HTTP methods with '-' char

[George Fleury]

Hi all, 

i'm porting apache https mod_cluster to NGINX, however the methods used for internal control mod_cluster 
use the character '-' (ex: ENABLE-APP), and for NGINX these methods are invalid because of character '- ‘. 
Now comes my doubts, gave a quick read in RFCs 2616 and 822 and found nothing saying that the '-' character 
can not be used in token methods of http/1.1. Is that right or there is a reason?