PCLOCK)
(TCP : Tcpip.Tcp.S)
(Happy_eyeballs : Mimic_happy_eyeballs.S with type flow = TCP.flow) : S = struct
(Pclock : Mirage_clock.PCLOCK)
(TCP : Tcpip.Tcp.S)
(Happy_eyeballs : Mimic_happy_eyeballs.S with type flow = TCP.flow) : S =
struct
type nonrec t = t
module TCP = struct
include TCP
type endpoint = Happy_eyeballs.t * string * int
type nonrec write_error =
[ `Write of write_error | `Connect of string | `Closed ]
let pp_write_error ppf = function
| `Connect err -> Fmt.string ppf err
| `Write err -> pp_write_error ppf err
@ -44,7 +49,7 @@ module Make
| Error err -> Lwt.return_error (`Write err)
let connect (happy_eyeballs, hostname, port) =
Happy_eyeballs.resolve happy_eyeballs hostname [ port ] >>= function
Happy_eyeballs.resolve happy_eyeballs hostname [port] >>= function
| Error (`Msg err) -> Lwt.return_error (`Connect err)
| Ok ((_ipaddr, _port), flow) -> Lwt.return_ok flow
end
@ -58,22 +63,23 @@ module Make
let connect (happy_eyeballs, cfg, hostname, port) =
let peer_name =
Result.(to_option (bind (Domain_name.of_string hostname) Domain_name.host)) in
Happy_eyeballs.resolve happy_eyeballs hostname [ port ] >>= function
Result.(
to_option (bind (Domain_name.of_string hostname) Domain_name.host))
in
Happy_eyeballs.resolve happy_eyeballs hostname [port] >>= function
| Ok ((_ipaddr, _port), flow) -> client_of_flow cfg ?host:peer_name flow
| Error (`Msg err) -> Lwt.return_error (`Write (`Connect err))
end
let tls_edn, tls_protocol =
Mimic.register ~name:"tls" (module TLS)
let tls_edn, tls_protocol = Mimic.register ~name:"tls" (module TLS)
let alpn_protocol flow =
let module M = (val (Mimic.repr tls_protocol)) in
let module M = (val Mimic.repr tls_protocol) in
match flow with
| M.T flow ->
( match TLS.epoch flow with
| Ok { Tls.Core.alpn_protocol; _ } -> alpn_protocol
| Error _ -> None )
| M.T flow -> (
match TLS.epoch flow with
| Ok {Tls.Core.alpn_protocol; _} -> alpn_protocol
| Error _ -> None)
| _ -> None
let authenticator =
@ -81,37 +87,50 @@ module Make
V.authenticator ()
let connect ctx =
let k0 happy_eyeballs http_scheme http_hostname http_port = match http_scheme with
let k0 happy_eyeballs http_scheme http_hostname http_port =
match http_scheme with
| "http" -> Lwt.return_some (happy_eyeballs, http_hostname, http_port)
| _ -> Lwt.return_none in
let k1 happy_eyeballs http_scheme http_hostname http_port tls_config = match http_scheme with
| "https" -> Lwt.return_some (happy_eyeballs, tls_config, http_hostname, http_port)
| _ -> Lwt.return_none in
let ctx = Mimic.fold tcp_edn
Mimic.Fun.[ req Happy_eyeballs.happy_eyeballs
; req http_scheme; req http_hostname; dft http_port 80 ]
~k:k0 ctx in
let ctx = Mimic.fold tls_edn
Mimic.Fun.[ req Happy_eyeballs.happy_eyeballs
; req http_scheme; req http_hostname; dft http_port 443
; req tls_config ]
~k:k1 ctx in
Lwt.return { ctx; alpn_protocol; authenticator; }
| _ -> Lwt.return_none in
let k1 happy_eyeballs http_scheme http_hostname http_port tls_config =
match http_scheme with
| "https" ->
Lwt.return_some (happy_eyeballs, tls_config, http_hostname, http_port)
| _ -> Lwt.return_none in
let ctx =
Mimic.fold tcp_edn
Mimic.Fun.
