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WebApiConfiguration
  Register
    //EnableCorsAttribute cors = new EnableCorsAttribute("http:site1.com,http://example.com","headers","GET,POST") 
    // "*" for everything
    EnableCorsAttribute cors = new EnableCorsAttribute("*","*","*") 
    config.EnableCors(cors)


Can also use 
[EnableCors("*","*","*")]
[EnableCors(origins: "*", headers: "*", methods: "*", exposedHeaders: "Lmao, X-Lmao, Server, Content-Length, X-Custom-Header")]
[DisableCors]
individually on controllers and actions