fetching federal content from lower env

[npeltier]

following @mokimo & @narcis-radu 's advice i moved some json fetch out of milo.adobe.com to www, and we save some DNS fetch time one prod and i'm happy about it (plus authoring bits about it).
However we'll still have some DNS fetch for www from direct EDS accesses, which will give fake negatives on performances.

could we some how e.g. make following URLs working?
https://main--milo--adobecom.hlx.page/federal/commerce/price-literals.json
https://main--milo--adobecom.hlx.live/federal/commerce/price-literals.json
https://main--cc--adobecom.hlx.page/federal/commerce/price-literals.json
https://main--cc--adobecom.hlx.live/federal/commerce/price-literals.json

[mokimo]

There is: https://www.stage.adobe.com/federal/commerce/price-literals.json However, one important caveat is that federal stage isn't set up to point to hlx.page yet (both stage & prod) point to hlx.live.

I'd keep those around, until we properly re-mapped federal to aem.page as part of the helix5 migration - after that I'd suggest to fetch them from www.stage.adobe.com/federal/... (has a dependency on VPN, for authentication since its stage)
https://main--milo--adobecom.hlx.page/federal/commerce/price-literals.json
https://main--cc--adobecom.hlx.page/federal/commerce/price-literals.json

This would be equal to milo.adobe.com, so they should point to www.adobe.com
https://main--milo--adobecom.hlx.live/federal/commerce/price-literals.json
https://main--cc--adobecom.hlx.live/federal/commerce/price-literals.json

[3ch023]

Another suggestion, we could use federal URLs related to the current consumer origin.
e.g.:

• https://main--federal--adobecom.hlx.page on hlx.page consumer
• https://main--federal--adobecom.hlx.live on hlx.live consumer
• https://www.stage.adobe.com/federal on www.stage.adobe consumer
• https://www.adobe.com/federal on www.adobe consumer

This removes magic of switching between stage/prod federal URLs and removes the struggle with authentication to stage.adobe.com if I am on hlx.page/hlx.live consumer page.

export const CHECKOUT_LINK_CONFIG_PATH = '{FEDERAL_URL}/federal/commerce/checkout-link.json';
FEDERAL_URL can come either from milo config or be generated in commerce file

[mokimo]

(consumer) hlx.page to (federal) hlx.page won't work if any authentication is involved. You'd always auth only within the consumer project and lose access to federal.

For now we disabled authentication on the federal project, but for the gnav we fetch from stage.adobe.com to circumvent any MS-Auth issues//401s

[mokimo]

For further context I've posed this question on the EDS discord

[mokimo]

This is how we had done it in the gnav: https://github.com/adobecom/milo/blob/stage/libs/blocks/global-navigation/utilities/utilities.js#L72-L89

Though for now it'd be fine to change L85 to https://main--federal--adobecom.hlx.page