[
req Happy_eyeballs.happy_eyeballs; req http_scheme; req http_hostname
; dft http_port 80
]
~k:k0 ctx in
let ctx =
Mimic.fold tls_edn
Mimic.Fun.
[
req Happy_eyeballs.happy_eyeballs; req http_scheme; req http_hostname
; dft http_port 443; req tls_config
]
~k:k1 ctx in
Lwt.return {ctx; alpn_protocol; authenticator}
end
module Version = Httpaf.Version
module Status = H2.Status
module Headers = H2.Headers
type response =
{ version : Version.t
; status : Status.t
; reason : string
; headers : Headers.t }
type response = {
version: Version.t
; status: Status.t
; reason: string
; headers: Headers.t
}
module HTTP_1_1 = struct
include Httpaf.Client_connection
let yield_reader _ = assert false
let next_read_operation t =
(next_read_operation t :> [ `Close | `Read | `Yield ])
end
@ -125,10 +144,11 @@ let add_authentication ~add headers = function
let prepare_http_1_1_headers headers host user_pass body_length =
let headers = Httpaf.Headers.of_list headers in
let add = Httpaf.Headers.add_unless_exists in
let headers = add headers "user-agent" ("http-mirage-client/%%VERSION%%") in
let headers = add headers "user-agent" "http-mirage-client/%%VERSION%%" in
let headers = add headers "host" host in
let headers = add headers "connection" "close" in
let headers = match body_length with
let headers =
match body_length with
| None -> headers
| Some v -> add headers "content-length" (string_of_int v) in
add_authentication ~add headers user_pass
@ -138,123 +158,157 @@ let single_http_1_1_request ?config flow user_pass host meth path headers body =
let headers = prepare_http_1_1_headers headers host user_pass body_length in
let req = Httpaf.Request.create ~headers meth path in
let finished, notify_finished = Lwt.wait () in
let wakeup = let w = ref false in
fun v -> if not !w then Lwt.wakeup_later notify_finished v ; w := true in
let wakeup =
let w = ref false in
fun v ->
if not !w then Lwt.wakeup_later notify_finished v
; w := true in
let response_handler response body =
let buf = Buffer.create 0x100 in
let rec on_eof () =
let response =
{ version= response.Httpaf.Response.version
; status = (response.Httpaf.Response.status :> H2.Status.t)
; reason = response.Httpaf.Response.reason
; headers= H2.Headers.of_list (Httpaf.Headers.to_list response.Httpaf.Response.headers) } in
{
version= response.Httpaf.Response.version
; status= (response.Httpaf.Response.status :> H2.Status.t)
; reason= response.Httpaf.Response.reason
; headers=
H2.Headers.of_list
(Httpaf.Headers.to_list response.Httpaf.Response.headers)
} in
wakeup (Ok (response, Some (Buffer.contents buf)))
and on_read ba ~off ~len =
Buffer.add_string buf (Bigstringaf.substring ~off ~len ba) ;
Httpaf.Body.schedule_read body ~on_read ~on_eof in
Buffer.add_string buf (Bigstringaf.substring ~off ~len ba)
; Httpaf.Body.schedule_read body ~on_read ~on_eof in
let on_eof () =
let response =
{ version= response.Httpaf.Response.version
; status = (response.Httpaf.Response.status :> H2.Status.t)
; reason = response.Httpaf.Response.reason
; headers= H2.Headers.of_list (Httpaf.Headers.to_list response.Httpaf.Response.headers) } in
{
version= response.Httpaf.Response.version
; status= (response.Httpaf.Response.status :> H2.Status.t)
; reason= response.Httpaf.Response.reason
; headers=
H2.Headers.of_list
(Httpaf.Headers.to_list response.Httpaf.Response.headers)
} in
wakeup (Ok (response, None)) in
Httpaf.Body.schedule_read body ~on_read ~on_eof in
let error_handler e =
let err = match e with
