Hi there,
May I add that, in the CORS implementation, there is a specific header used for the caching duration: Access-Control-Max-Age This header is supported by most of browsers and its specification is available : https://fetch.spec.whatwg.org/#http-access-control-max-age One would think of using this header value instead of the well known Cache-Control header when dealing with CORS and OPTIONS requests. Cheers, Vincent ________________________________ De : Baptiste <[email protected]> Envoyé : mercredi 7 août 2019 12:38 À : HAProxy; William Lallemand Objet : [cache] allow caching of OPTIONS request Hi there, Please find in attachement a couple of patches to allow caching responses to OPTIONS requests, used in CORS pattern. In modern API where CORS is applied, there may be a bunch of OPTIONS requests coming in to the API servers, so caching these responses will improve API response time and lower the load on the servers. Given that HAProxy does not yet support the Vary header, this means this feature is useful in a single case, when the server send the following header "set access-control-allow-origin: *". William, can you check if my patches look correct, or if this is totally wrong and then I'll open an issue on github for tracking this one. Baptiste
