Can't get ETag header from HttpClient response headers

[lyon-liao]

My true question is stackoverflow.

And I can not get full of Http response headers from HttpClient. the stackblitz demo

And If I want to use ETag with JSON file, what is the best way.

[pankajparkar]

This doesn't seems to be Angular specific problem. You have to expose this ETag header from your server configuration, that would fix the issue.

https://stackoverflow.com/questions/21345814/etag-header-not-returned-from-jquery-ajax-cross-origin-xhr

Reference for configuration on server side.

1. Dotnet
2. SpringBoot
3. NodeJS

[lyon-liao]

@pankajparkar Thank you for your reply. The ETag header is in HTTP headers, but not in HttpClient response headers. you can find it in chrome network tool in stackblitz demo

[lyon-liao]

@pankajparkar You are right. I misunderstand the Access-Control-Expose-Headers and I added to the request header. On the face of this issue is cors. Thanks

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