let err =
match e with
| `Malformed_response x -> Error (`Msg ("Malformed response: " ^ x))
| `Invalid_response_body_length _ -> Error (`Msg ("Invalid response body length"))
| `Invalid_response_body_length _ ->
Error (`Msg "Invalid response body length")
| `Exn e -> Error (`Msg ("Exception here: " ^ Printexc.to_string e)) in
wakeup err in
let request_body, conn = Httpaf.Client_connection.request ?config req ~error_handler
~response_handler in
Lwt.async (fun () -> Paf.run (module HTTP_1_1) conn flow) ;
Option.iter (Httpaf.Body.write_string request_body) body ;
Httpaf.Body.close_writer request_body ;
finished
let request_body, conn =
Httpaf.Client_connection.request ?config req ~error_handler
~response_handler in
Lwt.async (fun () -> Paf.run (module HTTP_1_1) conn flow)
; Option.iter (Httpaf.Body.write_string request_body) body
; Httpaf.Body.close_writer request_body
; finished
let prepare_h2_headers headers host user_pass body_length =
let headers = H2.Headers.of_list headers in
let add hdr = H2.Headers.add_unless_exists hdr ?sensitive:None in
let headers = add headers ":authority" host in
let headers = add headers "content-length" (string_of_int (Option.value ~default:0 body_length)) in
let headers =
add headers "content-length"
(string_of_int (Option.value ~default:0 body_length)) in
add_authentication ~add headers user_pass
let single_h2_request ?config ~scheme flow user_pass host meth path headers body =
let single_h2_request ?config ~scheme flow user_pass host meth path headers body
=
let body_length = Option.map String.length body in
let headers = prepare_h2_headers headers host user_pass body_length in
let req = H2.Request.create ~scheme ~headers meth path in
let finished, notify_finished = Lwt.wait () in
let wakeup = let w = ref false in
fun v -> if not !w then Lwt.wakeup_later notify_finished v ; w := true in
let wakeup =
let w = ref false in
fun v ->
if not !w then Lwt.wakeup_later notify_finished v
; w := true in
let response_handler response response_body =
let buf = Buffer.create 0x100 in
let rec on_eof () =
let response =
{ version= { major= 2; minor= 0; }
; status = response.H2.Response.status
; reason = ""
; headers= response.H2.Response.headers } in
{
version= {major= 2; minor= 0}
; status= response.H2.Response.status
; reason= ""
; headers= response.H2.Response.headers
} in
wakeup (Ok (response, Some (Buffer.contents buf)))
and on_read ba ~off ~len =
Buffer.add_string buf (Bigstringaf.substring ~off ~len ba) ;
H2.Body.Reader.schedule_read response_body
~on_read ~on_eof in
Buffer.add_string buf (Bigstringaf.substring ~off ~len ba)
; H2.Body.Reader.schedule_read response_body ~on_read ~on_eof in
let on_eof () =
let response =
{ version= { major= 2; minor= 0; }
; status = response.H2.Response.status
; reason = ""
; headers= response.H2.Response.headers } in
{
version= {major= 2; minor= 0}
; status= response.H2.Response.status
; reason= ""
; headers= response.H2.Response.headers
} in
wakeup (Ok (response, None)) in
H2.Body.Reader.schedule_read response_body
~on_read ~on_eof in
H2.Body.Reader.schedule_read response_body ~on_read ~on_eof in
let error_handler e =
let err = match e with
let err =
match e with
| `Malformed_response x -> Error (`Msg ("Malformed response: " ^ x))
| `Invalid_response_body_length _ -> Error (`Msg "Invalid response body length")
| `Invalid_response_body_length _ ->
Error (`Msg "Invalid response body length")
| `Protocol_error (err, msg) ->
