如何使用etags进行缓存? [英] How to use etags for caching?

问题描述

谁能告诉我如何为这个网址正确传递 etag?

Can anyone tell me how to pass etag correctly for this url?

https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,id&playlistId=UUwpy_3CqtfwM7tg2JgQQQyA&maxResults=50&key={API_KEY}.

我就是这样通过的，但没有成功.

I was passing like this, but didn't work.

https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,id&playlistId=UUwpy_3CqtfwM7tg2JgQQQyA&maxResults=50&key={API_KEY}&If-None-Match="p4VTdlkTEZAYKyrbhtlvLebhtwLevLevLevLevLys

https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,id&playlistId=UUwpy_3CqtfwM7tg2JgQQQyA&maxResults=50&key={API_KEY}&If-None-Match="p4VTdlkQv3HQeTEaXgvLePAydmU/vKZr9jiSytaO7UdTbhKbIrwbX20"

推荐答案

If-None-Match 是请求头，而不是查询参数.需要在请求的 headers 中设置此标头.https://developer.mozilla.org/en-US/文档/Web/API/XMLHttpRequest/setRequestHeader

If-None-Match is request header, and not query param. Need set this header in headers of request. https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader

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