Improve identifying FT locations

Incident:

Use Vrij University Amsterdam to test this in Production

Visit https://www-sciencedirect-com.vu-nl.idm.oclc.org/science/article/pii/S2352464219302482?via%3Dihub(Creds are in Keeper)

Once logged in and landed on the final location, you will see an Alternaitves popup

Click the popup, Note that youa re redirected back to the same page. This keeps happening....

Why causes this redirection loop?

• When the LL extension calls VU's Link resolver for the FT location, it peovides the below as the URL to find the FT location of the article
  https://linker2.worldcat.org/?date=2019&wskey=3l9DKg74bWPVh1FswIPVpSoDDZGgfCLrtz9MQbaHXDxcgXOVrjcc6ZTdvWQNyHPsXGUABCbeZMUHeNcB&aulast=Bjerregaard&issue=11&jKey=23524642&rft.institution_id=67271&linktype=best&spage=752&eissn=2352-4650&title=Lancet%20Child%20and%20Adolescent%20Health%2C%20The&localstem=https%3A%2F%2Fvu-nl.idm.oclc.org%2Flogin%3Furl%3D&atitle=Are%20we%20approaching%20a%20better%20definition%20of%20childhood%20obesity%3F&volume=3&linkScheme=sciencedirect&jHome=https%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Fjournal%2F23524642&url_ver=Z39.88-2004&issn=2352-4642&provider=elsevier&pkgName=sciDirect&rft.au=Lise%20G%20Bjerregaard&linkclass=to_article&jHomeSig=46b15c889d4fe0e36ec542837ecf84d2d7cde2c8ceba4fd83ff0cc8b8dd89134&doi=10.1016%2FS2352-4642%2819%2930248-2

• This URL resolves to https://linkinghub-elsevier-com.vu-nl.idm.oclc.org/retrieve/pii/S2352464219302482 as the FT location in extension's eye.

• You are seeing the Alternatives pop-up due to the differences between the domains (On location and Suggested FT location domains)

• However, the https://linkinghub-elsevier-com.vu-nl.idm.oclc.org/retrieve/pii/S2352464219302482 location auto redirects the user back to https://www-sciencedirect-com.vu-nl.idm.oclc.org/science/article/pii/S2352464219302482?via%3Dihub

• This creates an infinite loop, which is misleading to the end user.

Libraries do not have total control over changing the FT location in their holdings system to match the final redirection URL.

In order to provide accurate Alternatives responses, the Lean Library extension should be able to understand/ handle such use cases better, as this seems to happen across all types of Link resolvers.