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my $res = $ua->request(POST $url,
                       'user-agent'                  => 'Mozilla/5.0',
...
#-- not required:      'content-type'                => 'application/x
+-www-form-urlencoded',
                      );

POST /xxx HTTP/1.1
TE: deflate,gzip;q=0.3
...
csrf_token: 28020000006.....
member_verbosity_threshold: 0

 my $res2 = $ua->request(POST $url,
                       'user-agent'                  => 'Mozilla/5.0',
...
#-- not in header:     ':csrf_token'                 => '28020000006..
+...',
                       Content                       => [ csrf_token =
+> '28020000006.....', ]  #-- but in body
                      );

POST /xxx HTTP/1.1
TE: deflate,gzip;q=0.3
...
member_verbosity_threshold: 0

csrf_token=28020000006.....