setting content-length

[gsimko]

Prerequisites

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🚀 Feature Proposal

I propose to set content-length when it's available. I'm using the preCompressed option so the size is trivially available. I'm less certain whether it is doable for on-the-fly encoding. Wdyt?

Motivation

No response

Example

No response

[mcollina]

Thanks for reporting! Would you like to send a Pull Request to address this issue? Remember to add unit tests.

[gurgunday]

This feature would be a good addition, and it would be even better if we could do it for uncompressed files as well (by using statSync or something)

[gsimko]

Looks like this is not a fastify problem.
Fastify-static relies on fastify-send and that one already sets content-length by using stat. By locally running the query and checking the response I could confirm that it's set.

In my case it must be some other component that's causing the trouble. I noticed that the browser uses http2 requests while I configured fastify to use http1 so there must be a proxy somewhere in the setup doing the conversion. I guess that one drops the content-length header. @gurgunday could that explain why you also observed this problem?

[gurgunday]

That's interesting, I don't see the header in my production app either, let me try on localhost and come back on this

[gurgunday]

Oh yeah, it's compress that's removing it for me, which makes sense

It might indeed be a proxy like Cloudflare that's dropping it too

Closing the issue if you don't have any other problems, feel free to comment again otherwise