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Issue scope

Docker / Kubernetes

Describe the bug

If I run SWS with my "frontend" package, with both regular and pre-compressed files (.gzip), I see an unexpected content-encoding returned by SWS: content-encoding: gzip, gzip.

After verification, the content is packaged twice, aka a gzip inside a gzip.

This generates issues with Apple based browsers, because they don't process gzip twice and so can't parse js or css after the first "unpackaging".

How to reproduce it

Find attached files I have generated, with the unexpected result in SWS:

app-css.zip

If I run the SWS with docker run -it --rm -p 8080:8080 ui-for-testing, using the following configuration:

[general]

host = "::"
port = 8080
log-level = "info"

cache-control-headers = true
compression = true
compression-static = true
security-headers = true
directory-listing = false
redirect-trailing-slash = true
ignore-hidden-files = true

I get the following result when I run the following curl call:

curl 'http://localhost:8080/app.min.css' \
      -H 'Accept: */*' \
      -H 'Accept-Encoding: gzip' \
      -v -o nul &| grep content-encoding
< content-encoding: gzip, gzip

If I set compression-static = false, the result is "normal", but I suspect the compression is done by SWS and doesn't leverage the pre-built gzip file.

curl 'http://localhost:8080/app.min.css' \
      -H 'Accept: */*' \
      -H 'Accept-Encoding: gzip' \
      -v -o nul &| grep content-encoding
< content-encoding: gzip

Expected behavior

I expect the system to leverage the pre-build gzip and returns a content-type with only gzip once.

Complementary information

From the investigation I did, this bug has been introduced after 2.31.0.

If I change my Dockerfile to 2.32.0, I have the issue, but I don't have it with 2.31.0, of course with the same config and files.

Build target

Docker linux/amd64

Environment and specs

• static-web-server: [e.g. v2.32.0+]
• Rust: [e.g. v1.78.0]
• OS: Distrolesss
• Arch: x86_64 (64-bit), ARM (32-bit), ARM64 (64-bit)
• Docker: 27.1.1
• Client: All (Safari, Chrome, Arc, curl)

Additional context

This issue has been found while developing on my application, Podcast-Server, and you can find the code used by the UI here