The interviewer dug a hole for me: what's the use of "/ /" in URI?

When we browse the web , You need to type http:// perhaps https:// At the beginning URL Address , similar http://honeypps.com, So here "://" perhaps "//" What's the use ？

Speaking of URL I have to say URI 了 . What do you use to tag resources on the server ？ It's used URI（Uniform Resource Identifier）, Uniform resource identifier .URI It often appears in the browser's address bar , Sometimes it's called “ network address ”, abbreviation “ website ”. however , Strictly speaking ,URI Not exactly the same as the web address , It contains URL（Uniform Resource Locator, Uniform resource locator ） and URN（Uniform Resource Name, Unified resource naming ）.

because URL The popularity of , Narrowly , We can simply put URI and URL Think of it as equal .

Let's take a look URI The format of :

      
      

       
       URI 
       
       = 
       
       scheme:[
       
       //authority]path[?query][#fragment]
       
       

       
       authority 
       
       = [
       
       userinfo
       
       @]
       
       host[:
       
       port]
      
      
      
      

       
       
1.
       
       
2.
      
      

Structure diagram is as follows ：

The first part ,scheme, It can be translated into the agreement name , Indicates which protocol the resource should use to access . The most common is http and https 了 , Others are like ：ftp、file etc. .

stay scheme after , It must be three specific characters “://”, It is the scheme Separate from the back . This is the main character of today , If it's just to distinguish , You can just use “：” this 1 Letters , instead of “://” this 3 Letters .

stay “://” after , It's called “authority” Part of , Represents the host name of the resource , The usual form is “host:port”, That is, host name plus port number . before authority It also includes identity information userinfo, namely “user:passwd@” In the form of , But it's not popular now , You can ignore . What does the following mean , I'm sure you all know .

When someone asks you :// What's the use , It's actually digging a hole . When we were interviewing , Often after answering a question , The interviewer will hold on to a point in your answer “ Dig deep ”, It can also be called “ Life taking questions ”, Over time we will form a habit , I always think there is something deep behind the problem , We need to rack our brains to think . there :// It's a typical counterexample .

stay 2009 year 10 month ,BBC A piece of news in "//" Use of .. Here I cut a picture of this report , As shown below ：

In a Times article in October 2009, Berners-Lee admitted that the initial pair of slashes ("//") in a web address were "unnecessary". He told the newspaper that he easily could have designed web addresses without the slashes. "There you go, it seemed like a good idea at the time", he said in his lighthearted apology.

2009 year 10 month , Tim, the father of the World Wide Web · berners · Admitted by Li , It's a mistake to put a double slash in front of the website . At a seminar in Washington, D.C., he said , What he originally designed was to add “//” The plan , It's neither meaningful nor necessary . If there's a chance to do it again , He will take out the double slash .

Right , You're not mistaken ,URI Inside “//” Nothing diao use .

Why tim · berners · Li said “//” Useless is useless ？ Add Tim here · berners · Li's introduction .

7 month 27 Japan , At the Olympic Stadium in London 2012 At the opening ceremony of the London Olympic Games , A British scientist is on the stage , Accept the applause , This “ Thank you Tim ” The whole world , To be a highlight of the opening ceremony . He is the inventor of the Internet 、 Recognized by the industry as “ The father of the Internet ” Tim, an Englishman of • berners • Li （Tim Berners-Lee）. In the eyes of the whole world , He made a symbolic remark in front of a computer ：“This is for Everyone”, The meaning is ： The Internet is for everyone . Tim • berners • Lee is not only regarded as the pride of the British , He also indisputably won the respect of the whole world .

Not only did his invention change the way of human life , Changed the traditional model of global information exchange , It brings a new information age ; Even greater is , For the global popularity of the Internet , Let everyone have unrestricted access to the Internet , He renounced as “WWW” Patent application . Could have been in money with Bill • Gates is no match , But he decided to open his Internet achievements to the world free of charge , The individual has lost his precious wealth , But let all mankind, including us, benefit , Today we can click almost any website without “WWW”, This means that we are always sharing Tim's selfless dedication .1980 In Tim • berners • The program Li wrote laid the foundation of the Internet , To 2007 year 10 month , The number of global websites has broken through 2.5 One hundred million , As one can imagine , His dedication to the rapid development of the global Internet , Also let all network operators have made countless money .

1955 year 6 month 8 Japan , Tim • berners • Lee was born in southwest London, England . His parents are computer scientists , They are all involved in the world's first commercial computer —— Manchester 1 type （Manchester Mark I） Design and construction of .1976 Tim received his first class honours degree in physics from Oxford University .1980 year 6 Month to 9 month , Tim at CERN （CERN） when , Put forward an original idea ： Create a hypertext system based project , So that distributed computers can share and update information . meanwhile , He created ENQUIRE Prototype system .l990 year , Tim was at that time NEXTSTEP On the network system , Developed the world's first web server and the first client browser editor , Established the world's first WWW Website . He deserves to be the founder of the global Internet . today ,WWW、http Has become people's daily vocabulary , The Internet has affected our work 、 entertainment 、 Social and almost all other fields . But Tim never takes pride in himself , When it comes to achievement , He always says... Calmly ：“ I didn't invent the Internet , I just found a better way .”

Today's knowledge points , you GET Here we are ？

References

1. https://en.wikipedia.org/wiki/Uniform_Resource_Identifier
2. https://en.wikipedia.org/wiki/Tim_Berners-Lee
3. http://blog.sina.com.cn/s/blog_3e4d3af301017fnr.html

Want to know more ？ sweep Trace the QR code below and follow me

The background to reply ” Add group “ Access to official account entrance