How to use the gidgethub.sansio.create_headers function in gidgethub

async def _make_request(self, method: str, url: str, url_vars: Dict[str, str],
                            data: Any, accept: str,
                            jwt: Opt[str] = None,
                            oauth_token: Opt[str] = None,
                            ) -> Tuple[bytes, Opt[str]]:
        """Construct and make an HTTP request."""
        if oauth_token is not None and jwt is not None:
            raise ValueError("Cannot pass both oauth_token and jwt.")
        filled_url = sansio.format_url(url, url_vars)
        if jwt is not None:
            request_headers = sansio.create_headers(
                self.requester, accept=accept,
                jwt=jwt)
        elif oauth_token is not None:
            request_headers = sansio.create_headers(
                self.requester, accept=accept,
                oauth_token=oauth_token)
        else:
            # fallback to using oauth_token
            request_headers = sansio.create_headers(
                self.requester, accept=accept,
                oauth_token=self.oauth_token)
        cached = cacheable = False
        # Can't use None as a "no body" sentinel as it's a legitimate JSON type.
        if data == b"":
            body = b""
            request_headers["content-length"] = "0"

def create_gh_pr(self, base_branch, head_branch, *, commit_message, gh_auth):
        """
        Create PR in GitHub
        """
        request_headers = sansio.create_headers(self.username, oauth_token=gh_auth)
        title, body = normalize_commit_message(commit_message)
        if not self.prefix_commit:
            title = f"[{base_branch}] {title}"
        data = {
            "title": title,
            "body": body,
            "head": f"{self.username}:{head_branch}",
            "base": base_branch,
            "maintainer_can_modify": True,
        }
        url = CREATE_PR_URL_TEMPLATE.format(config=self.config)
        response = requests.post(url, headers=request_headers, json=data)
        if response.status_code == requests.codes.created:
            click.echo(f"Backport PR created at {response.json()['html_url']}")
        else:
            click.echo(response.status_code)

def comment_on_pr(repo_full_name, issue_number, message):
    """
    Leave a comment on a PR/Issue
    """
    request_headers = sansio.create_headers(
        os.environ.get("GH_USERNAME"), oauth_token=os.getenv("GH_AUTH")
    )
    issue_comment_url = (
        f"https://api.github.com/repos/{repo_full_name}/issues/{issue_number}/comments"
    )
    data = {"body": message}
    response = requests.post(issue_comment_url, headers=request_headers, json=data)
    if response.status_code == requests.codes.created:
        print(f"Commented at {response.json()['html_url']}, message: {message}")
    else:
        print(response.status_code)
        print(response.text)

def create_gh_pr(self, base_branch, head_branch, *,
                     commit_message,
                     gh_auth):
        """
        Create PR in GitHub
        """
        request_headers = sansio.create_headers(
            self.username, oauth_token=gh_auth)
        title, body = normalize_commit_message(commit_message)
        if not self.prefix_commit:
            title = f"[{base_branch}] {title}"
        data = {
          "title": title,
          "body": body,
          "head": f"{self.username}:{head_branch}",
          "base": base_branch,
          "maintainer_can_modify": True
        }
        response = requests.post(CPYTHON_CREATE_PR_URL, headers=request_headers, json=data)
        if response.status_code == requests.codes.created:
            click.echo(f"Backport PR created at {response.json()['html_url']}")
        else:
            click.echo(response.status_code)

def close_issue(repo_full_name, issue_number):
    username = os.environ.get("GH_USERNAME")
    gh_auth = os.environ.get("GH_AUTH")

    request_headers = sansio.create_headers(username, oauth_token=gh_auth)

    data = {"state": "closed"}
    url = f"https://api.github.com/repos/{repo_full_name}/issues/{issue_number}"
    response = requests.patch(url, headers=request_headers, json=data)
    if response.status_code == requests.codes.created:
        print(f"PR created at {response.json()['html_url']}")
    else:
        print(response.status_code)
        print(response.text)