Welcome to Download Delivery

Download Delivery (DD) is a reliable, high performance file-based content delivery solution optimized to deliver large (>100MB) file-based content over the Internet.

DD is built on the globally distributed Akamai Intelligent Platform™ for superior capacity, scalability, availability, and performance. It helps you deliver your progressive media files quickly and reliably to users anywhere in the world. It provides performance, efficiency and stability through "Large File Optimization." This reduces latency and enhances performance when delivering large files.

DD gains stability and performance with options such as:

  • Access Control to authenticate and authorize downloads.
  • Content Targeting to get the correct download to the user on the basis of language, device type, and other identifiers.
  • File transfer optimization through advanced caching and cache key options, tiered distribution, and other technologies.
  • Bit Rate Limiting which provides the ability to throttle the speed in delivering files to the end user so there is less wasted bandwidth.

You should be familiar with these terms

If this is the first time you're configuring edge network services, you should read the following table to familiarize yourself with some terms used with the process.

Term Description
Content Provider (CP) Code This is an identifier for a particular subset of content on your Origin Server. Some features are applied individually to particular CP codes. CP codes are also used to provide additional granularity in reports and to track billing. You'll have at least one CP code per contract. Also, a CP code is associated with a single contract.
Property Hostname This is an identifier that indicates which Property file and product to use when processing incoming HTTP/HTTPS requests. Often, the Property Hostname is the full, end-user-facing hostname or fully qualified Domain Name of your application or site. For instance, www.mymedia.com might be both your domain name and your Property Hostname. The term "property" is more general and can include several Property hostnames (such as www1.example.com, www2.example.com, www3.example.com, etc.). Therefore, if you have multiple hostnames associated with a single domain, those Property hostnames are managed in a single Property file.
DNS Record This is a record that associates a Domain Name to an IP address.
Edge Hostname This describes your customer-specific subdomain on an Edge network domain. It maps incoming requests to our Edge servers. Typically, you specify Edge hostnames in your Canonical Name (CNAME) records. You associate your Property hostname with an Edge Hostname in Property Manager when creating the Property Configuration file for Download Delivery. For example, your site (Property hostname), www.mymedia.com might point to the Edge hostname, www.mymedia.com.akamaized.net. When requests are made to your Property hostname, they are pointed to the associated Edge hostname which resolves to our Edge servers. A server then accesses your DD property to read its settings and determine how content is to be delivered.
Edge Server This is a server in the Akamai Edge network that ultimately receives your end-user requests (end user requests to your Property Hostname are redirected to an associated Edge Hostname which resolves to the Edge Server). The Edge Server reads from the Property Configuration tied to the Property Hostname/Edge Hostname association, in order to determine how your site/application is to be delivered (via Rules and Behaviors established within that configuration)
Forward HOST Header The name the Edge Server forwards (often to the Origin Server) in the HTTP Host request header, sometimes also referred to as the expected host. Often, this is the same name as the Property Hostname.
Origin Server The Server where you keep your content to be served to end users (where your site/application resides). Edge servers read from an applicable Property Configuration file to determine Origin Server parameters (that you provide when creating the configuration).
Origin-server Hostname The Hostname that maps to your Origin Server from which Edge Servers retrieve your content. The usual syntax of the Origin-server Hostname is the Property Hostname preceded by “origin” and a hyphen.
Property file This is your Akamai delivery configuration that includes all of the common rules for processing end-user requests. You can use the Property Manager API or UI application (via Control Center) to configure properties used for DD.
Note: Most often, this is simply referred to as your "DD property," but the terms "property configuration file," "property configuration," "configuration," and "configuration file" are used interchangeably to describe this component.