谷歌或亚马逊向Google Home/Amazon Echo传输内容时是否进行缓存？

Great question—let’s break this down for both platforms, since their behaviors follow standard web caching rules with some platform-specific nuances:

Google Home #

When delivering audio to Google Home devices via your own CDN, Google’s infrastructure may cache your audio content, but this is entirely governed by the HTTP cache control headers your CDN returns:

• If your response includes Cache-Control headers that allow caching (e.g., max-age=3600, public), Google’s edge nodes (integrated with their broader content delivery network) will cache the audio for the specified duration. Subsequent requests for the same audio will pull from Google’s cache instead of hitting your CDN directly, reducing latency and your infrastructure load.
• If you set restrictive headers like no-cache or no-store, Google will skip caching entirely. The audio will route directly from your CDN to the user’s Google Home device without being stored in Google’s network.

Google doesn’t cache audio content without explicit permission via these headers, and cached content is purged once the expiration window passes.

Amazon Echo #

For Amazon Echo devices, the logic is nearly identical, centered around Amazon’s Alexa Delivery Network (ADN):

• If your self-hosted CDN returns cache-friendly headers, Amazon’s edge nodes will store the audio content temporarily. This optimizes repeat requests for the same audio, making delivery faster for end users.
• If your headers prohibit caching, the audio travels directly from your CDN to the Echo device, with no intermediate caching in Amazon’s network.

Just like Google, Amazon strictly adheres to HTTP caching standards here—you retain full control over whether your content gets cached in their delivery pipeline.

Key Takeaway #

In both cases, caching isn’t a default platform behavior; it’s dictated by the cache control policies you set on your own CDN responses. If you want to ensure audio is delivered directly from your CDN to the device without any intermediate caching, configure your headers to explicitly block it.

内容的提问来源于stack exchange，提问作者Doug Chase