private static boolean maybeWebSocketUpgrade(AsciiString header, CharSequence value) {
        if (HttpHeaderNames.CONNECTION.contentEqualsIgnoreCase(header) &&
            HttpHeaderValues.UPGRADE.contentEqualsIgnoreCase(value)) {
            return true;
        }
        return HttpHeaderNames.UPGRADE.contentEqualsIgnoreCase(header) &&
               HttpHeaderValues.WEBSOCKET.contentEqualsIgnoreCase(value);
    }
Removes HTTP/1 specified headers from a mutable headers map.
Functionally this method is expected to behave the same as
{@link #toArmeria(io.netty.handler.codec.http.HttpHeaders, HttpHeadersBuilder)}.
This method should be preferred going forward as we continue implementing zero-copy
for HTTP1 en/decoders.
core/src/main/java/com/linecorp/armeria/internal/common/ArmeriaHttpUtil.java