Streaming fails with "range not supported" error despite server supporting byte range requests

[sysint64]

Describe the bug

When attempting to stream a publication from the Readium publication server, the operation fails with a "range not supported" error, even though the server should support byte range requests. It work on kotlin-toolkit.

☝️ DefaultHTTPClient.swift:388: head https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json, headers: ["User-Agent": "BookWalker/0.0.0 iPhone17,3 iOS/18.5 CFNetwork/1.0 Darwin/24.5.0"]
☝️ DefaultHTTPClient.swift:388: get https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json, headers: ["User-Agent": "BookWalker/0.0.0 iPhone17,3 iOS/18.5 CFNetwork/1.0 Darwin/24.5.0"]
☝️ DefaultHTTPClient.swift:388: get https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json, headers: ["User-Agent": "BookWalker/0.0.0 iPhone17,3 iOS/18.5 CFNetwork/1.0 Darwin/24.5.0", "Range": "bytes=0-3"]
❌ DefaultHTTPClient.swift:441: Streaming ranges requires the remote HTTP server to support byte range requests: https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json
❌ DefaultHTTPClient.swift:408: get https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json failed with: - ReadiumShared.HTTPError.rangeNotSupported

Code:

let asset = try await readium.assetRetriever.retrieve(url: url).get()
let publication = try await readium.publicationOpener.open(
    asset: asset,
    allowUserInteraction: true,
    credentials: credentials,
    sender: nil
).get()

How to reproduce?

1. Go to Readium Test App
2. Import streaming publication: https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json

Readium version

3.3.0

OS version

iOS 18.5

Testing device

iPhone 16

Environment

macOS: 15.5
platform: arm64
carthage: 0.40.0
Xcode 16.3
Build version 16E140

Additional context

No response

[chocolatkey]

Additional info: I updated the publication server to ensure it's sending the accept-ranges requests. Examples:

curl -X HEAD -I https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json

HTTP/2 200
accept-ranges: bytes
vary: Accept-Encoding
[...]

curl -X GET -I https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json
HTTP/2 200
accept-ranges: bytes
vary: Accept-Encoding
[...]

curl --compressed -X GET -I https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json
HTTP/2 200
# NO accept-ranges because this is compressed content and the server can't serve ranges of compressed content! That's why vary: accept-encoding is sent
vary: Accept-Encoding
[...]

Here's an example of what the server sees: