最近有用户老是反应我们的小程序打开白屏，我们在排查首页加载速度的时候，做了个埋点。统计了一下请求数据，其中一个是http code，惊奇的发现没有304，全是200

奇怪的是，我们的后台已经对多数数据变化不大的接口调用做了etag和last modified支持，而且我们在开发者工具调试的时候也发现这个机制是正常的。

我们的代码

/**          * ajax请求          * [@param](/user/param) {Object} [请求选项，见request API]          */         ajax = (options = {}) => {                 if (!options.url) return;                 options.url = `${config.ajaxURL}${options.url}`;                 let fn = options.success,                         error = options.fail;                 options.success = res => {                         if (res.statusCode == 200) {                                 if (res.data.status == -11) {                                         getApp().globalData.login(() => {                                                 wx.redirectTo({                                                         url: $.history().fullPath,                                                 });                                         });                                         return;                                 }                                 if (res.data.status == 0 && typeof fn === 'function') return fn(res.data);                                 if (typeof error === 'function') error(res.data);                         } else if (typeof error === 'function') error(res.data);                 };                 options.fail = res => {                         console.log(res);                         wx.showToast({                                 title: res.data,                                 icon: 'loading',                         });                         if (typeof error === 'function') error(res);                 }                 wx.request($.extend(true, options, {                         header: {                                 "content-type": "application/x-www-form-urlencoded",                                 sk: (wx.getStorageSync('user') || {}).session_key,                         },                 }));         };

我们就采用真机抓包发现，在真实的手机上，一点作用都没有，每次都是直接200，请求的头里面也没有带etag上去

文档里也没有对这块做说明，要知道这套机制能显著的增强用户前端的体验，麻烦官方给个说明。如果是bug请修复。