http feature proposal: specifying which pid should receive async responses

Vincent de Phily <>
Thu Jul 9 14:25:17 CEST 2009


(Re-sending here what I sent to erlang-questions, as this list seems more 
appropriate.)

Hi,

currently, http:request(...{sync,false}...) returns responses to the calling 
process. This is not allways convenient : sometimes we want another process 
to receive the response. It's possible work around this using spawn/receive 
machinery, but that's pointlessly painfull.

This patch adds a 'reply_pid' option to http:request(), cleanly solving the 
problem :

--- src/http.erl~    2009-06-12 12:04:35.000000000 +0200
+++ src/http.erl     2009-07-08 18:53:47.000000000 +0200
@@ -284,6 +284,7 @@

     HTTPRecordOptions = http_options(HTTPOptions, #http_options{}),
     Sync = proplists:get_value(sync, Options, true),
+    ReplyPid = proplists:get_value(reply_pid, Options, self()),
     NewHeaders = lists:map(fun({Key, Val}) ->
                                   {http_util:to_lower(Key), Val} end,
                           Headers),
@@ -296,7 +297,7 @@
        _ ->
            RecordHeaders = header_record(NewHeaders, #http_request_h{},
                                          Host, Version),
-           Request = #request{from = self(),
+           Request = #request{from = ReplyPid,
                               scheme = Scheme,
                               address = {Host,Port},
                               path = Path,


The documentation would need to be updated too, but I'm not sure where to 
patch that.

-- 
Vincent de Phily
Mobile Devices
+33 (0) 666 301 306
+33 (0) 142 119 325

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