let kerr _ = Error (`Msg (Format.flush_str_formatter ())) in
Format.kfprintf kerr Format.str_formatter "%a: %s" H2.Error_code.pp_hum err msg
Format.kfprintf kerr Format.str_formatter "%a: %s" H2.Error_code.pp_hum
err msg
| `Exn e -> Error (`Msg ("Exception here: " ^ Printexc.to_string e)) in
wakeup err in
let conn = H2.Client_connection.create ?config ?push_handler:None
~error_handler in
let request_body = H2.Client_connection.request conn req ~error_handler ~response_handler in
Lwt.async (fun () -> Paf.run (module H2.Client_connection) conn flow) ;
Option.iter (H2.Body.Writer.write_string request_body) body ;
H2.Body.Writer.close request_body ;
finished >|= fun v ->
H2.Client_connection.shutdown conn ;
v
let conn =
H2.Client_connection.create ?config ?push_handler:None ~error_handler in
let request_body =
H2.Client_connection.request conn req ~error_handler ~response_handler in
Lwt.async (fun () -> Paf.run (module H2.Client_connection) conn flow)
; Option.iter (H2.Body.Writer.write_string request_body) body
; H2.Body.Writer.close request_body
; finished >|= fun v ->
H2.Client_connection.shutdown conn
; v
let decode_uri ~ctx uri =
let ( >>= ) = Result.bind in
match String.split_on_char '/' uri with
| proto :: "" :: user_pass_host_port :: path ->
( if String.equal proto "http:"
then Ok ("http", Mimic.add http_scheme "http" ctx)
else if String.equal proto "https:"
then Ok ("https", Mimic.add http_scheme "https" ctx)
else Error (`Msg "Couldn't decode user and password") ) >>= fun (scheme, ctx) ->
let decode_user_pass up = match String.split_on_char ':' up with
| [ user; pass; ] -> Ok (user, pass)
(if String.equal proto "http:" then
Ok ("http", Mimic.add http_scheme "http" ctx)
else if String.equal proto "https:" then
Ok ("https", Mimic.add http_scheme "https" ctx)
else Error (`Msg "Couldn't decode user and password"))
>>= fun (scheme, ctx) ->
let decode_user_pass up =
match String.split_on_char ':' up with
| [user; pass] -> Ok (user, pass)
| _ -> Error (`Msg "Couldn't decode user and password") in
( match String.split_on_char '@' user_pass_host_port with
| [ host_port ] -> Ok (None, host_port)
| [ user_pass; host_port ] ->
decode_user_pass user_pass >>= fun up ->
Ok (Some up, host_port)
| _ -> Error (`Msg "Couldn't decode URI") ) >>= fun (user_pass, host_port) ->
( match String.split_on_char ':' host_port with
(match String.split_on_char '@' user_pass_host_port with
| [host_port] -> Ok (None, host_port)
| [user_pass; host_port] ->
decode_user_pass user_pass >>= fun up -> Ok (Some up, host_port)
| _ -> Error (`Msg "Couldn't decode URI"))
>>= fun (user_pass, host_port) ->
(match String.split_on_char ':' host_port with
| [] -> Error (`Msg "Empty host & port")
| [ hostname ] -> Ok (hostname, Mimic.add http_hostname hostname ctx)
| hd :: tl ->
let port, hostname = match List.rev (hd :: tl) with
| [hostname] -> Ok (hostname, Mimic.add http_hostname hostname ctx)
| hd :: tl -> (
let port, hostname =
match List.rev (hd :: tl) with
| hd :: tl -> hd, String.concat ":" (List.rev tl)
| _ -> assert false in
( try Ok (hostname, Mimic.add http_hostname hostname (Mimic.add http_port (int_of_string port) ctx))
with Failure _ -> Error (`Msg "Couldn't decode port") ) ) >>= fun (hostname, ctx) ->
try
Ok
( hostname
, Mimic.add http_hostname hostname
(Mimic.add http_port (int_of_string port) ctx) )
with Failure _ -> Error (`Msg "Couldn't decode port")))
>>= fun (hostname, ctx) ->
Ok (ctx, scheme, hostname, user_pass, "/" ^ String.concat "/" path)
