This pojo loads properties from the application.yml file under the application namespace. In order to support easy configuration and also to allow for easier testing, configuration values are provided via the CorsConfigurationProperties object provided to the constructor via injection. We'll discuss that in a minute, but let's take a peek at the code. However, the values for allowed origins are picked up from our application.yml file. For the purpose of our demo, we'll allow GET and POST requests from all origins against all endpoints on the server.
Next, we'll want to override the addCorsMappings(.) method and use the CorsRegistry object provided as a parameter to create our mappings and configure the appropriate CORS values.įurther details of how to build out your mappings can be found in the CorsRegistry API documentation here. We need to update the WebFluxConfig class to implement the WebFluxConfigurer interface. Remember that empty WebFluxConfig class? That's the spot. Switching out to functional endpoints renders the typical annotation useless.įortunately, it turns out that the easiest way to do this for functional endpoints allows all of our configuration to take place in one spot. My whole reason for writing this was that it turned out to be pretty hard to actually find examples of how to configure CORS for functional endpoints on Spring WebFlux applications. Instead, we're making a fairly thin implementation, but it would be easy enough to expand it out into something more comprehensive.Įnough idle chatter, let's get down to it. We're going to deeply explore the functionality of CORS.
This mechanism also allows servers to restrict origins from which requests are accepted. In simplest terms, it's a header-based mechanism which allows a server to specify origins other than its own from which the browser can expect to load resources. What exactly is CORS you may possibly be asking? CORS stands for Cross-Origin Resource Sharing. Just like the last two posts, we'll be using the project in this repo on GitHub. CORS is one of those things you don't have to set up or configure very often, so it's easy to forget - or just flat out not know - how to implement it. This instalment is going to be pretty quick, but it's also important enough to deserve its own post.
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