public final PoolingHttpClientConnectionManagerBuilder setSocketConfigResolver(
            final Resolver<HttpRoute, SocketConfig> socketConfigResolver) {
        this.socketConfigResolver = socketConfigResolver;
        return this;
    }
Sets {@link Resolver} of {@link SocketConfig} on a per route basis.

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