Fuseki UI: Uploading a triples file to a named graph is "Bad Request".

On the "add data" tab, if the graph name is set to "http://example/graphname" in the UI, a file upload to the server returns "400 Bad request".

Chrome dev tools show the POST as:

http://localhost:3030/ds/data?graph=http:/example/graphname

The request ends up as ?graph=http:/example/graphname with one slash.

Using three /// in the graph name also produces a single-slash graph=.

Using http:%2F/example/graphname does send the data successfully to the named graph.

(This is not an encoding issue - the query string is right without encoding. "/" and ":" are valid in the query string of a URI.)