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  * JBoss, Home of Professional Open Source.
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package io.undertow.server.handlers;
Server side upgrade handler. This handler can inspect the request and modify the response.

If the request does not meet this handlers requirements it should return false to allow other upgrade handlers to inspect the request.

If the request is invalid (e.g. security information is invalid) this should thrown an IoException. if this occurs no further handlers will be tried.

Stuart Douglas
public interface HttpUpgradeHandshake {

Validates an upgrade request and returns any extra headers that should be added to the response.

exchange the server exchange
true if the handshake is valid and should be upgraded. False if it is invalid
Throws: If the handshake is invalid
    boolean handleUpgrade(final HttpServerExchange exchangethrows IOException;
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