See Common Usage Errors which says:

If the verification does not succeed with the default settings, one can do the following:

• Make sure the needed CAs are in the store, maybe use SSL_ca_file or SSL_ca_path to specify a different CA store.
• If the validation fails because the certificate is self-signed and that's what you expect, you can use the SSL_fingerprint option to accept specific leaf certificates by their certificate or pubkey fingerprint.
• If the validation failed because the hostname does not match and you cannot access the host with the name given in the certificate, you can use SSL_verifycn_name to specify the hostname you expect in the certificate.

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