Loris doesn't respect the proxy_path setting when creating the Link header

[alexwlchan]

We run Loris with the following setting:

[loris.Loris]
proxy_path = 'https://iiif.wellcomecollection.org/image/'

The proxy_path setting is used to create correct URLs in the info.json, for example:

$ curl 'https://iiif.wellcomecollection.org/image/s3%3AV0000000%2FV0000003.jpg/info.json' 2>/dev/null | jq -r '.["@id"]'
https://iiif.wellcomecollection.org/image/s3%3AV0000000%2FV0000003.jpg

But if you request an image file, the Link header is still poking through the origin URL (which in our case, leads to a 404):

$ curl -o /dev/null -D - 'https://iiif.wellcomecollection.org/image/s3%3AV0000000%2FV0000003.jpg/full/full/0/default.jpg' 2>/dev/null | grep Link
Link: <http://iiif.io/api/image/2/level2.json>;rel="profile",<http://iiif-origin.wellcomecollection.org/s3%3AV0000000%2FV0000003.jpg/full/full/0/default.jpg>;rel="canonical"

Loris should use the proxy_path setting, and rewrite this URL to the following:

http://iiif.wellcomecollection.org/image/s3%3AV0000000%2FV0000003.jpg/full/full/0/default.jpg

We’re seeing this while running with commit df047b4.

[bcail]

Fixed in #395.