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myStore.on({
    beforeload: {
        fn: function (store, options) {
            // use <tt>{@link Ext.data.HttpProxy#setUrl setUrl}</tt> to change the URL for *just* this request.
            store.proxy.setUrl('changed1.php');

            // set optional second parameter to true to make this URL change
            // permanent, applying this URL for all subsequent requests.
            store.proxy.setUrl('changed1.php', true);

            // Altering the proxy API should be done using the public
            // method <tt>{@link Ext.data.DataProxy#setApi setApi}</tt>.
            store.proxy.setApi('read', 'changed2.php');

            // Or set the entire API with a config-object.
            // When using the config-object option, you must redefine the <b>entire</b>
            // API -- not just a specific action of it.
            store.proxy.setApi({
                read    : 'changed_read.php',
                create  : 'changed_create.php',
                update  : 'changed_update.php',
                destroy : 'changed_destroy.php'
            });
        }
    }
});
     * </code></pre>
     * </p>
     */

    this.addEvents(
        /**
         * @event exception
         * <p>Fires if an exception occurs in the Proxy during a remote request. This event is relayed
         * through a corresponding {@link Ext.data.Store}.{@link Ext.data.Store#exception exception},
         * so any Store instance may observe this event.</p>
         * <p>In addition to being fired through the DataProxy instance that raised the event, this event is also fired
         * through the Ext.data.DataProxy <i>class</i> to allow for centralized processing of exception events from <b>all</b>
         * DataProxies by attaching a listener to the Ext.data.DataProxy class itself.</p>
         * <p>This event can be fired for one of two reasons:</p>
         * <div class="mdetail-params"><ul>
         * <li>remote-request <b>failed</b> : <div class="sub-desc">
         * The server did not return status === 200.
         * </div></li>
         * <li>remote-request <b>succeeded</b> : <div class="sub-desc">
         * The remote-request succeeded but the reader could not read the response.
         * This means the server returned data, but the configured Reader threw an
         * error while reading the response.  In this case, this event will be
         * raised and the caught error will be passed along into this event.
         * </div></li>
         * </ul></div>
         * <br><p>This event fires with two different contexts based upon the 2nd
         * parameter <tt>type [remote|response]</tt>.  The first four parameters
         * are identical between the two contexts -- only the final two parameters
         * differ.</p>
         * @param {DataProxy} this The proxy that sent the request
         * @param {String} type
         * <p>The value of this parameter will be either <tt>'response'</tt> or <tt>'remote'</tt>.</p>
         * <div class="mdetail-params"><ul>
         * <li><b><tt>'response'</tt></b> : <div class="sub-desc">
         * <p>An <b>invalid</b> response from the server was returned: either 404,
         * 500 or the response meta-data does not match that defined in the DataReader
         * (e.g.: root, idProperty, successProperty).</p>
         * </div></li>
         * <li><b><tt>'remote'</tt></b> : <div class="sub-desc">
         * <p>A <b>valid</b> response was returned from the server having
         * successProperty === false.  This response might contain an error-message
         * sent from the server.  For example, the user may have failed
         * authentication/authorization or a database validation error occurred.</p>
         * </div></li>
         * </ul></div>
         * @param {String} action Name of the action (see {@link Ext.data.Api#actions}.
         * @param {Object} options The options for the action that were specified in the {@link #request}.
         * @param {Object} response
         * <p>The value of this parameter depends on the value of the <code>type</code> parameter:</p>
         * <div class="mdetail-params"><ul>
         * <li><b><tt>'response'</tt></b> : <div class="sub-desc">
         * <p>The raw browser response object (e.g.: XMLHttpRequest)</p>
         * </div></li>
         * <li><b><tt>'remote'</tt></b> : <div class="sub-desc">
         * <p>The decoded response object sent from the server.</p>
         * </div></li>
         * </ul></div>
         * @param {Mixed} arg
         * <p>The type and value of this parameter depends on the value of the <code>type</code> parameter:</p>
         * <div class="mdetail-params"><ul>
         * <li><b><tt>'response'</tt></b> : Error<div class="sub-desc">
         * <p>The JavaScript Error object caught if the configured Reader could not read the data.
         * If the remote request returns success===false, this parameter will be null.</p>
         * </div></li>
         * <li><b><tt>'remote'</tt></b> : Record/Record[]<div class="sub-desc">
         * <p>This parameter will only exist if the <tt>action</tt> was a <b>write</b> action
         * (Ext.data.Api.actions.create|update|destroy).</p>
         * </div></li>
         * </ul></div>
         */
        'exception',
        /**
         * @event beforeload
         * Fires before a request to retrieve a data object.
         * @param {DataProxy} this The proxy for the request
         * @param {Object} params The params object passed to the {@link #request} function
         */
        'beforeload',
        /**
         * @event load
         * Fires before the load method's callback is called.
         * @param {DataProxy} this The proxy for the request
         * @param {Object} o The request transaction object
         * @param {Object} options The callback's <tt>options</tt> property as passed to the {@link #request} function
         */
        'load',
        /**
         * @event loadexception
         * <p>This event is <b>deprecated</b>.  The signature of the loadexception event
         * varies depending on the proxy, use the catch-all {@link #exception} event instead.
         * This event will fire in addition to the {@link #exception} event.</p>
         * @param {misc} misc See {@link #exception}.
         * @deprecated
         */
        'loadexception',