Response

Indicates that the requested content was delivered to an authorized user.

HTTP Large/HTTP Small Only: By default, the response will be cached unless the asset’s headers specifically prohibit caching.

ADN: By default, the response will not be cached.

Indicates one of the following took place:

• URL redirection
• Cookie revalidation

Indicates all of the following:

• A request for stale content was revalidated.
• The time-to-live (TTL) of the requested content has been updated.
• The requested content was delivered to an authorized user.

This status code is returned to a user in response to an unauthorized request. The requester will be denied access to the requested asset.

A request for an asset protected by Token-Based Authentication is considered unauthorized when:

• It does not include a valid token.
• The requester does not meet the conditions specified in the included token.

An origin server returns this status code when the requested asset was not found.

Indicates whether a server can accept range requests.

Default value: bytes

The default value indicates that our servers can accept byte-range requests.

Indicates the maximum length of time that a request is considered fresh. An edge server can serve fresh content directly from cache without having to perform a revalidation with the origin server.

Default value: 604800

The default value indicates that the max-age for the requested content is 7 daysMax-age is defined in seconds. 604800 seconds = 7 days.

Indicates the media typeIdentifies/classifies the data contained in a file. (aka content type) for the response body. Sample media types are provided below.

• text/plain

• text/html

• text/css

• application/x-javascript

• text/javascript

Indicates the date and time (GMT) on which the edge server returned a response.

Indicates the entity tag (ETag) for the requested content. This ETag allows our edge servers to revalidate stale content. In other words, our edge servers will use ETag when checking with the origin server to see if there is a newer version of the requested content.

Indicates the date and time (GMT) at which the response will be considered stale. By default, our edge servers must revalidate requests for stale content.

Indicates the date and time (GMT) at which the requested content was last updated.

Provides information about the server that fulfilled the request.

Syntax (Customer Origin Server)

If a cached version of the requested content is not found, then the customer origin server will provide a response.

• Server Response Header: If a Server response header is provided by the customer origin server, then our edge servers will forward it to the requester.
• Missing Server Response Header: If the Server response header is missing, then information about the edge server that fulfilled the request will be returned to the requester. Please see the syntax for cached content.

Syntax (New Content & CDN Storage)

The following syntax applies for requests to CDN storage that have not been previously cached:

The terms used in the above syntax are defined below:

• POP: Indicates the POP that handled the request.

  View a list of POPs.

• ID: Indicates a four digit alphanumeric system ID. This field is used solely for internal purposes.

Syntax (Cached Content)

The following syntax applies for requests for cached content:

The terms used in the above syntax are defined below:

• Platform: Indicates the platform on which the content was requested. The following codes are valid for this field:

  Code	Platform
  ECAcc	HTTP Large
  ECS	HTTP Small
  ECD	Application Delivery Network (ADN)

• POP: Indicates the POP that handled the request.

  View a list of POPs.

• ID: This field is for internal use only.

This response header is only returned when a staleIdentifies cached content whose TTL has expired. Our edge servers revalidate stale content with the origin server. This step ensures that the latest version of the requested content is served to the requester. response is served to the client. A stale response is typically served under the following conditions:

• The Stale While Revalidate feature was applied to the request.

  Response header value:

  110 - "Response is stale"

• RevalidationCache revalidation is the process through which an edge server checks the origin server for a newer version of a cached asset. Revalidation is triggered when the TTL for the requested content has expired. failed and either of the following conditions is true:

  • The origin server returned a 5xx response and the Stale Content Delivery on Error feature was applied to the request.
  • The origin server is unresponsive and the stale window, as defined by the Internal Max-Stale feature, is active.

  Response header value:

  111 - "Revalidation Failed", 110 - "Response is stale"

Identifies the variant that defines whether cached content can be served for future requests.

Key information:

• Our network only supports a single variant called "Accept-Encoding." This value indicates that the Accept-Encoding request header determines whether cached content will be served.
• By default, our edge servers only return this header when the requested content was previously cached.

The Accept-Encoding request header identifies the type of compression requested by the client. An edge server may deliver the requested content immediately if the cached asset matches the requested compression method.

Indicates that a cached version of the requested content was served directly to the requester by an edge server.

This response header will be set to the following value:

• HIT: Indicates that a cached version of the requested content was found and served to the user.

Indicates that a compressed version of the requested content was served to the requester.

This response header will indicate the asset's compression type (e.g., gzip, deflate, bzip2, etc.).