Change an axios instance's default headers?

I use token in the headers for authentication. So I firstly create an axios instance to login. All the requests after login should carry the token in a header field.

Q1: Should I use instance.interceptors.request.use() to inject the token?

In my integration test, I login as different users. The instance.interceptors.request.use() accumulates the token configs in an internal array, and the login result is not always right. So I must instance.interceptors.request.eject() before each instance.interceptors.request.use() just to clear the internal array.

Q2: Is there a better way to change an instance’s default headers?

[mzabriskie]

If you always know the value of the header:

axios.defaults.headers.common['Auth-Token'] = 'foo bar';

This will automatically add the header to every request.

[smilingpoplar]

Yes, I should update the version. https://github.com/mzabriskie/axios/blob/v0.8.1/lib/axios.js#L12

And for axios v0.9.0, set for instance:

Object.assign(instance.defaults, {headers: {authorization: 'foo bar'}});