Thanks for your reply, puppy worked perfectly fine, and it fits my inmediate 
wish of learning nim by doing small examples.

But still if someone knows how to do it with with the stdlib i'll be grateful. 
I also tried downloading the cacert.pem used by curl but it did not work and 
neither disabling verification.
    
    
    var ctx = newContext(verifyMode = CVerifyNone)
    var client = newHttpClient(sslContext = ctx)
    
    
    Run

I did not have problems accessing from outside mexico (us).
    
    
    curl 
"https://www.correosdemexico.gob.mx/SSLServicios/ConsultaCP/Descarga.aspx"; 
--verbose
    *   Trying 187.218.53.183:443...
    * Connected to www.correosdemexico.gob.mx (187.218.53.183) port 443 (#0)
    * ALPN, offering h2
    * ALPN, offering http/1.1
    *  CAfile: /etc/ssl/certs/ca-certificates.crt
    *  CApath: /etc/ssl/certs
    * TLSv1.0 (OUT), TLS header, Certificate Status (22):
    * TLSv1.3 (OUT), TLS handshake, Client hello (1):
    * TLSv1.2 (IN), TLS header, Certificate Status (22):
    * TLSv1.3 (IN), TLS handshake, Server hello (2):
    * TLSv1.2 (IN), TLS handshake, Certificate (11):
    * TLSv1.2 (IN), TLS handshake, Server key exchange (12):
    * TLSv1.2 (IN), TLS handshake, Server finished (14):
    * TLSv1.2 (OUT), TLS header, Certificate Status (22):
    * TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
    * TLSv1.2 (OUT), TLS header, Finished (20):
    * TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
    * TLSv1.2 (OUT), TLS header, Certificate Status (22):
    * TLSv1.2 (OUT), TLS handshake, Finished (20):
    * TLSv1.2 (IN), TLS header, Finished (20):
    * TLSv1.2 (IN), TLS header, Certificate Status (22):
    * TLSv1.2 (IN), TLS handshake, Finished (20):
    * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-SHA384
    * ALPN, server did not agree to a protocol
    * Server certificate:
    *  subject: CN=www.correosdemexico.gob.mx
    *  start date: Jul 20 03:57:20 2023 GMT
    *  expire date: Jul 20 22:51:04 2024 GMT
    *  subjectAltName: host "www.correosdemexico.gob.mx" matched cert's 
"www.correosdemexico.gob.mx"
    *  issuer: C=US; ST=Arizona; L=Scottsdale; O=GoDaddy.com, Inc.; 
OU=http://certs.godaddy.com/repository/; CN=Go Daddy Secure Certificate 
Authority - G2
    *  SSL certificate verify ok.
    * TLSv1.2 (OUT), TLS header, Supplemental data (23):
    > GET /SSLServicios/ConsultaCP/Descarga.aspx HTTP/1.1
    > Host: www.correosdemexico.gob.mx
    > User-Agent: curl/7.81.0
    > Accept: */*
    >
    * TLSv1.2 (IN), TLS header, Supplemental data (23):
    * Mark bundle as not supporting multiuse
    < HTTP/1.1 200 OK
    < Cache-Control: private
    < Content-Type: text/html; charset=iso-8859-1
    < Server: Microsoft-IIS/8.5
    < X-AspNet-Version: 2.0.50727
    < X-Powered-By: ASP.NET
    < Date: Sat, 10 Feb 2024 15:46:04 GMT
    < Content-Length: 11917
    
    
    
    Run

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