firebase - 需要帮助了解 Firebase 存储 CDN

Question

我正在构建一个有声读物应用程序并将音频文件上传到 Firebase 存储。我的问题是我在旧金山和多伦多的表现不同。我的印象是 Firebase Storage 具有内置 CDN。如果是这样，我是否需要在某处启用它？如果没有，我如何将 GCP CDN 添加到 Firebase Auth 后面的 Firebase 存储文件中？

检查域storage.googleapis.com我的 Firebase 存储文件所在的位置表明它正在使用 Google CDN。

以下是我的公共(public)音频文件请求之一的响应 header :

accept-ranges: bytes
alt-svc: quic=":443"; ma=2592000; v="46,44,43,39"
cache-control: public, max-age=3600
content-disposition: inline; filename*=utf-8''G4PT7dPIyEuIz74BtTmm_FallIsTheLastSeasonOfTheYear.mp3
content-length: 3162637
content-type: audio/mp3
date: Tue, 30 Apr 2019 17:13:34 GMT
etag: "98013599e6f108a0edeeaac7c8b2bb45"
expires: Tue, 30 Apr 2019 18:13:34 GMT
last-modified: Mon, 08 Apr 2019 17:59:58 GMT
server: UploadServer
status: 200
x-goog-generation: 1554746398034230
x-goog-hash: crc32c=TKSAfA==, md5=mAE1mebxCKDt7qrHyLK7RQ==
x-goog-meta-firebasestoragedownloadtokens: da578546-c265-4f06-ae11-6273a7812bf2
x-goog-metageneration: 2
x-goog-storage-class: STANDARD
x-goog-stored-content-encoding: identity
x-goog-stored-content-length: 3162637
x-guploader-uploadid: AEnB2UqdvgzkJMC0yHJkGbr-K5cWWbXK5I2j6NLtd4NwG1G9swIhhp1QC8G25JUK4LItZID0IxuYhhLta3YImMTtzbKkr5vcEQ

Answer 1

我联系了 Firebase 支持，这是我得到的答案:

Regarding the CDN question, the short answer is no, Cloud Storage has no built-in CDN; the less short answer is: when your Cloud Storage is "multi-regional", it means that "hot content" (frequently accessed content) is available on different locations, but that is limited to multi-regional locations, and it applies only to the "jurisdiction" of the location, so, for example, if your project is in "us-central", then your multi-regional Storage will be stored only in the US data centers, so when accessed from Toronto, it will be served from the nearest US datacenter.

Now, there are ways to add a CDN to Cloud Storage content; I found this small guide using Google CDN: https://medium.com/@marco_37432/create-a-custom-domain-cdn-with-google-beta-7ad9531dfbae

Another use that I have seen is creating a static website with Cloud Storage and adding on top another CDN provider, like CloudFlare. You can see more details in this links:

https://cloudplatform.googleblog.com/2015/09/push-google-cloud-origin-content-out-to-users.html https://cloud.google.com/interconnect/docs/how-to/cdn-interconnect