| _ -> Error (`Msg "Couldn't decode URI on top")
@ -266,43 +320,49 @@ let alpn_protocol_of_string = function
| _ -> None
let single_request ~ctx ~alpn_protocol ?config cfg ~meth ~headers ?body uri =
Lwt.return (decode_uri ~ctx uri) >>? fun (ctx, scheme, host, user_pass, path) ->
let ctx = match Lazy.force cfg with
Lwt.return (decode_uri ~ctx uri)
>>? fun (ctx, scheme, host, user_pass, path) ->
let ctx =
match Lazy.force cfg with
| Ok (`Custom cfg) -> Mimic.add tls_config cfg ctx
| Ok (`Default cfg) ->
( match Result.bind (Domain_name.of_string host) Domain_name.host with
| Ok (`Default cfg) -> (
match Result.bind (Domain_name.of_string host) Domain_name.host with
| Ok peer -> Mimic.add tls_config (Tls.Config.peer cfg peer) ctx
| Error _ -> Mimic.add tls_config cfg ctx )
| Error _ -> Mimic.add tls_config cfg ctx)
| Error _ -> ctx in
Mimic.resolve ctx >>? fun flow ->
(match Option.bind (alpn_protocol flow) alpn_protocol_of_string, config with
| (Some `HTTP_1_1 | None), Some (`HTTP_1_1 config) ->
single_http_1_1_request ~config flow user_pass host meth path headers body
| (Some `HTTP_1_1 | None), None ->
single_http_1_1_request flow user_pass host meth path headers body
| (Some `H2 | None), Some (`H2 config) ->
single_h2_request ~config ~scheme flow user_pass host meth path headers body
| Some `H2, None ->
single_h2_request ~scheme flow user_pass host meth path headers body
| Some `H2, (Some (`HTTP_1_1 _)) ->
single_h2_request ~scheme flow user_pass host meth path headers body
| Some `HTTP_1_1, Some (`H2 _) ->
single_http_1_1_request flow user_pass host meth path headers body) >>= fun r ->
Mimic.close flow >|= fun () ->
r
| (Some `HTTP_1_1 | None), Some (`HTTP_1_1 config) ->
single_http_1_1_request ~config flow user_pass host meth path headers body
| (Some `HTTP_1_1 | None), None ->
single_http_1_1_request flow user_pass host meth path headers body
| (Some `H2 | None), Some (`H2 config) ->
single_h2_request ~config ~scheme flow user_pass host meth path headers body
| Some `H2, None ->
single_h2_request ~scheme flow user_pass host meth path headers body
| Some `H2, Some (`HTTP_1_1 _) ->
single_h2_request ~scheme flow user_pass host meth path headers body
| Some `HTTP_1_1, Some (`H2 _) ->
single_http_1_1_request flow user_pass host meth path headers body)
>>= fun r ->
Mimic.close flow >|= fun () -> r
let tls_config ?tls_config ?config authenticator user's_authenticator =
lazy ( match tls_config with
| Some cfg -> Ok (`Custom cfg)
| None ->
let alpn_protocols = match config with
| None -> [ "h2"; "http/1.1" ]
| Some (`H2 _) -> [ "h2" ]
| Some (`HTTP_1_1 _) -> [ "http/1.1" ] in
match authenticator, user's_authenticator with
| Ok authenticator, None -> Ok (`Default (Tls.Config.client ~alpn_protocols ~authenticator ()))
| _, Some authenticator -> Ok (`Default (Tls.Config.client ~alpn_protocols ~authenticator ()))
| (Error _ as err), None -> err )
lazy
(match tls_config with
| Some cfg -> Ok (`Custom cfg)
| None -> (
let alpn_protocols =
match config with
| None -> ["h2"; "http/1.1"]
| Some (`H2 _) -> ["h2"]
| Some (`HTTP_1_1 _) -> ["http/1.1"] in
match authenticator, user's_authenticator with
| Ok authenticator, None ->
Ok (`Default (Tls.Config.client ~alpn_protocols ~authenticator ()))
| _, Some authenticator ->
Ok (`Default (Tls.Config.client ~alpn_protocols ~authenticator ()))
| (Error _ as err), None -> err))
let resolve_location ~uri ~location =
match String.split_on_char '/' location with
@ -311,39 +371,41 @@ let resolve_location ~uri ~location =
