sample code of supporting to S3's GET link with response-* params

gistfile1.rb

# see https://github.com/rightscale/right_aws/pull/47 for more details

# Traditional way, without headers and response-* params
s3instance.get_link('bucket_name', 'key/song.mp3', 86400)
#=> https://bucket_name.s3.amazonaws.com:443/key%2Fsong.mp3?Signature=vIh5...&Expires=1296611902&AWSAccessKeyId=AK...

# To generate url with response-* params, headers parameter must be specified,
# and response-* params are in hash style
s3instance.get_link('bucket_name', 'key/song.mp3', 86400, 
  {}, # empty additional headers
  {
    "response-content-disposition" => "attachment; filename=good_song.mp3", # specify Content-disposition and filename
    "response-cache-control"=>"No-cache" # specify Cache-control
  }
)
#=> https://bucket_name.s3.amazonaws.com:443/key%2Fsong.mp3?response-cache-control=No-cache&response-content-disposition=attachment; filename=good_song.mp3&Signature=7TLD...&Expires=1296611902&AWSAccessKeyId=AK...