如何从Google Cloud Functions发送gzip格式的json响应? [英] How to send gzipped json response from Google Cloud Functions?

问题描述

如果我使用gzip压缩进行响应，那么我在其中一个Google Cloud Functions中的JSON响应的大小最多可以减少70-80％.

My JSON responses in one of my Google Cloud Functions could be reduced up to 70-80% in size if I respond using gzip compression.

如何从我的函数(通过http(s)触发)发送压缩的json响应?

How can I send a compressed json response from my Functions (trigger via http(s))?

这还意味着我可以节省Google云端平台的大量网络费用，并为数据的移动用户更快地加载数据.

This would also mean I would save on a lot of network expenses with google cloud platform, and a faster loading of the data for mobile consumers of the data.

我尝试使用zlib本机模块，但是没有运气...

I've tried using the zlib native module but no luck...

if (req.get('Accept-Encoding') && req.get('Accept-Encoding').indexOf('gzip') > -1) {

    interpretation.gzip = true;

    const zlib = require('zlib');

    res.set('Content-Type', 'text/plain');
    res.set('Content-Encoding', 'gzip');

    zlib.gzip(JSON.stringify(interpretation), function (error, result) {
        if (error) throw error;
        res.status(200).send(result);
    })

} else {
    interpretation.gzip = false;
    res.status(200).send(interpretation);
}

在Postman中，响应的大小相同，内容类型已更改，但是响应中没有设置Content-Encoding标头...

In Postman, the size of the response is the same, the content-type has changed, but there is no Content-Encoding header set in the response...

推荐答案

查看 App Engine常见问题解答，特别是以下问题的答案:"我如何提供压缩内容?":

Look at the App Engine FAQ, specifically the answer to the question "How do I serve compressed content?":

....为强制提供压缩后的内容，客户可以提供"gzip"作为 Accept-Encoding 和 用户代理请求标头.如果没有 Accept-Encoding 标头，则永远不会压缩内容.

....To force gzipped content to be served, clients may supply 'gzip' as the value of both the Accept-Encoding and User-Agent request headers. Content will never be gzipped if no Accept-Encoding header is present...

此外，在此论坛帖子中，有一个示例如何使用Accept-Encoding，User-Agent和

Also, in this group post there's an example of how to send a request with Cloud Functions using the combination of Accept-Encoding, User-Agent:

curl -v "https://us-central1-<project>.cloudfunctions.net/test" -H "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36" -H "Accept-Encoding: gzip"

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