[erlang-bugs] httpc:request_cancel oddities

[Chris King]

Furthermore, there's a race condition in the cancel_request handler here:

     case ets:lookup(HandlerDb, RequestId) of
[...snip...]
     [{_, Pid, _}] ->
         httpc_handler:cancel(RequestId, Pid, From),
         {noreply,
          State#state{cancel =
                      [{RequestId, Pid, From} | State#state.cancel]}}

After the ets:lookup, thread death & reuse races with  
httpc_handler:cancel.  The handler thread then dies when it receives a  
cancel message for an unknown request.  Easiest (and probably most  
correct) solution is for the handler thread to ignore cancel messages for  
unknown requests, rather than dying with function_clause as it currently  
does.