Created
April 26, 2018 11:56
-
-
Save bramford/93212ddff807bc131d1562197f5f2d01 to your computer and use it in GitHub Desktop.
A TLS error using cohttp-lwt and cohttp-lwt-unix. How can I debug it further?
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
(* Paste this source file in to your toplevel *) | |
(* There is some attribute of the TLS connection to remoteok.io that causes | |
a fatal Tls_alert (HANDSHAKE_FAILURE). `curl` has no trouble connecting to | |
this same host. I assume there's a difference between the defaults used by | |
`Cohttp_lwt_unix.Client.get` and those used by`curl`. | |
site. | |
How can I debug it further? I've tried to establish a TLS connection directly with Tls_lwt.connect but it's too complex to use without more reading. | |
*) | |
#require "lwt";; | |
#require "cohttp-lwt";; | |
#require "cohttp-lwt-unix";; | |
let body = | |
let open Lwt in | |
try | |
(* google.com, for example, has no errors and the response is valid | |
Cohttp_lwt_unix.Client.get (Uri.of_string "https://google.com") >>= fun (resp,body) -> | |
*) | |
Cohttp_lwt_unix.Client.get (Uri.of_string "https://remoteok.io/api") >>= fun (resp,body) -> | |
Cohttp_lwt.Body.to_string body >|= fun body -> | |
body | |
with | |
(* This attempt to catch and print the exception fails. I assume this is because it is FATAL and causes the program to exit immediately before this logic can run *) | |
| Tls_lwt.Tls_alert e -> | |
print_endline (Tls.Packet.alert_type_to_string e); | |
exit 1 | |
;; | |
let body = Lwt_main.run body;; | |
(* toplevel output *) | |
(* | |
Exception: | |
Tls_lwt.Tls_alert | |
Tls.Packet.HANDSHAKE_FAILURE. | |
Raised at file "src/core/lwt.ml", line 3008, characters 20-29 | |
Called from file "src/unix/lwt_main.ml", line42, characters 8-18 | |
Called from file "//toplevel//", line 1, characters 11-28 | |
Called from file "toplevel/toploop.ml", line 180, characters 17-56 | |
*) | |
(* I also tried using `cohttp-curl-lwt` but received the same error *) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment