httputil: add serve methods for caching #93
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Summary
Add
ServeXXXmethods tohttputilto implement caching via theServeContentfunction in thehttppackage. This supports ETags computed by taking thefnvhash of a slice of bytes.This does mean we will buffer all results in memory, but it can save dumping the whole response by returning a 304 when nothing changes.
Related issues
Fixes #92
Checklist
improvement/bug/ etc)