Can't post FormData since Axios 0.25.0

Describe the issue

I can’t post FormData since "axios": "^0.25.0",

Error: Request failed with status code 400

Example Code

export const client = axios.create({
        baseURL: URL_API,
        withCredentials: true,
        responseType: 'json',
	timeout: 30000,
});

const params = new FormData();

params.append('name', data.model);
params.append('idFuel', data.idFuel);
params.append('power', data.idPower);

client.post(`/app/society/${idSociety}/vehicle`, params, { headers: { "Content-Type": "multipart/form-data" } })

Expected behavior, if applicable

That it works

Environment

• Axios Version: 0.25.0
• Node.js Version: v14.17.6
• OS: iOS 15, Android 11 (But on all platforms and versions)
• Additional Library Versions: React Native 0.64.3

Additional context/Screenshots

No problem with "axios": "^0.24.0",

I saw this PR https://github.com/axios/axios/pull/3757 on 0.25.0, but I don’t know what I have to change in code.

Thanks for your help 👍

[kenikori]

It works for me:

const formData = new FormData();
...
const response = await networking.post('/URL', formData, {
  headers: {
    'Content-Type': 'multipart/form-data',
  },
  transformRequest: (data, headers) => {
    return formData;
  },
});

Versions: react-native: 0.67.2 axios: 0.26.0

[schteff]

This is a shorter form, since it is still needed in 0.26.1

axios.post(url, formData, {
  headers: { 'Content-Type': 'multipart/form-data' },
  transformRequest: formData => formData,
})

The headers value might only be needed if you have modified the default Content-Type for axios. (just a guess since I have read that axios should set the correct Content-Type based on the FormData type)

In which axios version will the fix that closed this issue be released?