Recommend a site to share sample data with vega-editor to overcome the problem of "No 'Access-Control-Allow-Origin' header is present"? - vega-lite

Question

To demonstrate my problems, I'd share the sample data at a host, to make vega-lite specification more readable.
I tried gist.github.com, and dropbox.com.
But I always run into the issue of "Loading failed".
Upon examination of the console output, I found the root cause is
"Access to fetch at https://gist.github.com from origin
'https://vega.github.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."
I wonder if there is a site for public sharing/hosting temporarily my sample data that works with vega-editor?
I had wished that given vega-editor is hosted at github.io domain, it might be easier to address the issue.
EDIT: adding the sample specification with data url to gist.github.com
It has the problem.
{
"data": {"url": "https://gist.github.com/yubrshen/37479eb7637007e1ca9d703a5a56a479"},
"mark": "line",
"encoding": {
"x": {"field": "estimating-date-time", "type": "temporal"},
"y": {"field": "ETA-variance", "type": "quantitative"},
"row": {"field": "PLATFORM"}
}
}
EDIT1: try to expression the value to "url" appearing more like a file path:
{
"data": {"url": "https://gist.github.com/yubrshen/37479eb7637007e1ca9d703a5a56a479?file=variances.json"},
"mark": "line",
"encoding": {
"x": {"field": "estimating-date-time", "type": "temporal"},
"y": {"field": "ETA-variance", "type": "quantitative"},
"row": {"field": "PLATFORM"}
}
}
but the issue is still the same.

Answer 1

It appears that github pages is an option; for example the following works in the vega editor:
{
"data": {
"values": [
{"x": 0.5, "y": 0.5, "img": "https://vega.github.io/vega-datasets/data/ffox.png"},
{"x": 1.5, "y": 1.5, "img": "https://vega.github.io/vega-datasets/data/gimp.png"},
{"x": 2.5, "y": 2.5, "img": "https://vega.github.io/vega-datasets/data/7zip.png"}
]
},
"mark": {"type": "image", "width": 50, "height": 50},
"encoding": {
"x": {"field": "x", "type": "quantitative"},
"y": {"field": "y", "type": "quantitative"},
"url": {"field": "img", "type": "nominal"}
}
}