Looks fine. There are a few stylistic, efficiency, and configurability things though. I'd inline the test of Accept-Encoding myself. (Update)It would probably be better to use read with something like a 4k chunk at a time instead of linewise (Update: when passing compressed content), especially considering it's a binary file and $/ may not even occur in the file for some platforms (think \r\n). Finally, I'd consider letting the user somehow define the extension(s), or perhaps MIME-types to support decompression for.

UPDATE: As for SSI you might mention that the user could instead construct a skeleton document with the existing SSI and then include a body handled by this module as an SSI.

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I'm not belgian but I play one on TV.

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