httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/ClientHttpProtocolNegotiationStarter.java [68:82]:
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            final HttpVersionPolicy versionPolicy,
            final TlsStrategy tlsStrategy,
            final Timeout handshakeTimeout,
            final Callback<Exception> exceptionCallback) {
        this.http1StreamHandlerFactory = Args.notNull(http1StreamHandlerFactory, "HTTP/1.1 stream handler factory");
        this.http2StreamHandlerFactory = Args.notNull(http2StreamHandlerFactory, "HTTP/2 stream handler factory");
        this.versionPolicy = versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE;
        this.tlsStrategy = tlsStrategy;
        this.handshakeTimeout = handshakeTimeout;
        this.exceptionCallback = exceptionCallback;
    }

    @Override
    public HttpConnectionEventHandler createHandler(final ProtocolIOSession ioSession, final Object attachment) {
        HttpVersionPolicy endpointPolicy = versionPolicy;
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httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/ServerHttpProtocolNegotiationStarter.java [68:82]:
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            final HttpVersionPolicy versionPolicy,
            final TlsStrategy tlsStrategy,
            final Timeout handshakeTimeout,
            final Callback<Exception> exceptionCallback) {
        this.http1StreamHandlerFactory = Args.notNull(http1StreamHandlerFactory, "HTTP/1.1 stream handler factory");
        this.http2StreamHandlerFactory = Args.notNull(http2StreamHandlerFactory, "HTTP/2 stream handler factory");
        this.versionPolicy = versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE;
        this.tlsStrategy = tlsStrategy;
        this.handshakeTimeout = handshakeTimeout;
        this.exceptionCallback = exceptionCallback;
    }

    @Override
    public HttpConnectionEventHandler createHandler(final ProtocolIOSession ioSession, final Object attachment) {
        HttpVersionPolicy endpointPolicy = versionPolicy;
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