[JSP] request 용 패스 범위

ex) http://localhost/test/test.jsp

request.getContextPath()   return /test

request.getRequestURI()  return /test/test.jsp

request.getRequestURL() return http://localhost/test/test.jsp

request.ServletPath()  return /test.jsp

request.getRealPath("")  return null or c:/www/webapps/test

host = url.replace(uri,"").replace(contextPath,"");    return http://localhost

remoteAddr = request.getRemoteAddr();            remoteAddr(ex. 0.0.0.0)