Timeout with HTTPX + Faraday through a proxy results in SSLError

[sabribrn]

Hi 👋

It seems there is an issue with HTTPX, when used with Faraday, a proxy and when a timeout happens.

This snipppet should return a Faraday::TimeoutError but instead it returns a Faraday::SSLError:

Faraday.new(:ssl => { :ca_path => "/usr/lib/ssl/certs" }) do |conn|
  conn.url_prefix = "https://httpstat.us"
  conn.adapter :httpx
  conn.options.timeout = 1
  conn.proxy = "http://myproxy@myuser:33333"
end.get("/200?sleep=1200")

It triggers a request against https://httpstat.us/200?sleep=1200 which, with a timeout of 1sec, will time out.
Using httpx as adapter, it always return a SSLError:

SSL_connect returned=1 errno=0 peeraddr=10.140.0.88:443 state=error: certificate verify failed (self-signed certificate in certificate chain)

The same snippet, with a different adapter like net_http or http return the right error Faraday::TimeoutError.

More context

Gem versions

faraday 2.12.2
httpx 1.4.0

Previous bug

Previous to HTTPX v1.3.2, that snippet would have returned :

undefined method `empty?' for nil:NilClass (NoMethodError)

             __proxy_error?(response) && !@_proxy_uris.empty?

and that bug was solved here.

Certificate

Passing or not the certificate explicitly (:ssl => { :ca_path => "/usr/lib/ssl/certs" })) doesn't change the outcome

HTTPX only

Oddly enough, HTTPX without Faraday returns the right error