快速缓存来自Google Cloud Storage的图像流 [英] Express caching Image stream from Google Cloud Storage

问题描述

我正在使用Express 4提供图像流:

I am serving image stream using express 4 with :

app.get('/v1/images/:Uid/', function(req, res) {
    var gcsbucket = gcs.bucket('bucket'),
    remoteReadStream = gcsbucket.file(req.params.Uid+'.jpg').createReadStream();
    remoteReadStream.pipe(res);
});

(图像存储在Google云存储中)

(the images are stored on Google cloud storage)

我正在尝试找到一种方法来告诉浏览器缓存我正在提供的图像. 我尝试添加:

I am trying to find a way to tell browsers to cache the images I am serving. I tried to add :

res.set('Cache-Control', 'public, max-age=31557600');

但是当我在 http://server/v1/images/1234 ，它将始终重新加载图像.

But this is not changing anything when I access the API at http://server/v1/images/1234, it always reload the image.

使用流服务器端时告诉浏览器缓存响应的正确方法是什么?

What is the proper way to tell browsers to cache the response when using stream server-side ?

推荐答案

这实际上是有效的:

app.get('/v1/images/:Uid/', function(req, res) {
    var gcsbucket = gcs.bucket('bucket'),
    remoteReadStream = gcsbucket.file(req.params.Uid+'.jpg').createReadStream();
    res.set('Cache-Control', 'public, max-age=31557600');
    remoteReadStream.pipe(res);
});

奇怪的是，当您直接访问API时，浏览器永远不会缓存.但是，当您将图像嵌入到html页面(如:

Strangely, the browser never cache when you access directly the API. However the image is cached when you embed it in an html page like :

<img src="http://server/v1/images/1234">

对于我的用例来说已经足够了，但是如果有人有理由吗?

It is enough for my use case but if someone has the reason why ?

这篇关于快速缓存来自Google Cloud Storage的图像流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！