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Certbot is an easy-to-use client that retrieves and distributes Let's Encrypt SSL / TLS certificates , thus enabling encrypted HTTPS on your web server. Certbot was developed by the Electronic Frontier Foundation EFF and others as a client for Let's Encrypt. You can read more about Certbot or Let's Encrypt, respectively. Do you run a web server with SSH access and want to install a free SSL certificate on the websites it hosts? You are in the right place, let's see how to secure your website using Certbot ACME on Nginx and Ubuntu . Premises To enable HTTPS on your website, you need to obtain a certificate (a type of file) from a certification authority (CA). Let's Encrypt is a CA. To get a certificate for your website's domain from Let's Encrypt, you need to demonstrate control over the domain. With Let's Encrypt, you do this using software that uses the ACME protocol which usually runs on your web host. To figure out which method will work best for you,...

Google definition for the Unavailable_After meta tag: Do not show this page in search results after the specified date / time. The date / time must be specified in a widely adopted format including, but not limited to RFC 822, RFC 850, and ISO 8601. The directive is ignored if no valid [date / time] is specified. By default there is no expiration date for content. several practical scenarios for the unavailable_after tag. The most obvious is for tests and limited time online pages . For example, suppose you have published a page with offers that expire on a certain date. The unavailable_after tag allows you to define when an indexed page on your website should disappear from Google results. Other practical cases? Suppose you have an event webpage, which links to a different event page each week. Or post jobs that are only available for one month. Pages like these, which show a limited-time offer or event , are great examples of pages you wouldn't want Google to crawl frequently aft...