In order to obtain a certificate from the certificate authority of your choice you have to create a Certificate Signing Request
(CSR). That CSR will be used by the certificate authority to create a certificate that will identify your website as "secure".
To create a CSR follow these steps:
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Create a local self-signed certificate.
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The CSR is then created using the following command:
openssl req –out {output-csr-file} –key {private-key-file} -new