index.jsp
<body>
<form action="inde.jsp" method="post">
<button type="submit">Submit</button>
<button type="reset">Reset</button>
</form>
</body>
error.jsp
<body>
<h1>404</h1>
</body>
web.xml
<error-page>
<error-code>404</error-code>
<location>/error.jsp</location>
</error-page>
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