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in my opinion, axios is ajax library,
I suggest you should add default head value,(headers["X-Requested-With"] = "XMLHttpRequest") just like jq;

because backend developer need this flag to distinguish ajax request from request,

in order to do some different request handling; such as error handling;

if there is an ajax request error happening ,we will return json (including error message)
if there is a http request error happening,we may redirect to other page or others

in some team,some people use jq,some people use axios,.......

so I suggest ......

You can set default headers for Axios on your browser:

https://github.com/axios/axios#custom-instance-defaults

This will accomplish your goal without modifying Axios.

Note that adding the X-Requested-With header makes the request "unsafe" (as defined by CORS), and will trigger a preflight request, which may not be desirable.
See https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Simple_requests for more