fetch() sends lower case header keys

Question

I'm writing an HTTP API library for use in Atom Electron. It is based on fetch. The server is outside of my control, but is written in PHP and I can see it checks headers in a case-sensitive fashion.

My code is something like:

const headers = new Headers(); headers.append('Authorization', `Bearer ${key}`);  const init = {     method: 'GET',     headers: headers  }   const req = new Request(baseUrl + '/items?format=json'); return fetch(req, init); 

The request is rejected with a 403 FORBIDDEN error. When I look at the request in the Electron Newtork panel, the request headers are present but Authorization has become authorization.

I know fetch() is just following the HTTP Standard, but is there a simple way to get fetch() to send the headers as I supply them?

Answer 1

Currently fetch will toLowercase() all headers. (there is some discussion here https://github.com/whatwg/fetch/issues/304 about optional disabling).

For now you may need to use http://api.jquery.com/jquery.ajax/ with the header option.