| 以 Tomcat 服务器“http://localhost:8080/vote/test.jsp”为例说明：
request.getScheme() —— http
request.getServerName() —— localhost
request.getServerPort() —— 8080
request.getContextPath() —— /vote
request.getProtocol() —— HTTP/1.1
request.getRemoteAddr() —— 127.0.0.1
request.getRemoteHost() —— 127.0.0.1
request.getRemotePort() —— 1316
request.getRequestURI() —— /vote/test.jsp
request.getRequestURL() —— http://localhost:8080/vote/test.jsp
request.getServletPath() —— /test.jsp
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