[SIPForum-discussion] Doubt on section 9.1 of RFC 3841

[sourav dharchaudhuri]

Hi,
  In the section 9.1(Request-Disposition) of RFC 3841 has type of the directive.
 
  definition of parallel directive  & fork directive

fork-directive:
This type of directive indicates whether a proxy should fork a request
("fork"), or proxy to only a single address ("no-fork"). If the server
is requested not to fork, the server SHOULD proxy the request to the
"best" address (generally the one with the highest q-value). If there
are multiple addresses with the highest q-value, the server chooses one
based on its local policy. The directive is ignored if "redirect" has
been requested. 

parallel-directive:
For a forking proxy server, this type of directive indicates whether
the caller would like the proxy server to proxy the request to all
known addresses at once ("parallel"),or go through them sequentially,
contacting the next address only after it has received a non-2xx or
non-6xx final response for the previous one ("sequential"). The
directive is ignored if "redirect" has been requested.



The BNF for Request-Disposition is 

Request-Disposition  =      ( "Request-Disposition" / "d" ) HCOLON
                                        directive *(COMMA directive)
directive                    =      proxy-directive / cancel-directive /
   
                                     fork-directive / recurse-directive /
                                        parallel-directive / queue-directive
proxy-directive          =     "proxy" / "redirect"
cancel-directive         =     "cancel" / "no-cancel"
fork-directive            =    "fork" / "no-fork"
recurse-directive       =     "recurse" / "no-recurse"
parallel-directive       =     "parallel" / "sequential"
queue-directive
         =      "queue" / "no-queue"

Now if a request came with underlying value in Request Disposition header

Request-Disposition: proxy, nofork, parallel

What the proxy will do?

thanks

SOURAV






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