code: public byte[] getRawBlobContent(GitlabProject project, String sha) throws IOException {
          String tailUrl = GitlabProject.URL + "/" + project.getId() + "/repository/blobs/" + sha + "/raw";
          return retrieve().to(tailUrl, byte[].class);
      }
docs: Get the raw file contents for a blob by blob SHA.
  
  @param project The Project
  @param sha     The commit or branch name
  @throws IOException on gitlab api call error