Response has unsupport header throw exception: Failed to parse header value.message

[Nondirectional]

Question:

For this request, I can get the response header and status code information when using JavaScript.

However, when using http to send the request and parse the response, an exception is thrown, and I cannot get any information including the status code and response header except an error message.

Reproducible example:

void main() async {
  final client = HttpClient();
  final request = await client.postUrl(
    Uri.parse('http://memos.w-wbr.space/api/v1/auth/status'),
  );
  final response = await request.close();
  print(response);
}

[dart-github-bot]

Summary: Dart's HttpClient throws an exception when parsing a malformed response header from http://memos.w-wbr.space/api/v1/auth/status. JavaScript handles the same request successfully.

[mraleph]

The exception is thrown because user not found is not a valid value for WWW-Authenticate header, see RFC 7235 Appendix C for the correct format.

I am not sure if we should be more lax when parsing the header though.

cc @brianquinlan

[lrhn]

It's a question of what to do.
If it doesn't throw, then either

• The resulting header has an invalid value, or
• The resulting header has no entry even if the header sent by the server had something.

I guess the latter is better, but it still feels like dropping an error on the floor.