dist/vue-resource.esm.js
function form (request) {

    if (isFormData(request.body)) {
        request.headers.delete('Content-Type');
    } else if (isObject(request.body) && request.emulateJSON) {
        request.body = Url.params(request.body);
        request.headers.set('Content-Type', 'application/x-www-form-urlencoded');
    }

}
function form (request) {

    if (isFormData(request.body)) {
        request.headers.delete('Content-Type');
    } else if (isObject(request.body) && request.emulateJSON) {
        request.body = Url.params(request.body);
        request.headers.set('Content-Type', 'application/x-www-form-urlencoded');
    }

}
function form ( request ) { if ( isFormData ( request . body ) ) { request . headers . delete ( 'Content-Type' ) ; } else if ( isObject ( request . body ) && request . emulateJSON ) { request . body = Url . params ( request . body ) ; request . headers . set ( 'Content-Type' , 'application/x-www-form-urlencoded' ) ; } }
Form data Interceptor.
Form data Interceptor .