public final PoolingAsyncClientConnectionManagerBuilder setDefaultConnectionConfig(final ConnectionConfig config) {
        this.connectionConfigResolver = route -> config;
        return this;
    }
Sets the same {@link ConnectionConfig} for all routes.

@return this instance.
@since 5.2
httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/PoolingAsyncClientConnectionManagerBuilder.java