Axios doesn't see the User-agent header

[Viiprogrammer]

Describe the bug

Axios doesn't see the User-agent header

To Reproduce

const axios = require('axios');

axios.get('https://postman-echo.com/get', {
	headers: {
		'User-agent': 'USER'
	},
})
.then(function (response) {
	console.log(response.data.headers['user-agent']); //Returns - axios/0.21.1
})

const axios = require('axios');

axios.get('https://postman-echo.com/get', {
	headers: {
		'User-Agent': 'USER'
	},
})
.then(function (response) {
	console.log(response.data.headers['user-agent']); //Returns - USER
})

const axios = require('axios');

axios.get('https://postman-echo.com/get', {
	headers: {
		'user-agent': 'USER'
	},
})
.then(function (response) {
	console.log(response.data.headers['user-agent']); //Returns - USER
})

Expected behavior

axios.get('https://postman-echo.com/get', {
	headers: {
		'User-agent': 'USER'
	},
})
.then(function (response) {
	console.log(response.data.headers['user-agent']); //Returns - USER
})

Environment

• Axios Version [0.21.1]
• Adapter [none]
• Browser [none]
• Browser Version [none]
• Node.js Version [v15.12.0]
• OS: [Windows 7]
• Additional Library Versions [none]

Additional context/Screenshots

None

[lichader]

@Viiprogrammer
Based on this line, I think you can only use User-Agent or user-agent.

[Viiprogrammer]

@lichader

If you read https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers, then the title of the headers should not be case-sensitive.

The axios documentation does not specify that the headers are case sensitive.

[lichader]

Yes. I was just stating the current behaviour, which doesn't mean I think this behaviour is correct. HTTP headers should be case insensitive.

[ranjan-purbey]

Fixed by #2880

[jasonsaayman]

Closed see above