rest - 如何使用 Restful 存储防止 Ext JS 在 DELETE 请求中包含实体主体？

Question

当Ext JS从restful store发出DELETE请求时，它包含一个实体主体。虽然这个doesn't seem to be forbidden根据 HTTP 规范，Google App Engine 不接受此类请求。所以我想知道是否有一种方法可以防止 Restful 存储在 DELETE 请求中包含冗余实体主体。

详细信息:

使用此示例作为引用: http://www.sencha.com/deploy/dev/examples/restful/restful.html

这就是商店的定义方式:

var store = new Ext.data.Store({
    id: 'user',
    restful: true,     // <-- This Store is RESTful
    proxy: proxy,
    reader: reader,
    writer: writer
});

按下“删除”按钮后，这是 Ext JS 发送的请求:

DELETE http://www.sencha.com/deploy/dev/examples/restful/app.php/users/6 HTTP/1.1
Host: www.sencha.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; pt-BR; rv:1.9.2.4) Gecko/20100611 Firefox/3.6.4 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: pt-br,pt;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Content-Type: application/json; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://www.sencha.com/deploy/dev/examples/restful/restful.html
Content-Length: 10
Cookie: bb_sessionhash=8d75f5e42d576fb695a02bf1d24c9ff1; etc...

{"data":6}

当这种格式的请求(带有“数据”内容)提交到 Google App Engine 时，它​​会回复:

400 Bad Request

Answer 1

正如您所猜测的，您可以通过重写 HttpProxy 类中的方法来解决此问题。首先，添加以下代码:

// Special HttpProxy that sends no body on DELETE requests
Ext.data.GAEHttpProxy = Ext.extend(Ext.data.HttpProxy, {
doRequest: function(action, rs, params, reader, cb, scope, arg) {
    if(this.api[action]['method'].toLowerCase() == "delete") {
        delete params.jsonData;
    }

    Ext.data.GAEHttpProxy.superclass.doRequest.call(this, action, rs, params, reader, cb, scope, arg);
}
});

然后，在其余代码中使用这个新类(“GAEHttpProxy”)而不是 HttpProxy(例如，当您创建在上面所示的商店中使用的代理时)。这对我有用，我希望它对你有用!