The URL is analysed

URL

  • What is the url

URL is a Uniform Resource Locator. A URL is nothing more than the address of a given unique resource on the Web. In theory, every valid URL points to a unique resource. This resource can be an HTML page, a CSS document, an image, and so on. In practice, there are a few exceptions, the most common being a URL that points to a resource that doesn’t exist or has been moved. Because the resource rendered through the URL and the URL itself are handled by the Web server, the owner of the Web server needs to carefully maintain the resource and the URL associated with it

  • The composition of urld

http://www.example.com:80/path/to/myfile.htmlkey1=value1&key2=value2#SomewhereInTheDocument URL contains the following six parts:

  1. A protocol, such as https://, indicates which protocol the browser must use, HTTP or HTTPS.
  2. Domain name or IP address, www.example.com is the domain name. It indicates which Web server is being requested.
  3. Port, which represents the technical “gate” used to access resources on the Web server. If a Web server grants access to its resources using the standard port of the HTTP protocol (80 for HTTP and 443 for HTTPS), it is generally ignored. Otherwise it is mandatory.
  4. The path, /path/to/myfile.html is the path of the resource on the web server.
  5. Query parameters,? Key1 = valuE1&key2 =value2 are additional arguments provided to the network server. These parameters are a list of key/value pairs separated by ampersand. The Web server can use these parameters to perform additional operations before returning the resource. Each Web server has its own rules about parameters, and the only reliable way to know if a particular Web server handles parameters is by asking the Web server owner.
  6. The anchor point, #SomewhereInTheDocument is an anchor point for another part of the resource itself. An anchor represents a “bookmark” in a resource that gives the browser the direction of the content at that “bookmarked” location.

NDS

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The Domain Name System (DNS) is a service of the Internet. As a distributed database that maps domain names and IP addresses to each other, it makes it easier for people to access the Internet. DNS uses TCP and UDP port 53. Currently, each level of a domain name is limited to 63 characters, and the total length of a domain name cannot exceed 253 characters.

  • nslookup

This command is used to query DNS records to check whether domain names are resolved properly and diagnose network faults

  • How to use the nslookup command

1. Directly query nslookup domain [dns-server] 2. Querying other records Directly returns A record. You can specify parameters to query other records, such as AAAA and MX. nslookup -qt=type domain [dns-server] 3. To query more specific information, add the -d parameter to the domain name cache. Nslookup -d domain [dnS-server]

IP

  • The role of IP

“Internetwork protocol” is a protocol designed to connect computer networks to each other for communication

  • How do I use the ping command

The command is used to check whether the network is normal or the speed of the network connection. You can enter ping+ domain name on the terminal to query the network connection

The domain name

  • What is a domain name

Domain Name (English: Domain Name), also known as a Domain, is the Name of a computer or computer group on the Internet composed of a series of names separated by dots. It is used to identify the computer during data transmission

  • Level of domain name

Domain names can be divided into different levels, including top-level domain names, second-level domain names, and third-level domain names. For example, www.baidu.com. Com top-level domain name baidu.com second-level domain name www.baidu.com is a third-level domain name.