Guide on catching network errors using Axios request interceptor?

After encountering issues with our Vue application, I observed in the Sentry logs that the problem may stem from an unreliable network:

Error: Network Error
Error: Request aborted

I wanted to display a warning message to the user but couldn't find a way to do so. I attempted to capture these errors using an Axios request interceptor, but unfortunately, they were not caught. Has anyone else had success in achieving this?

UPDATE:

The interceptor I used that failed to work is shown below. On the other hand, I do have a response interceptor in place to handle 403 errors effectively.

axios.interceptors.request.use(undefined, (err) => {
  // This section never triggers for network errors
  return new Promise((resolve, reject) => {
    throw err;
  });
});

Answer №1

Have you given it a shot?

return Promise.reject(error);

Perhaps similar to this:

axios.interceptors.response.use(function (response) {
    // This function is triggered for any status code in the 2xx range
    // Manipulate response data here
    return response;
  }, function (error) {
    // This function is triggered for any status codes outside the 2xx range
    // Handle response error here
    return Promise.reject(error);
  });

Check out more details here:

Answer №2

The issue with the provided code snippet is that it functions as a request interceptor, executing before a request is sent. To handle network errors, utilize a response interceptor instead.

axiosInstance.interceptors.response.use(
  (response) => response,
  (error: Error | AxiosError) => {
    if (error instanceof CanceledError || error.message === 'Network Error') {
      // Manage timeout (CanceledError) or offline (Network Error) scenarios here
      // For instance, throw CustomError
    }
  });

It's advisable to store the above code in a separate file distinct from any UI components. In your Vue framework codebase, catch CustomError and display appropriate UI elements.

try {
  axiosInstance.get('/some-path')
} catch (error: Error) {
  if (error instanceof CustomError) {
    // Display UI elements
  }
}

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