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diff --git a/org.argeo.cms.jcr/src/org/argeo/jcr/proxy/AbstractUrlProxy.java b/org.argeo.cms.jcr/src/org/argeo/jcr/proxy/AbstractUrlProxy.java
new file mode 100644
index 0000000..0177636
--- /dev/null
+++ b/org.argeo.cms.jcr/src/org/argeo/jcr/proxy/AbstractUrlProxy.java
@@ -0,0 +1,153 @@
+package org.argeo.jcr.proxy;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+import javax.jcr.Binary;
+import javax.jcr.Node;
+import javax.jcr.Property;
+import javax.jcr.Repository;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+import javax.jcr.nodetype.NodeType;
+
+import org.argeo.api.cms.CmsLog;
+import org.argeo.jcr.JcrException;
+import org.argeo.jcr.JcrUtils;
+
+/** Base class for URL based proxys. */
+public abstract class AbstractUrlProxy implements ResourceProxy {
+	private final static CmsLog log = CmsLog.getLog(AbstractUrlProxy.class);
+
+	private Repository jcrRepository;
+	private Session jcrAdminSession;
+	private String proxyWorkspace = "proxy";
+
+	protected abstract Node retrieve(Session session, String path);
+
+	void init() {
+		try {
+			jcrAdminSession = JcrUtils.loginOrCreateWorkspace(jcrRepository, proxyWorkspace);
+			beforeInitSessionSave(jcrAdminSession);
+			if (jcrAdminSession.hasPendingChanges())
+				jcrAdminSession.save();
+		} catch (RepositoryException e) {
+			JcrUtils.discardQuietly(jcrAdminSession);
+			throw new JcrException("Cannot initialize URL proxy", e);
+		}
+	}
+
+	/**
+	 * Called before the (admin) session is saved at the end of the initialization.
+	 * Does nothing by default, to be overridden.
+	 */
+	protected void beforeInitSessionSave(Session session) throws RepositoryException {
+	}
+
+	void destroy() {
+		JcrUtils.logoutQuietly(jcrAdminSession);
+	}
+
+	/**
+	 * Called before the (admin) session is logged out when resources are released.
+	 * Does nothing by default, to be overridden.
+	 */
+	protected void beforeDestroySessionLogout() throws RepositoryException {
+	}
+
+	public Node proxy(String path) {
+		// we open a JCR session with client credentials in order not to use the
+		// admin session in multiple thread or make it a bottleneck.
+		Node nodeAdmin = null;
+		Node nodeClient = null;
+		Session clientSession = null;
+		try {
+			clientSession = jcrRepository.login(proxyWorkspace);
+			if (!clientSession.itemExists(path) || shouldUpdate(clientSession, path)) {
+				nodeAdmin = retrieveAndSave(path);
+				if (nodeAdmin != null)
+					nodeClient = clientSession.getNode(path);
+			} else
+				nodeClient = clientSession.getNode(path);
+			return nodeClient;
+		} catch (RepositoryException e) {
+			throw new JcrException("Cannot proxy " + path, e);
+		} finally {
+			if (nodeClient == null)
+				JcrUtils.logoutQuietly(clientSession);
+		}
+	}
+
+	protected synchronized Node retrieveAndSave(String path) {
+		try {
+			Node node = retrieve(jcrAdminSession, path);
+			if (node == null)
+				return null;
+			jcrAdminSession.save();
+			return node;
+		} catch (RepositoryException e) {
+			JcrUtils.discardQuietly(jcrAdminSession);
+			throw new JcrException("Cannot retrieve and save " + path, e);
+		} finally {
+			notifyAll();
+		}
+	}
+
+	/** Session is not saved */
+	protected synchronized Node proxyUrl(Session session, String remoteUrl, String path) throws RepositoryException {
+		Node node = null;
+		if (session.itemExists(path)) {
+			// throw new ArgeoJcrException("Node " + path + " already exists");
+		}
+		try (InputStream in = new URL(remoteUrl).openStream()) {
+			// URL u = new URL(remoteUrl);
+			// in = u.openStream();
+			node = importFile(session, path, in);
+		} catch (IOException e) {
+			if (log.isDebugEnabled()) {
+				log.debug("Cannot read " + remoteUrl + ", skipping... " + e.getMessage());
+				// log.trace("Cannot read because of ", e);
+			}
+			JcrUtils.discardQuietly(session);
+			// } finally {
+			// IOUtils.closeQuietly(in);
+		}
+		return node;
+	}
+
+	protected synchronized Node importFile(Session session, String path, InputStream in) throws RepositoryException {
+		Binary binary = null;
+		try {
+			Node content = null;
+			Node node = null;
+			if (!session.itemExists(path)) {
+				node = JcrUtils.mkdirs(session, path, NodeType.NT_FILE, NodeType.NT_FOLDER, false);
+				content = node.addNode(Node.JCR_CONTENT, NodeType.NT_UNSTRUCTURED);
+			} else {
+				node = session.getNode(path);
+				content = node.getNode(Node.JCR_CONTENT);
+			}
+			binary = session.getValueFactory().createBinary(in);
+			content.setProperty(Property.JCR_DATA, binary);
+			JcrUtils.updateLastModifiedAndParents(node, null, true);
+			return node;
+		} finally {
+			JcrUtils.closeQuietly(binary);
+		}
+	}
+
+	/** Whether the file should be updated. */
+	protected Boolean shouldUpdate(Session clientSession, String nodePath) {
+		return false;
+	}
+
+	public void setJcrRepository(Repository jcrRepository) {
+		this.jcrRepository = jcrRepository;
+	}
+
+	public void setProxyWorkspace(String localWorkspace) {
+		this.proxyWorkspace = localWorkspace;
+	}
+
+}