Axios 错误状态码 UnhandledPromiseRejectionWarning

Question

Using axios, I'm making GET requests to multiple links to test to see if they are broken links. If the GET requests returns an error, I want to log this error to the console and send it to the client side with socket. However, on some links (not all), I get an UnhandledPromiseRejectionWarning .

// check if the link is dead
axios.get(linkHref, {
   auth: {
     username: USERNAME,
     password: PASSWORD
   }
})
.then( (response) => {
  if (response.status != 200) {
    resultData = {
      text: linkText,
      url: linkHref,
      statusCode: String(response.status)
    }
    console.log(resultData);
    io.sockets.emit("result", resultData); // send link to client-side
  }
})
.catch( (error) => {
if (error) {
    resultData = {
      text: linkText,
      url: linkHref,
      statusCode: String(error.response.status) // this is where the error is
   }
   console.log(resultData);
   io.sockets.emit("result", resultData); // send link to client-side
  }
});

I expect it work correctly and return the status code of the error but sometimes I get a UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'status' of undefined error. But with my if statement in the .catch , I am checking to make sure that there is an error and that it is not undefined so I don't understand why I'm getting this error.

EDIT: Also, this works (does not show me that error) when I run it on my Mac but not in Windows ... why?

Answer 1

hey can you check by validating whether you are getting the response property on the error object in the if else condition

.catch( (error) => {
if (error.response) {
   //rest of the code...
  }
});

Answer 2

TypeError: Cannot read property 'status' of undefined The response property on error.response is not defined eg error = { response: undefined } . Therefore, referencing any properties on it throws an error. error.response[property]

Also on failed/hanging http requests the error argument is different. Checkout this gistaxios-catch-error . The error argument will have different properties for this case.