I've completed the chapter on Internationalization successfully, but found out just recently that the "Who Bought" function produces an error page that looks very ugly when someone enters a product ID that does not exist. My preference would be to design the app to have a list of hyperlinks presented when you visit the URL, http://localhost:3000/info/ that describes the list of "Info Functions" (eg "Who Bought" for starters). Then when it takes you there, http://localhost:3000/info/who_bought/ you would see a list of Book Titles as hyperlinks so that when you click on a book title, it redirects you to the appropriate URL for seeing a list of customers "who bought" that book. In this way I could avoid the user's temptation to use "non-existent" product ID's before it becomes a problem. But I have no idea how to go about creating these features. I'm open to some ideas.
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