How does a servlet handles request and gives response ?

[Lolita]

Hello friends I have been using the core java as far as the java programming is concerned , I am keen in understanding the request being handled and the response been generated . I am a bit aware that the Java servlets has http servlet and response that can be used do the said functions , if you have any sort of knowledge regarding this please let me know about it . I will request a programmer to respond on this .

[Shreevats]

When a browser requests a web page, it usually sends some supplementary headers which state things such as:

• A particular cookies set for that page;
• which browser or "agent" is
• generating request, along with details about the operating system, installed browser plugins etc;
• the referrer (usually the tie that the user clicked on that called the request);
• what types of content the browser can deal with.

[Villiers]

It's beyond the scope of this tutorial to give all the details of every possibly HTTP request header. And it's really quite rare to require to read request headers. If required, it is suggested that you look at the HTTP protocol requirement if you require more details. Though, we'll come across at a couple of functional cases here by way of example.

[Author]

Generally, we are aware the name of the request header that we desire to read. In this scenario, it is a easy subject of calling getHeader() on the HttpServletRequest object that was passed to our doGet()/doPost() function. For instance, here is how to read the user-agent header, which fundamentally informs us which browser (Internal Exlorer, Mozilla, Safari etc) and operating system is creating the request.