From: Brian Candler <b.candler@...>
Date: 2010-09-15T06:46:22+09:00
Subject: Re: HTTP POST

Noel Mc grath wrote:
> If 
> you look at the HTTP response it has the following two objects - resp, 
> responsedata.

This one had me stumped for a while.

Actually, it returns only one object. But that object has a to_ary 
method, which is called in the case of multiple assignment.

So:

  res1 = http.post(...)

just gets the response object. But

  res1, res2 = http.post(...)

is doing an implicit splat, which calls to_ary, which turns it into 
[self, self.body], and those two values get assigned to res1 and res2.

This is extremely sneaky, and the code issues a warning if you run ruby 
with the -w flag (which you should always do)

    # For backward compatibility.
    # To allow Net::HTTP 1.1 style assignment
    # e.g.
    #    response, body = Net::HTTP.get(....)
    #
    def to_ary
      warn "net/http.rb: warning: Net::HTTP v1.1 style assignment found 
at #{caller(1)[0]}; use `response = http.get(...)' instead." if $VERBOSE
      res = self.dup
      class << res
        undef to_ary
      end
      [res, res.body]
    end

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