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Helper: ResponseHelper

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Helpers are essentially Java classes that can be used in JSP pages.  The ResponseHelper is a core helper (meaning that it rarely, if ever be modified).  It includes helper methods for sending HTTP responses.

Uses

A typical use for this helper is within a callback JSP fragment to test if the response was successful, or to test if the user needs to authenticate before they are allowed to see the page contents.

Methods

ResponseHelper.sendOkResponse(response)

Parameters: javax.servlet.http.HttpServletResponse

Returns:

Sends an HTTP OK status code (200) back as a response code indicating the request was handled successfully.

Example

if ("200".equals(request.getParameter("status"))) {
    ResponseHelper.sendOkResponse(response);
}
 

ResponseHelper.sendRedirectResponse(response, location)

Parameters: javax.servlet.http.HttpServletResponse, String

Returns:

Sends an HTTP redirection/temporarily moved status code (302) back as a response code indicating the request was redirected to another location.  The new location should be handled automatically by the browser, but can be obtained as the location header of the response.

 

ResponseHelper.sendUnauthorizedResponse(response)

Parameters: javax.servlet.http.HttpServletResponse

Returns:

Sends an HTTP unauthorized status code (401) back as a response code indicating the user must authenticate before accessing the intended URL.

Example

if ("401".equals(request.getParameter("status")) || context == null) {
    ResponseHelper.sendUnauthorizedResponse(response);
}