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Probe of the postman and I realized the error: It was simply that the username field of the django table was mandatory:
const bodyFormData = new FormData();
bodyFormData.append('user.picture_url', this.params.user.picture_url.name);
bodyFormData.append('document', this.params.document);
bodyFormData.append('user.username', this.params.username);
and it worked wonders : D
Source:stackexchange.com