Cross-Origin Web Services with CORS and WCF

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Because of the same origin policy javascript from one domain can access resource wcf handle options request another domain only through GET request. Cross origin resource sharing is a mechanism to mitigate this limitation by setting wcf handle options request headers to allow interaction. Basically when javascript tries to communicate with different domain browser will expect server to return appropriate CORS headers or response will not be processed.

Also browsers that support CORS will insert "preflight" request before actual request to determine if script has permission to perform action. The problem with WCF service is that it doesn't know what to do with preflight request. First we need a place to store allowed domains with configurations. In this article I will use custom. NET configuration section to do so, but behavior will work with any store database, plaintext file, etc.

This is what final configuration looks like:. Next I will create an endpoint behavior and attach to it wcf handle options request inspector that will enable CORS support:. The idea behind this implementation is to hook up to every request made to the WCF service, and to inspect its headers. If the verb invoked wcf handle options request "OPTIONS" then we know that this is a preflight request and we completely change server response to comply to the expected response for preflight.

If request is not preflight then we read configuration and set appropriate headers if wcf handle options request have origin match. The complete source code with wcf handle options request and tests can be found at my github repository. In this article I briefly explained the problem that arises when someone tries to invoke WCF service from javascript served on a different domain.

In this article I included the gist of solution, for any details regarding to service bindings, endpoints and other configuration please check source code.

Configuration First we need a place to store allowed domains with configurations. This is what final configuration looks like: Name, httpResponse ; httpResponse. AllowHeaders ; if domain. Source code The complete source code with service and tests can be found at my github repository. Summary In this article I briefly explained the problem that arises when someone tries to invoke WCF service from javascript served on a different domain.

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For any theory of pairwise preference (that does not predict indifference among any of the stimuli under consideration), whether it involves highly specified numerical functional forms like. For example, the permissible preference states may be specified through a list of general axioms (rules defining the mathematical representation of preferences). We have discussed aggregation- and distance-based specifications of algebraic theories that encapsulate the notion that the decision maker has a fixed binary preference and makes occasional erroneous choices, with error rates being constrained in a variety of ways.

This type of model makes it possible to develop probabilistic specifications of theories that are numerical or nonnumerical, that allow a single preference pattern or multiple preference patterns.