How to gather miscellaneous information from HttpRequest

We can gather the miscellaneous information from HttpRequest by calling various getxxx methods on request object as shown below.

* Use user-agent request header that holds browser software name as shown below.

  In service (–) method

 PW.println (“<br> <br> the current browser window” +req.getHeader (“user-agent”) )// request header name.

* The URL pattern of servlet program is technically called as servlet path.

   //example request URL: https://ecomputernotes.com:2020/FolderName/PName? sno=11

PW.println (“<br> miscellaneous information of http request”);

//methods available in javax.Servlet.ServletRequest

PW.println (“<br> Request Content Length:” +req.getContentLength ());
 //gives request data length in bytes like 345 bytes (if not known gives -1)
PW.println (“<br> request content type:” +req.getContentType ());
 //gives request content like text/html (if not known gives null)
PW.println (“<br> request protocol:” +req.getProtocol ());
 //gives http/1.1
PW.println (“<br> request scheme:” +req.getScheme ());
 //gives Http
PW.println (“<br> request browser window machine IP address:” +req.getRemoteAddr ());
//gives 127.0.0.1
PW.println (“<br> browser window machine host name:” +req.getRemoteHost ());
//gives current computer name otherwise IP address
PW.println (“<br> browser window port no:” +req.getRemotePort ());
//gives 2922 for Netscape, 2926 for IE
PW.println (“<br> server name” +req.getServerName ());
//gives the domain name typed in the url like local host
PW.println (“<br> server port” +req.getServerPort ());
//gives 2020
//methods available in javax.Servlet.HttpServletRequest
PW.println (“<br> context path:” +req.getContextPath ());
//gives FolderName
PW.println (“<br> request method is:” +req.getMethod ());
//gives GET
PW.println (“<br> request path info is:” +req.getPathInfo ());
//gives additional information kept in request url (otherwise null)
PW.println (“<br> query string is:” +req.getQueryString ());
//gives sno = 11
PW.println (“<br> request uri:” +req.getRequestURI ());
//gives /FolderName/PName
PW.println (“<br> request url:” +req.getRequestURL ());
//gives https://ecomputernotes.com:2020/ FolderName/PName
PW.println (“<br> servlet path:” +req.getServletPath ());
//gives /PName

* Servlet program can avoid browser dependent tags while generating html tags based response if by knowing browser software name through the request header user-agent.

When web resource program (like servlet program) sends response to browser window the generated http response contain multiple details including response content. Those details can be remembered as SCH details.