Khi request HOST cài SSL thì cần phải đảm bảo có những file như (crt, key, pem, pfx,...).
Mở file bằng Notepad, nhìn dòng đầu và dòng cuối để biết file gì:
-----BEGIN CERTIFICATE-----
MIIGpDCCBYygAwIBAgIQCrWg6/cP1Y1qYOPaOxJk0DANBgkqhkiG9w0BAQsFADBZ
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMTMwMQYDVQQDEypS
PB0ZRzT3JKBSmWk3w ... dxxkfW97d5XtEixwNTce/3aCHJ1ivc
f0u163DjYO3CmebXHAyd5FpszqaFrX29vQFF/1mrw7/pd77JffmP6o8BIo2xrq0f
hIRi5Y1aT4uw/q+K2tEPsB6WUg4r7YYp
-----END CERTIFICATE-----
-----BEGIN PRIVATE KEY-----
MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDZgq+0hUok18fb
PRPNlJM4+/ANA9c329wUGGUyJwWvHNiqNgluuqp1VjtFQfoaraXaPK1g16M8HRlH
NPckoFKZaTfCh9u+Xm3wiarj4i ... CUCgYAn55Na3tvRisIUEVc2
K36njpoNhQ9kxjoPzFUIjccsAO9/Mt8eXL1xBdX38ox/0g+fTkLqotT6+ERWhRti
fz/xoHov8rii6yDaSMMumw/DuQ8s/v6eZqN/jlqoRToEziFR5UAb4HmSQ94uki8+
3P0hk68HHT45bb9NnnDcIZki/A==
-----END PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
MIIFUTCCBDmgAwIBAgIQB5g2A63jmQghnKAMJ7yKbDANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQD ... BAnGJWkLPijlACd3sWFMVUiKRz1C5PZy
el2l7J/W4d99KFLSYgoy5GDmARpwLc//fXfkr40nMY8ibCmxCsjXQTe0fJbtrrLL
yWQlk9VDV296EI/kQOJNLVEkJ54P
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSAwHgYDV ... c4L0na4UU+Krk2U886UAb3LujEV0ls
YSEY1QSteDwsOoBrp+uvFRTp2InBuThs4pFsiv9kuXclVzDAGySj4dzp30d8tbQk
CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
-----END CERTIFICATE-----