Basic Concepts

Static content is the same every time it is delivered to users. It includes images, videos, HTML, CSS, and JS files on websites, software installation packages, APK files, and compressed packages.

Dynamic content changes every time it is served to users. It includes ASP, JSP, PHP, PERL, and CGI files on websites, APIs, and database interaction requests.

Acceleration domain names are provided by you for CDN acceleration. A domain name is an identification string that defines a realm of administrative autonomy, authority, or control within the Internet, such as a website, an email address, or an FTP server.

A Canonical Name record (CNAME record) is a type of resource record in the Domain Name System (DNS) that maps one domain name (an alias) to another (the canonical name).

Example:

1. You have a server that stores some files. You can access the files through file.example.com, but you want to access them through data.example.com.
2. Add a CNAME record to your domain's DNS records so that data.example.com points to file.example.com.
3. After the CNAME record has been added, all requests for data.example.com will be redirected to file.example.com, and users can get the same content.

On the CDN console, after a domain name is added, the system will assign a CNAME (in the form of *.*.c.cdnhwc1.com) to the domain name. Then, add this CNAME to your domain's DNS records and point the domain name to it. After the CNAME record takes effect, all the requests for your domain name will be redirected to CDN PoPs.

An origin server is the customer's service server, the source of the data accelerated for delivery.

DNS translates human readable domain names into IP addresses. With DNS, users can access servers using their assigned domain names.

For example, when you access xxx.abc.com, the domain name is converted into xxx.xxx.1.1 (an IP address) through DNS. You can use Huawei Cloud DNS or a DNS service from other providers.

PoPs are also known as CDN nodes or cache nodes, which users need the fewest intermediate steps to connect to. Compared with other nodes, PoPs provide users with faster response and connection.

If a CDN PoP does not cache origin content or if cached content has expired, the CDN PoP obtains the requested content from the origin server and returns it to the client.

For example, if you access a URL and the CDN PoP does not cache the content, your request will be sent to the origin server and a response will be returned based on the URL.

The origin server determines the IP address of the origin server that an origin pull request is sent to. The host determines which site the origin pull request is sent to.

Example 1: If the origin domain is www.origin.com but the host is www.abc.com, origin pull requests actually go to www.abc.com.

Example 2: If the origin IP address is 192.168.1.1 but the host is www.abc.com, origin pull requests actually go to www.abc.com.

Secure Sockets Layer (SSL) is a cryptographic protocol designed to provide communications security over a computer network. Transport Layer Security (TLS) is an improved version of SSL and has now replaced SSL.

Enable this configuration item based on your service needs, to filter out parameters after the question mark (?) in a URL and improve the cache hit ratio.