Bitbucket Server throws error when tries to fetch a raw json with Accept: application/json

Summary

Bitbucket Server throws error when tries to fetch a raw json with Accept header (Content-type: application/json) specified

Steps to Reproduce

curl -H "Accept: application/json" -H "Content-type: application/json" -X GET https://<URL>/projects/<project>/repos/<repo>/raw/file.json

Expected Results

It returns the raw contents of the file.

Actual Results

For versions before 5.3.0, this returns 

{"message":"null for uri: https://<URL>/projects/<project>/repos/<repo>/raw/file.json","status-code":404} 

and for versions 5.3.0+, this returns

{"message":"null for uri: https://<URL>/projects/<project>/repos/<repo>/raw/file.json","status-code":500}

Workaround

Replace https://<URL>/projects/<project>/repos/<repo>/raw/file.json with

https://<URL>/mvc/projects/<project>/repos/<repo>/raw/file.json