Problems with UTF characters

[djotto]

I think serve-handler isn't implementing RFC 5987 correctly.

When I attempt to serve a file with the name DALL·E 2024-01-17.png (note the bullet point) I get the following error:

$ node server.js
Server running at http://localhost:3000/
node:internal/errors:496
    ErrorCaptureStackTrace(err);
    ^

TypeError [ERR_INVALID_CHAR]: Invalid character in header content ["Content-Disposition"]
    at storeHeader (node:_http_outgoing:580:5)
    at processHeader (node:_http_outgoing:575:3)
    at ServerResponse._storeHeader (node:_http_outgoing:451:11)
    at ServerResponse.writeHead (node:_http_server:422:8)
    at module.exports (/Users/djotto/projects/test-serve-handler/node_modules/serve-handler/src/index.js:754:11) {
  code: 'ERR_INVALID_CHAR'
}

Node.js v20.5.1

I put together a minimal demo

• node Version: 20.5.1 (also tested on 20.11.0 FROM node:20-slim)
• npm version: 10.2.5
• OS: MacOs 12.7.2
• Browser: Firefox 121.0.1