I get this error with both :httpc and HTTPoison.get. Here’s HTTPoison:
iex(1)> HTTPoison.get! "https://grad.tamu.edu/"
22:15:54.179 [notice] TLS :client: In state :certify at ssl_handshake.erl:2138 generated CLIENT ALERT: Fatal - Unknown CA
** (HTTPoison.Error) {:tls_alert, {:unknown_ca, ~c"TLS client: In state certify at ssl_handshake.erl:2138 generated CLIENT ALERT: Fatal - Unknown CA\n"}}
(httpoison 2.2.0) lib/httpoison/base.ex:451: HTTPoison.request!/5
iex:1: (file)
Same with this:
iex(1)> :httpc.request(:get, {'https://grad.tamu.edu/', []}, [], [])
22:24:10.836 [notice] TLS :client: In state :certify at ssl_handshake.erl:2138 generated CLIENT ALERT: Fatal - Unknown CA
{:error,
{:failed_connect,
[
{:to_address, {~c"grad.tamu.edu", 443}},
{:inet, [:inet],
{:tls_alert,
{:unknown_ca,
~c"TLS client: In state certify at ssl_handshake.erl:2138 generated CLIENT ALERT: Fatal - Unknown CA\n"}}}
]}}
.tool-versions:
elixir 1.15.2-otp-26
erlang 26.0.2
I’ve seen this pop up periodically over the years. What’s the root cause?
I’m thinking of making an elixir lib that simply shells out to curl, which has no problems:
$ curl --head https://grad.tamu.edu/
HTTP/2 200
cache-control: private
content-length: 46798
content-type: text/html; charset=utf-8
server: Microsoft-IIS/10.0
x-aspnetmvc-version: 5.2
x-aspnet-version: 4.0.30319
x-powered-by: ASP.NET
date: Wed, 15 Nov 2023 05:20:20 GMT
strict-transport-security: max-age=4294967294
EDIT: I made this dead simple Hex Package.
CurlEx.get!(url)
