missing accept head return 404 error

[aheissenberger]

Describe the bug

When a client issues a request without accept header, the react server will return a 404 error.

Based on HTTP specification RFC 9110 §12.5.1:
If no Accept header is present:
The server may assume that the client accepts any media type (/).

So, the effective behavior is as if the client sent:
Accept: */*

That means:
• The server can return its default representation (often text/html, application/json, or whatever makes sense for the endpoint).
• It should not return 406 Not Acceptable unless it truly has no representation to serve.

Reproduction

No response

Steps to reproduce

1. cd examples/hello-world
2. pnpm build && pnpm start

broken return:

curl -v -H "User-Agent:" -H "Accept:" http://localhost:3000
* Host localhost:3000 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:3000...
* Connected to localhost (::1) port 3000
> GET / HTTP/1.1
> Host: localhost:3000
> 
* Request completely sent off
< HTTP/1.1 404 Not Found
< Date: Sun, 02 Nov 2025 21:15:35 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
< Content-Length: 0
< 
* Connection #0 to host localhost left intact

Note: problem exists for Accept: */* too

expected output:

curl -v -H "User-Agent:" -H "Accept: text/html" http://localhost:3000
* Host localhost:3000 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:3000...
* Connected to localhost (::1) port 3000
> GET / HTTP/1.1
> Host: localhost:3000
> Accept: text/html
> 
* Request completely sent off
< HTTP/1.1 200 OK
< cache-control: must-revalidate
< content-type: text/html; charset=utf-8
< last-modified: Sun, 02 Nov 2025 21:19:31 GMT
< Date: Sun, 02 Nov 2025 21:19:51 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
< Transfer-Encoding: chunked
< 
* Connection #0 to host localhost left intact
<link rel="preconnect" href="/" id="live-io"/><h1>Hello World</h1

System Info

System:
    OS: macOS 15.7.1
    CPU: (12) arm64 Apple M4 Pro
    Memory: 258.80 MB / 48.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 25.1.0 - /opt/homebrew/bin/node
    npm: 11.6.2 - /opt/homebrew/bin/npm
    pnpm: 9.15.5 - /opt/homebrew/bin/pnpm
  Browsers:
    Chrome: 141.0.7390.123
  npmPackages:
    @lazarv/react-server: workspace:^ => 0.0.0

Used Package Manager

pnpm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[lazarv]

This is now fixed with #279 and also released as version 0.0.0-experimental-600622d-20251109-6c5a6bee.

[github-actions]

This issue has been locked since it has been closed for more than 30 days.

If you have found a concrete bug or regression related to it, please open a new bug report with a reproduction against the latest version of @lazarv/react-server. If you have any other comments you should create a new discussion.