Quick Guide to HTTP Requests in Java

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Quick Guide to HTTP Requests
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For the most commonly used request handler methods, the following list provides a quick guide of what the HTTP requests are for:
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GET: A call to get information from the server and return it in a response to the client The method processing this call must not have any side effects, so it can be repeated safely again and again A GET call is typically used when a servlet URL is accessed directly from a Web browser or via a forward from a form on an HTML or JSP page A GET call shows the data being passed to the servlet as part of the displayed URL on most Web browsers In certain cases, this might not be very desirable from a security pers pective
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POST: A call to allow the client to send data to the server The method processing this call is allowed to cause side effects, such as updating of data stored on the server A POST call can be used instead of a GET when forwarding from a form on a n HTML or JSP page Unlike GET, the use of POST hides from view any data being passed to the servlet Some developers choose to process GET and POST exactly the same, or simply ignore one or the other if they do not want that particular call to be supporte d
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PUT: This call is similar to POST, but allows the client to place an actual file on a server instead of just sending data It is also allowed to cause side effects, just like POST Although available, the use of a PUT call is not very common
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DELETE: This call is similar to PUT, but allows the client to remove a file or Web page from the server It is also allowed to cause side effects in the same way as PUT Although available, the use of a DELETE call is not very common
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There is another request not specifically mentioned in the preceding list called HTTP HEAD This request, although valid in the context of the HttpServlet class itself, is actually handled internally by making a call to the doGet method, which you might have overridden It differs in that it only returns the response headers that result from processing doGet and none of the actual response data
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The RequestDispatcher Interface
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Given the simplicity of servlets, it makes sense to keep each servlet focused on a specific task, and then set u p multiple servlets to collaboratively achieve a more complex task Servlets can take care of the mechanical aspects of such collaborative efforts easily by implementing the RequestDispatcher interface
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The RequestDispatcher interface provides two key capabilities:
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forward: This method allows a servlet to forward a request to another Web component The servlet forwarding the request may process the request in some way prior to the forwarding Forward can effectively be used to achieve servlet chaining where each link in the chain produces some output that can be merged with the original request data, and then be used as the input to the next servlet in the chain This is essentially similar to the concept of pipes in the UNIX world
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Note that the term "redirect" is sometimes used interchangeably with "forward," intending the same meaning However, this should not be confused with the sendRedirect method found on the servlet response A sendRedirect call does not guarantee preservation of the request data when it forwards to a new page, so it does not allow for the same servlet chaining capabilities
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include: This method permits the contents of another Web component to be included in the response from the calling servlet The first servlet simply includes the o ther servlet at the appropriate point in the output, and the output from the servlet being included is added to the output stream This is similar in concept to Server Side Includes (SSI)[2]
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