Incorrect HTTP method in response message and duplicate Link header when creating a container

curl -iX POST -H'Link: <http://www.w3.org/ns/ldp#BasicContainer>; rel="type"' https://example.org/

HTTP/2 415
link: <.acl>; rel="acl", <.meta>; rel="describedBy", <http://www.w3.org/ns/ldp#Container>; rel="type", <http://www.w3.org/ns/ldp#BasicContainer>; rel="type"

PUT request require a valid content type via the Content-Type header

Note POST request but PUT in response message.

curl -iX POST -H'Content-Type: text/turtle' -H'Link: <http://www.w3.org/ns/ldp#BasicContainer>; rel="type"' https://example.org/

HTTP/2 201
location: /c4db39a0-2bc3-11ea-b34b-d1f743b7eb53/
link: <.acl>; rel="acl", <.meta>; rel="describedBy", <http://www.w3.org/ns/ldp#Container>; rel="type", <http://www.w3.org/ns/ldp#BasicContainer>; rel="type", <http://www.w3.org/ns/ldp#BasicContainer>; rel="type"

Created

Note duplicate LDP-BC rel=type. Same as https://github.com/solid/node-solid-server/issues/426

Start by reproducing both POST requests from the issue and trace the container-creation HTTP handling in the NodeJS server. Confirm that the error message names POST rather than PUT, and that the response emits the LDP BasicContainer type only once in the Link header.