Content Characteristics and OD

This behavior lets you define specific information about your content to optimize its delivery.



Origin Object Size

Use this to set a range for the size of the objects delivered through this property:

  • Less than 1MB
  • 1-10MB
  • 10-100MB. Partial Object Caching is automatically enabled with this setting.
  • Unknown. Set to this value if you're unsure of the specific object size, or you don't have a definitive fixed size for target content. Partial Object Caching is automatically enabled with this setting for objects greater than 10 MB in size.
Note: If you have files larger than 100MB, you should be using Akamai' s Download Delivery or Adaptive Media Delivery products. Talk to your account representative for more information.

Do you need Partial Object Caching (POC)?

POC is part of our Large File Optimization support. It increases origin server offload by caching in chunks, instead of as a single, composite object. POC is required for the delivery of "large files"—those in excess of 10 MB in size. It's automatically enabled if you select any of these as your Origin Object Size:
  • 10-100 MB.
  • Unknown. POC is applied for an object that is greater than 10 MB in size, if the object falls into what you've selected for Content Type. For example, if you've selected "Software" as your Content Type, POC is enabled if a file of that type is requested that's over 10MB in size.
If you set Origin Object Size to Less than 1MB or 1-10MB, POC is not enabled. If a request is made through this configuration for a larger file, a 403 error is returned.

If you specify a "large files" setting, but your origin never actually serves files in that size range, the Akamai platform makes additional requests to the origin. This can impact overall performance and access. This happens because the edge server requests the first byte of each object to determine if the minimum object size criteria has been met—at least 10MB. Once that check fails, the server simply re-requests the entire object from the origin.

We recommend that you verify the size of your delivery objects on your origin, and select the appropriate size to ensure that POC is enabled or disabled, as necessary.

Popularity Distribution

Select how often the content is requested:

  • Long Tail: This applies if most of the traffic volume consists of a small number of requests for content that has relatively long life.
  • Popular: This applies if most of the traffic volume consists of a large number of requests for content that has a relatively short life.
  • Other: Select this if your use case isn't available for selection, or it is a combination of the available selections.
  • Unknown (Default): Select this if you're not sure of the popularity level for the content to be delivered by this property.

Catalog Size

Use this to set the overall volume of objects to be delivered through this property.

  • Small: Select if all of your content is less than 100G.
  • Medium: Select this if all of your content 100G to 1TB.
  • Large: Select this is all of your content ranges from 1TB to 100TB.
  • Extra Large: Select this if all of your content is greater than 100TB.
  • Unknown (Default): Select this if you don't know the volume.

Content Type

If you're delivering a specific type of content with this property configuration, you can select it here to help optimize delivery.

  • User Generated: This typically describes user-generated media.
  • Web Objects: This typically describes media delivered for websites.
  • Software: This includes full non-game applications ("apps") or installables.
  • Images: This includes any image-based file type, including, but not limited to JPEG files, PNG files and GIF file.
  • Other Objects: Select this if your use case isn't available for selection, or it is a combination of the available selections.
  • Unknown (Default): Leave it set to this if you're unsure of the specific content type.

Best Practices settings applied by default

We automatically apply various "Best Practices" settings to coincide with the Content Characteristics behavior in your property configuration. (You don't need to manually define these via individual behaviors, because we preset them for optimal performance.)

Feature Setting applied
Optimized For
  • Small Objects: Objects less than 10 MB.
  • Maximum Object Size: 100 MB
Basic HTTP Settings
  • HTTP version 1.1
  • Transfer / Chunked encoding between Edge and client
Cross Origin Resource Sharing (CORS) No CORS headers are sent to the client.
GZIP Content Compression
  • Automatically enabled for origin to edge: This only applies if the Accept-Encoding header is sent in the request to the origin.
  • Automatically enabled for edge to client: This only applies the if Accept-Encoding header is received from client.
Caching
  • The Remove VARY header is sent from origin: This enables content caching.
  • Positive caching policy for response codes: 200, 203, 300, 301, 302 and 410
  • Positive Caching Time to Live (TTL): One (1) day
  • Negative caching for response codes: 204, 305, 404, and 405
  • Negative caching TTL:
    • NetStorage as your origin: 30 seconds
    • All other origins: One (1) second

Content Characteristics and Mixed Mode Configuration

This is a "use case-based" behavior that's automatically included in the Default Rule and used to optimize delivery for all requests. However, with Mixed Mode Configuration for Object Delivery, you can also include it in another rule and apply different match criteria to have separate requests use different content characteristics optimizations.

For more details, see Use Mixed Mode with OD.