Extend format option to support redirection of trailing slash for directories
#136
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Extended
formatoption from( *true | false )to( *'follow' | 'redirect' | false ).'follow'behaves the same as the oldtrue, and keep as default.'redirect'is used for the redirection new feature.If trailing slash for directories is absent and index is defined, when
formatis set to'redirect', it redirects the page using HTTP 302 to the URL with trailing slash added, at the same time respecting previous scheme and query.Return value of
await send()istruewhen such a redirection happened, in contrast ofundefinedwhen encountering errors andpathnamewhen the file is served.