front end
# Any deal directly with the user interface can be called front-end such as: computer interface, mobile phone interface, tablet interface
web nature
# Browser # server # file (the file extension is .html at the end, which means that they see the end of the .html file then it is a front-end page file) # file extension just does not matter because the posters computer are binary data
The nature of Web services
Enter the browser URL knockin transmitted several things? # The browser sends a request over the service # 2 receives the service request # 3 server returns a corresponding response # 4. Browser receives a response according to a specific rules render the page displayed to the user to see