def update_session_headers(session):
session.headers.update({<EOL>'<STR_LIT:Content-Type>': '<STR_LIT>',<EOL>'<STR_LIT>': '<STR_LIT>'<EOL>})<EOL>return session<EOL>
Add content type header to the session.

:param: requests.sessions.Session session: A session.
:return: A session with modified headers.
:rtype: requests.sessions.Session