def create_content_addressed_github_uri(uri: URI) -> URI:
    """
    Returns a content-addressed Github "git_url" that conforms to this scheme.
    https://api.github.com/repos/:owner/:repo/git/blobs/:file_sha

    Accepts Github-defined "url" that conforms to this scheme
    https://api.github.com/repos/:owner/:repo/contents/:path/:to/manifest.json
    """
    if not is_valid_api_github_uri(uri):
        raise CannotHandleURI(f"{uri} does not conform to Github's API 'url' scheme.")
    response = requests.get(uri)
    response.raise_for_status()
    contents = json.loads(response.content)
    if contents["type"] != "file":
        raise CannotHandleURI(
            f"Expected url to point to a 'file' type, instead received {contents['type']}."
        )
    return contents["git_url"]