v0.27.1 FormData is sent as 'application/x-www-form-urlencoded' instead of 'multipart/form-data'

[TarikAmine]

Describe the bug

form-data is not correctly sent

To Reproduce

Code snippet to reproduce, ideally that will work by pasting into something like https://npm.runkit.com/axios, a hosted solution, or a repository that illustrates the issue. If your problem is not reproducible, please file under Support or Usage Question

let data = new FormData();
data.append('email', 'foo@bar.com');
axios.post("/test", data)
    .then(function () {
        console.log('OK');
    })
    .catch(function (response) {
        console.log('Error');
    });

Expected behavior

i'm using php so having data available for $_POST

Environment

• Axios Version 0.27.1 (//unpkg.com/axios@0.27.1/dist/axios.min.js)
• Adapter HTTP/1.1
• Browser Firefox
• Browser Version 99.0 (64 bits)
• OS: Ubuntu 20.04.4 LTS

Additional context/Screenshots

using 0.27.0 it works

POST /testing HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: application/json, text/plain, */*
Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------304178265014459940912396198163
Content-Length: 201
Origin: http://example.com
Connection: keep-alive
Referer: http://example.com/test
Pragma: no-cache
Cache-Control: no-cache

-----------------------------304178265014459940912396198163
Content-Disposition: form-data; name="email"

foobar@gmail.com
-----------------------------304178265014459940912396198163--

while 0.27.1 generate this request

POST /testing HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: application/json, text/plain, */*
Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 201
Origin: http://example.com
Connection: keep-alive
Referer: http://example.com/test
Pragma: no-cache
Cache-Control: no-cache

-----------------------------349593416634898083182714306103
Content-Disposition: form-data; name="email"

foobar@gmail.com
-----------------------------349593416634898083182714306103--

[pandaCure]

me to，axios@0.27.0 does't send formdata

[TarikAmine]

axios@0.27.0 works, its 0.27.1 that fails

Edit: i'm using axios with cdn where this url https://unpkg.com/axios@0.27.0/dist/axios.min.js has this comment head

/* axios v0.27.0 | (c) 2022 by Matt Zabriskie */
/* axios v0.26.1 | (c) 2022 by Matt Zabriskie */

so i'm a bit confused

[romain-banchetti]

Same problem here, we downgraded to 0.27.0.

[jasonsaayman]

I dont know why that is the case in unpackage but please use https://unpkg.com/axios@0.27.1/dist/axios.min.js

[TarikAmine]

https://unpkg.com/axios@0.27.1/dist/axios.min.js is broken

the problem with unpackage is that they label 0.26.1 as 0.27.0, but the bug stands and 0.27.1 is broken with bad content type and missing boundry

[jasonsaayman]

Linking #4631