httpclient5/src/main/java/org/apache/hc/client5/http/impl/classic/HttpClientBuilder.java [718:726]:
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    protected void addCloseable(final Closeable closeable) {
        if (closeable == null) {
            return;
        }
        if (closeables == null) {
            closeables = new ArrayList<>();
        }
        closeables.add(closeable);
    }
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java [642:650]:
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    protected void addCloseable(final Closeable closeable) {
        if (closeable == null) {
            return;
        }
        if (closeables == null) {
            closeables = new ArrayList<>();
        }
        closeables.add(closeable);
    }
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncClientBuilder.java [755:763]:
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    protected void addCloseable(final Closeable closeable) {
        if (closeable == null) {
            return;
        }
        if (closeables == null) {
            closeables = new ArrayList<>();
        }
        closeables.add(closeable);
    }
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