Serving static (non-image) content

Image Serving provides a mechanism to manage non-image contents in catalogs and serve it via a separate context /is/content. The mechanism allows for configuring the TTL for each item separately.

Basic syntax

request

http:// server /is/content[/ catalog / item ][? modifiers ]

server

server_address [: port ]

catalog

Catalog identifier.

item

Static content item ID.

modifiers

command *[& command ]

command

cmdName = value

cmdName

One of the supported command names.

value

Command value.

Command overview

Image Serving supports the following commands at /is/content:

type

Content type filter.

req

req=userdata , req=props , and req=exists only.

cache

Allows disabling client-side caching.

Static content catalogs

Static content catalogs are similar to image catalogs, but support fewer data fields:

Attribute/Data Notes

catalog::Id

The catalog record identifier for this static content item

catalog::Path

The file path for this content item

catalog::Expiration

The TTL for this content item; attribute::Expiration is used if not specified or if empty

catalog::TimeStamp

File modification time stamp; required when catalog-based validation is enabled with attribute::CacheValidationPolicy

catalog::UserData

Optional metadata associated with this static content item; available to the client with req=userdata

catalog::UserType

Optional data type; can be used to filter requests for static content with the type= command

Filtering static content

This mechanism can help ensure that clients receive only contents appropriate for their needs. Assuming that the static content is tagged with appropriate catalog::UserTypevalues, the client can add the type= command to the request. Image Serving will compare the value provided with the type= command to the value of catalog::UserType and, in case of a mismatch, return an error instead of potentially inappropriate contents.

See also

type= , req=, Image Catalog Reference

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