I have written a new python client using only cryptography.io as cryptographic library.
Everything works fine except for the concatenation of intermediate certificates.
First, I think that the schema on https://letsencrypt.org/certificates/ is outdated because it does not mention X3 and X4 certificates.
Then, I don’t understand why these certificates are not provided through the ACME protocol. Maybe the official letsencrypt server could offer them as an extension of the protocol, through another URI ?
Finally, I don’t understand how I should concatenate them. Is it the following ?
[certificate issued by the ACME protocol]
Thanks in advance for any answer,