Difference between httpservletrequest and httpservletresponse
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Answer:
1. Http. Servlets are actually generic components designed to support any sort of operation that operates in a request/response cycle. That mostly means HTTP, but ages ago, IBM mainframes routinely did their online apps in a framework known as CICS (Customer Information Control System). It didn't use tcp/ip (not invented yet), and it didn't use HTML or HTTP (also not invented yet), but it was (mostly) request/response. So had servlets - or Java - existed back then, they would have been appropriate.
What an HttpServlet adds to the core servlet class is support for things specific to HTTP. For example, how URLs are processed, the difference between request types (GET, POST, HEAD, DELETE and so forth).
2. Both (an HttpServletRequest is a subclass of ServletRequest). When an HTTP client sends an HTTP(S) URL request to a J2EE webapp server, the server digests the incoming request and constructs an HttpServletRequest and corresponding HttpServletResponse object. Among other things, such as matching up sessions, if applicable.
Don't forget that all of the above are Interfaces, not classes, so the server's specific implementation class will implement the interface, but its properties and behaviours above and beyond what those interfaces demand are server-specific.