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PSGI::Extensions: add a modified PSGI environment cleanup handlers pr…
…oposal This is an import of the proposal at https://github.com/Plack/psgi-specs/wiki/Proposal%3A-PSGI-environment-cleanup-handlers with the following changes: * Fixed various typos & grammar error * We now say that psgix.cleanup.handlers MUST be ArrayRef I don't see any reason for why a server would support cleanup mode but wouldn't be capable of initializing psgix.cleanup.handlers to . Just make this a MUST since having the server initialize it is easier, and if it can't create an empty ArrayRef in $env at the start of the request it probably can't support Plack (or Perl) at all. * Add background on what the cleanup handlers are for I think it helps to add a bit of background here to be explicit about what this feature is for, and in particular make sure that servers aren't going to implement this in some blocking fashion while the client is still waiting on them. In addition the pull request originally contained two new boolean flags, see "PSGI::Extensions: add two new boolean flags to the cleanup spec", but after discussing it with miyagawa we decided to drop that part.
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