以下は、各環境変数を取得して、ブラウザ画面に表示するサーバサイドプログラムのサンプルです。
<%
String strServerName = request.getServerName();
String strServerProtocol = request.getProtocol();
String strRequestMethod = request.getMethod();
String strPathInfo = request.getPathInfo();
String strScriptName = request.getServletPath();
String strQueryString = request.getQueryString();
String strRemoteAddr = request.getRemoteAddr();
String strRemoteHost = request.getRemoteHost();
int numContentLength = request.getContentLength();
String strHttpUserAgent = request.getHeader("User-Agent");
String strHttpReferer = request.getHeader("Referer");
%>
<html>
<body>
SERVER_NAME = <%=strServerName%><br>
SERVER_PROTOCOL = <%=strServerProtocol%><br>
REQUEST_METHOD = <%=strRequestMethod%><br>
PATH_INFO = <%=strPathInfo%><br>
SCRIPT_NAME = <%=strScriptName%><br>
QUERY_STRING = <%=strQueryString%><br>
REMOTE_ADDR = <%=strRemoteAddr%><br>
REMOTE_HOST = <%=strRemoteHost%><br>
CONTENT_LENGTH = <%=numContentLength%><br>
HTTP_USER_AGENT = <%=strHttpUserAgent%><br>
HTTP_REFERER = <%=strHttpReferer%><br>
</body>
</html>
String strServerName = request.getServerName();
String strServerProtocol = request.getProtocol();
String strRequestMethod = request.getMethod();
String strPathInfo = request.getPathInfo();
String strScriptName = request.getServletPath();
String strQueryString = request.getQueryString();
String strRemoteAddr = request.getRemoteAddr();
String strRemoteHost = request.getRemoteHost();
int numContentLength = request.getContentLength();
String strHttpUserAgent = request.getHeader("User-Agent");
String strHttpReferer = request.getHeader("Referer");
%>
<html>
<body>
SERVER_NAME = <%=strServerName%><br>
SERVER_PROTOCOL = <%=strServerProtocol%><br>
REQUEST_METHOD = <%=strRequestMethod%><br>
PATH_INFO = <%=strPathInfo%><br>
SCRIPT_NAME = <%=strScriptName%><br>
QUERY_STRING = <%=strQueryString%><br>
REMOTE_ADDR = <%=strRemoteAddr%><br>
REMOTE_HOST = <%=strRemoteHost%><br>
CONTENT_LENGTH = <%=numContentLength%><br>
HTTP_USER_AGENT = <%=strHttpUserAgent%><br>
HTTP_REFERER = <%=strHttpReferer%><br>
</body>
</html>