Meaning of path and basepath in JSP pages

Today, when we look at the code, we find that the program uses Request.getscheme (). Don't understand what it means, check it. The results are organized as follows:

1. Request.getscheme () returns the protocol used by the current link; The general application returns HTTP; SSL returns HTTPS;

2. The application in the program is as follows:

String path = Request.getcontextpath ();
String basepath = request.getscheme () + "://" +request.getservername () + ":" +request.getserverport () +path+ "/";
<base href= "<%=basePath%>" >

3, review the usual methods of request:

Request.getschema () can return the protocol used by the current page, http or HTTPS;

Request.getservername () can return the name of the server on which the current page is located;

Request.getserverport () can return the port used by the server on which the current page is located, which is 80;

Request.getcontextpath () can return the name of the app where the current page is located;

Meaning of path and basepath in JSP pages