def request_post(path, data, initheader = nil, &block) # :yield: +response+
      request Post.new(path, initheader), data, &block
    end
Sends a POST request to the +path+.

Returns the response as a Net::HTTPResponse object.

When called with a block, the block is passed an HTTPResponse
object.  The body of that response will not have been read yet;
the block can process it using HTTPResponse#read_body, if desired.

Returns the response.

This method never raises Net::* exceptions.

# example
response = http.request_post('/cgi-bin/nice.rb', 'datadatadata...')
p response.status
puts response.body          # body is already read in this case

# using block
http.request_post('/cgi-bin/nice.rb', 'datadatadata...') {|response|
p response.status
p response['content-type']
response.read_body do |str|   # read body now
print str
end
}