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@@ -12,10 +12,16 @@ require 'rexml/xpath'
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 module AwsSdb
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   class Service
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-    def initialize(logger, access_key_id, secret_access_key)
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+    def initialize(
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+        logger, 
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+        access_key_id, 
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+        secret_access_key, 
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+        url = "http://sds.amazonaws.com"
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+      )
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       @logger = logger
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       @access_key_id = access_key_id 
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       @secret_access_key = secret_access_key
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+      @base_url = url
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     end
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     def list_domains(max = nil, token = nil)
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@@ -133,7 +139,7 @@ module AwsSdb
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       signature = Base64.encode64(hmac).strip
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       query << "Signature=#{CGI::escape(signature)}"
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       query = query.join('&')
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-      url = "http://sds.amazonaws.com?#{query}"
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+      url = "#{@base_url}?#{query}"
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       uri = URI.parse(url)
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       @logger.debug("#{url}") if @logger
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       response =