Setting 'Content-Type' header does not work.

[star-collector]

It seems like setting Content-Type header is impossible without data property:

const api = Axios.create({
  baseURL: 'https://my-url',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
  },
});

api.post('/post-something'); // The request doesn't contain 'Content-Type' header.
api.get('/get-something', {
  headers: { 'Content-Type': 'application/json' }
}); // Still no 'Content-Type' header.

api.post('/post-something', null); // Works. 'Content-Type' is present in the request.
api.get('/get-something', {
  data: {},
  headers: { 'Content-Type': 'application/json' }
}); // Works as well.

[Alanscut]

indeed, in browser environment, the Content-Type will be removed if data is undefined. Because there is no need to set the Content-Type when no data to transfer.

axios/lib/adapters/xhr.js

Lines 119 to 129 in 8414664

	if ('setRequestHeader' in request) {
	utils.forEach(requestHeaders, function setRequestHeader(val, key) {
	if (typeof requestData === 'undefined' && key.toLowerCase() === 'content-type') {
	// Remove Content-Type if data is undefined
	delete requestHeaders[key];
	} else {
	// Otherwise add header to the request
	request.setRequestHeader(key, val);
	}
	});
	}

[star-collector]

Because there is no need to set the Content-Type when no data to transfer.

Some backend systems still require it to be passed specifically, even if there are no data to transfer. Backend I have to work with returns an error when there is no Content-Type present.

Also, it seems like the same bug was already fixed once. #86

[Alanscut]

That fix(3c4dfe8) actually was about case of content-type #86 (comment) , mzabriskie mistakenly thought that #86 is the same kind of problem, so this issue still exists.
As you said, setting Content-Type header is impossible without data property currently.

@yasuf , should axios surpport this feature?