JBridge: Certification Question Of The Day

Why might you use the method HttpServletResponse.encodeRedirectURL instead of HttpServletResponse.encodeURL? (1 correct answer)

The Answer

C is the correct answer. The advice is to always pass a URL through encodeRedirectURL() when preparing it as a parameter to the HttpServletResponse.sendRedirect() method. This is because - allegedly - redirect URLs have different encoding requirements to normal URLs.
A and B are wrong because forward() and include() from the RequestDispatcher happen on the server side. There is no need to return a session id to the client, so no need to encode it. (sendRedirect(), on the other hand, does return control back to the browser).
D is a correct statement, but does not explain why one method is to be preferred over the other.
And E is just a direct lie to persuade you to doubt that there really are two separate methods for encoding URLs.