def build_authorization_arg(authdict):
vallist = []<EOL>for k in list(authdict.keys()):<EOL><INDENT>vallist += ['<STR_LIT>' % (k,authdict[k])]<EOL><DEDENT>return '<STR_LIT>'+'<STR_LIT:U+002CU+0020>'.join(vallist)<EOL>
Create an "Authorization" header value from an authdict (created by generate_response()).