321e770c9b
Motivation: An intermediary like a load balancer might require that a Cross Origin Resource Sharing (CORS) preflight request have certain headers set. As a concrete example the Elastic Load Balancer (ELB) requires the 'Date' and 'Content-Length' header to be set or it will fail with a 502 error code. This works is an enhancement of https://github.com/netty/netty/pull/2290 Modifications: CorsConfig has been extended to make additional HTTP response headers configurable for preflight responses. Since some headers, like the 'Date' header need to be generated each time, m0wfo suggested using a Callable. Result: By default, the 'Date' and 'Content-Lenght' headers will be sent in a preflight response. This can be overriden and users can specify any headers that might be required by different intermediaries. |
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