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Image renderer and cacher in Erlang
For some use-cases [1] it is unnecessary or not desirable to do source image caching. The configuration should contain a setting to control this.
[1] Most notably when images are served "as is" (without width/height/annotation options), caching the source and rendition (which will be exactly the same as the source) leads to duplication in the cache.
The canonical URL of the request can be provided when:
[1] wurfl is NOT used as width/height specifier,
[2] wurfl IS used as width/height specifier AND the useragent is provided as part of the query.
Ref:
14.14 Content-Location
The Content-Location entity-header field MAY be used to supply the resource location for the entity enclosed in the message when that entity is accessible from a location separate from the requested resource's URI. A server SHOULD provide a Content-Location for the variant corresponding to the response entity; especially in the case where a resource has multiple entities associated with it, and those entities actually have separate locations by which they might be individually accessed, the server SHOULD provide a Content-Location for the particular variant which is returned.
Content-Location = "Content-Location" ":"
( absoluteURI | relativeURI )
The value of Content-Location also defines the base URI for the entity.
The Content-Location value is not a replacement for the original requested URI; it is only a statement of the location of the resource corresponding to this particular entity at the time of the request. Future requests MAY specify the Content-Location URI as the request- URI if the desire is to identify the source of that particular entity.
A cache cannot assume that an entity with a Content-Location different from the URI used to retrieve it can be used to respond to later requests on that Content-Location URI. However, the Content- Location can be used to differentiate between multiple entities retrieved from a single requested resource, as described in section 13.6.
If the Content-Location is a relative URI, the relative URI is interpreted relative to the Request-URI.
The meaning of the Content-Location header in PUT or POST requests is undefined; servers are free to ignore it in those cases.
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