| "" :: "" :: _ ->
let schema = String.sub uri 0 (String.index uri '/') in
Ok (schema ^ location)
| "" :: _ ->
(match String.split_on_char '/' uri with
| schema :: "" :: user_pass_host_port :: _ ->
Ok (String.concat "/" [schema ; "" ; user_pass_host_port ^ location])
| _ -> Error (`Msg ("expected an absolute uri, got: " ^ uri)))
| "" :: _ -> (
match String.split_on_char '/' uri with
| schema :: "" :: user_pass_host_port :: _ ->
Ok (String.concat "/" [schema; ""; user_pass_host_port ^ location])
| _ -> Error (`Msg ("expected an absolute uri, got: " ^ uri)))
| _ -> Error (`Msg ("unknown location (relative path): " ^ location))
let one_request
?config
?tls_config:cfg
{ ctx; alpn_protocol; authenticator; }
?authenticator:user's_authenticator
?(meth= `GET)
?(headers= [])
?body
?(max_redirect= 5)
?(follow_redirect= true) uri =
let tls_config = tls_config ?tls_config:cfg ?config authenticator user's_authenticator in
if not follow_redirect
then single_request ~ctx ~alpn_protocol ?config tls_config ~meth ~headers ?body uri
?config
?tls_config:cfg
{ctx; alpn_protocol; authenticator}
?authenticator:user's_authenticator
?(meth = `GET)
?(headers = [])
?body
?(max_redirect = 5)
?(follow_redirect = true)
uri =
let tls_config =
tls_config ?tls_config:cfg ?config authenticator user's_authenticator in
if not follow_redirect then
single_request ~ctx ~alpn_protocol ?config tls_config ~meth ~headers ?body
uri
else
let rec follow_redirect count uri =
if count = 0 then Lwt.return_error (`Msg "Redirect limit exceeded")
else
single_request ~ctx ~alpn_protocol ?config tls_config ~meth ~headers ?body uri
single_request ~ctx ~alpn_protocol ?config tls_config ~meth ~headers
?body uri
>>? fun (resp, body) ->
if Status.is_redirection resp.status then
( match Headers.get resp.headers "location" with
match Headers.get resp.headers "location" with
| Some location ->
Lwt.return (resolve_location ~uri ~location) >>? fun uri ->
follow_redirect (pred count) uri
| None ->
Lwt.return_ok (resp, body) )
else
Lwt.return_ok (resp, body) in
| None -> Lwt.return_ok (resp, body)
else Lwt.return_ok (resp, body) in
follow_redirect max_redirect uri

39
src/http_mirage_client.mli
View file

@ -7,29 +7,30 @@ module type S = sig
end
module Make
(Pclock : Mirage_clock.PCLOCK)
(TCP : Tcpip.Tcp.S)
(Happy_eyeballs : Mimic_happy_eyeballs.S with type flow = TCP.flow) : S
(Pclock : Mirage_clock.PCLOCK)
(TCP : Tcpip.Tcp.S)
(Happy_eyeballs : Mimic_happy_eyeballs.S with type flow = TCP.flow) : S
module Version = Httpaf.Version
module Status = H2.Status
module Headers = H2.Headers
type response =
{ version : Version.t
; status : Status.t
; reason : string
; headers : Headers.t }
type response = {
version: Version.t
; status: Status.t
; reason: string
; headers: Headers.t
}
val one_request :
?config:[ `H2 of H2.Config.t | `HTTP_1_1 of Httpaf.Config.t ] ->
?tls_config:Tls.Config.client ->
t ->
?authenticator:X509.Authenticator.t ->
?meth:Httpaf.Method.t ->
?headers:(string * string) list ->
?body:string ->
?max_redirect:int ->
?follow_redirect:bool ->
string ->
(response * string option, [> Mimic.error ]) result Lwt.t
?config:[ `H2 of H2.Config.t | `HTTP_1_1 of Httpaf.Config.t ]
-> ?tls_config:Tls.Config.client
-> t
-> ?authenticator:X509.Authenticator.t
-> ?meth:Httpaf.Method.t
-> ?headers:(string * string) list
-> ?body:string
-> ?max_redirect:int
-> ?follow_redirect:bool
-> string
-> (response * string option, [> Mimic.error ]) result Lwt.t