Will requests sent from the PHP environment go through the hosts file?

Will requests from the php environment go through the hosts file?

Will.

The function of the hosts file is to contain the mapping relationship between IP address and Host name (host name). It is a regulation for mapping IP address and Host name (host name). The regulation requires that each segment can only contain one mapping relationship. , the IP address should be placed at the front of each paragraph, and the mapped Host name should be written after the space. The mapping description of this section is separated by "#" and then described in text.

How Hosts works in Windows

We know that to access a website on the Internet, we must first resolve the network domain name (www.XXXX.com) through the DNS server Only after the IP address becomes 61.XXX.XXX.XXX can our computer access it. If we have to wait for the domain name server to resolve and return IP information for each domain name request, the efficiency of accessing the network will be reduced, and the Hosts file can improve the resolution efficiency. According to Windows system regulations, before making a DNS request, the Windows system will first check whether there is such an address mapping relationship in its Hosts file. If so, it will call the IP address mapping. If not, it will propose domain name resolution to a known DNS server. In other words, the request level of Hosts is higher than that of DNS.

The role of hosts file

a) Speed ​​up domain name resolution

For websites that we want to visit frequently, we can configure the domain name and IP in Hosts Mapping relationship, so that when we enter the domain name, the computer can quickly resolve the IP without requesting the DNS server on the network.

b) Convenient for LAN users

In the LAN of many units, there will be servers available for users to use. However, since DNS servers are rarely installed in local area networks, accessing these services requires entering IP addresses that are difficult to remember, which is quite troublesome for many people. Now you can give these servers names that are easy to remember, and then establish IP mapping in Hosts, so that when you visit in the future, we can just enter the name of the server.

c) Block websites

There are many websites that install various plug-ins into your computer without the user's consent, and some of them may be Trojan horses or viruses. For these websites, we can use Hosts to map the domain name of the website to the wrong IP or the IP of our own computer, so that we do not need to access it.

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