axios cancellation caught inside of then() instead of catch() - vue.js

Question

I making a multi-upload file form.
Upon user cancellation, once the corresponding axios call get cancelled using cancel(), I having a weird behaviour. My axios call get caught inside the then() whereas it should be caught inside of catch(). The response inside of then() returns undefined.
I am having a hard time figuring if I did something wrong on the front-end part, I think my call is may be missing some headers or maybe it's on the backend part ?
const payload = { file, objectId: articleId, contentType: 'article' };
const source = axios.CancelToken.source();
// callback to execute at progression
const onUploadProgress = (event) => {
const percentage = Math.round((100 * event.loaded) / event.total);
this.handleFileUploadProgression(file, {
percentage,
status: 'pending',
cancelSource: source,
});
};
attachmentService
.create(payload, { onUploadProgress, cancelToken: source.token })
.then((response) => {
// cancelation response ends up here with a `undefined` response content
})
.catch((error) => {
console.log(error);
// canceled request do not reads as errors down here
if (axios.isCancel(error)) {
console.log('axios request cancelled', error);
}
});
the service itself is defined below
export const attachmentService = {
create(payload, requestOptions) {
// FormData cannot be decamelized inside an interceptor so it's done before, here.
const formData = new FormData();
Object.entries(payload).forEach(([key, value]) =>
formData.append(decamelize(key), value),
);
return api
.post(resource, formData, {
headers: {
'Content-Type': 'multipart/form-data',
},
...requestOptions,
})
.then((response) => {
console.log(response, 'cancelled request answered here as `undefined`');
return response.data;
})
.catch((error) => {
// not caught here (earlier)
return error.data;
});
},
};
cancellation is called upon a file object doing
file.cancelSource.cancel('Request was cancelled by the user');

Answer 1

As suggested by #estus-flask in a comment, the issue is that I was catching the error inside of the service (too early). Thank you!
export const articleService = {
create(payload, requestOptions) {
// FormData cannot be decamelized inside an interceptor so it's done before, here.
const formData = new FormData();
Object.entries(payload).forEach(([key, value]) =>
formData.append(decamelize(key), value),
);
return api.post(resource, formData, {
headers: {
'Content-Type': 'multipart/form-data',
},
...requestOptions,
});
},
};