expose callback for sending an interim response - #29
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@miyagawa Do the choice of the name and the signature of the subref look sensible? Or does an extension for sending an interim response already exist? |
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A subref is exported as
psgix.informationalfor sending an interim response, defined in RFC 7231 section 6.2.The subref takes two arguments. The first argument is the 1xx status code to be sent to the client. The second argument is an reference to an array of headers that should be sent. In other words, it is the same as the PSGI response but without a body.
The intended use-case of the extension is to to trigger HTTP/2 servers running downstream start pushing the specified resources (e.g. CSS, JavaScript) while the PSGI application generates a response. By using the extension, PSGI applications can send a set of
link: rel=preloadheaders associated to an 1xx response (which is recognized by the HTTP/2 servers as a signal to start pushing the assets), and then process the request.see also: h2o/h2o#672 (comment)