Uniprot record retrieval not working in JalviewJS

Looks like Jalview's Uniprot client isn't gracefully handling redirects when retrieving Uniprot records via the plain old accession retriever.

Error appears to be a CORS issue, but in reality is probably due to the 301:
swingjs2.js:10545 Access to XMLHttpRequest at 'https://www.uniprot.org/uniprot/P00340.xml' from origin 'https://builds.jalview.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.