![]() If JavaScript sets cookie domain as then cookie can actually be read by the RIaS on any sub-domain *. When setting cookie, cookie domain should be scoped properly. This enables images to be cached in client-browser but not on proxy or CDN. To disable the caching by proxy or CDN, RIaS is required to set Cache-Control header private. Hence CDN or proxy caching may not work with cookie based RIaS. This can happen because on first page view preloader may have already started downloading images before cookie was set.Īlthough for a given image cookies can be different for different user agents, image URLs will be same (not unique). ![]() In case of cookie based solution, first page view can be visually different from subsequent page views. Overall workflow is described in this image. If cookie domain is scoped correctly, RIaS can read the cookie and scale images according to cookie properties. Environment hints (EH) like viewport, device-pixel-ratio, breakpoints, orientation are stored in cookie as properties. On first page load a client-side JavaScript will set a cookie. Other solutions follow a mixed approach - REST API with cookies. Rather than REST API, some RIaS solutions relies solely on cookies or device detection for scaling images. This is equivalent Image API call using only Path parameters. This is example Image API using Path parameter and Query parameter. Depending on RIaS solution, optional parameters describing re-size, crop, format, device-pixel-ratio, breakpoints etc can be passed either as Query or Path parameters. As a rule of thumb, most of RIaS APIs require source file path as Path parameter. Normally, a RIaS API can use Path parameters, Query parameters, or both to enable dynamic image manipulation. Standalone RIaS runs on a different domain or sub-domain. Embedded service is normally part of core application and runs on same domain. RIaS can be deployed as standalone service as well as embedded service. To generate responsive images it uses master images typically stored in an image repository. RIaS is a key component of any responsive image solution. A Responsive Image as Service (RIaS) offers on-the-fly responsive image generation and delivery using REST APIs or REST like image paths.
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