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[7.x] Forward any registry cache-control header for files (#83680) #84172

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merged 1 commit into from
Nov 24, 2020

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jfsiii
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@jfsiii jfsiii commented Nov 24, 2020

Backports the following commits to 7.x:

closes #83631 

### Problem
Assets are served with a `cache-control` header that prevents any caching
<img src="https://user-images.githubusercontent.com/640/99534379-517d2300-2975-11eb-8c05-4fb3f127c52b.png"/>

### Root cause
Likely from this code https://github.com/elastic/kibana/blob/2a365ff6329544465227e61141ded6fba8bb2c80/src/core/server/http/http_tools.ts#L40-L43

Also based on these tests, it seems this is default/expected behavior

https://github.com/elastic/kibana/blob/b3eefb97da8e712789b5c5d2eeae65c886ed8f64/src/core/server/http/integration_tests/router.test.ts#L510-L520

### Proposed solution
Set the header via the response handler as shown in this test:
https://github.com/elastic/kibana/blob/b3eefb97da8e712789b5c5d2eeae65c886ed8f64/src/core/server/http/integration_tests/router.test.ts#L522-L536

### This PR
If this registry response contains a `cache-control` header, that value is included in the EPM response as well

In `master`, which points to `epr-snapshot`
<img width="742" alt="Screen Shot 2020-11-18 at 12 33 47 PM" src="https://user-images.githubusercontent.com/57655/99568352-4fc75580-299d-11eb-962f-6ff28fa9510d.png">
which matches https://epr-snapshot.elastic.co/package/apache/0.2.6/img/logo_apache.svg

or using `epr.elastic.co`, 
<img width="781" alt="Screen Shot 2020-11-18 at 12 31 56 PM" src="https://user-images.githubusercontent.com/57655/99568350-4fc75580-299d-11eb-966e-f3489c13edb5.png">
which matches https://epr.elastic.co/package/apache/0.2.6/img/logo_apache.svg
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💚 Build Succeeded

Metrics [docs]

✅ unchanged

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

@jfsiii jfsiii merged commit e7d56a7 into elastic:7.x Nov 24, 2020
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