Describe the issue

I set axios.defaults.headers.common['Content-Type'] = 'application/json'. When firing a axios.patch request (without a config), the request uses application/x-www-form-urlencoded instead.

Example Code

// This does not work as expected:
axios.defaults.headers.common['Content-Type'] = 'application/json'

// This does:
axios.defaults.headers.common['Content-Type'] = 'application/json'
axios.defaults.headers.patch['Content-Type'] = 'application/json'

Expected behavior

I expected POST requests to use axios.defaults.headers.common, too.

I think this is where the problem (or intended behaviour) comes from:

Axios Version

1.4.0

Adapter Version

No response

Browser

Firefox

Browser Version

116.0.3 (64-bit)

Node.js Version

No response

OS

No response

Additional Library Versions

No response

Additional context/Screenshots

No response