Live demo of datasette-vega seems to have problems with cors

[dannyob]

When I got to https://datasette-vega-latest.datasette.io/ and click on the button with the pre-set URL in the text entry form, the show charting button that appears doesn't do anything (apart from disappear) when you click on it.

Checking the javascript console log shows me this:

Access to fetch at 'https://fivethirtyeight.datasettes.com/fivethirtyeight-45d758d/nba-elo%2Fnbaallelo.json?_shape=array&_shape=array' from origin 'https://datasette-vega-latest.datasette.io' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
DatasetteVega.js:76          GET https://fivethirtyeight.datasettes.com/fivethirtyeight-45d758d/nba-elo%2Fnbaallelo.json?_shape=array&_shape=array net::ERR_FAILED 302
value @ DatasetteVega.js:76
dr @ react-dom.production.min.js:219
fr @ react-dom.production.min.js:212
cr @ react-dom.production.min.js:211
ur @ react-dom.production.min.js:211
ir @ react-dom.production.min.js:209
Zn @ react-dom.production.min.js:207
Or @ react-dom.production.min.js:224
jr @ react-dom.production.min.js:225
Tr.render @ react-dom.production.min.js:232
(anonymous) @ react-dom.production.min.js:236
mr @ react-dom.production.min.js:222
Ar @ react-dom.production.min.js:236
render @ react-dom.production.min.js:238
(anonymous) @ index.js:58
DatasetteVega.js:76                  Uncaught (in promise) TypeError: Failed to fetch
    at t.value (DatasetteVega.js:76:5)
    at dr (react-dom.production.min.js:219:329)
    at fr (react-dom.production.min.js:212:214)
    at cr (react-dom.production.min.js:211:277)
    at ur (react-dom.production.min.js:211:113)
    at ir (react-dom.production.min.js:209:244)
    at Zn (react-dom.production.min.js:207:316)
    at Or (react-dom.production.min.js:224:426)
    at jr (react-dom.production.min.js:225:215)
    at Tr.render (react-dom.production.min.js:232:351)
value @ DatasetteVega.js:76
dr @ react-dom.production.min.js:219
fr @ react-dom.production.min.js:212
cr @ react-dom.production.min.js:211
ur @ react-dom.production.min.js:211
ir @ react-dom.production.min.js:209
Zn @ react-dom.production.min.js:207
Or @ react-dom.production.min.js:224
jr @ react-dom.production.min.js:225
Tr.render @ react-dom.production.min.js:232
(anonymous) @ react-dom.production.min.js:236
mr @ react-dom.production.min.js:222
Ar @ react-dom.production.min.js:236
render @ react-dom.production.min.js:238
(anonymous) @ index.js:58
Promise.then (async)
value @ DatasetteVega.js:76
dr @ react-dom.production.min.js:219
fr @ react-dom.production.min.js:212
cr @ react-dom.production.min.js:211
ur @ react-dom.production.min.js:211
ir @ react-dom.production.min.js:209
Zn @ react-dom.production.min.js:207
Or @ react-dom.production.min.js:224
jr @ react-dom.production.min.js:225
Tr.render @ react-dom.production.min.js:232
(anonymous) @ react-dom.production.min.js:236
mr @ react-dom.production.min.js:222
Ar @ react-dom.production.min.js:236
render @ react-dom.production.min.js:238
(anonymous) @ index.js:58

recording.mp4