Querystring or headers appear to be moving through redirects

[jakeleventhal]

I am using the reports section of Amazon's Advertising API to try to generate and download reports.

I am able to generate the reports just fine using the POST request, but when I try to use the GET request to download a report, I get an error about using multiple headers. What's strange though, is that when I use Postman to make the same exact GET request with the same headers, the request works just fine and I am able to download the data.

Here is my code:

const response = await request.get({
    headers: {
      'Amazon-Advertising-API-ClientId': `${process.env.ADS_API_CLIENT_ID}`,
      'Amazon-Advertising-API-Scope': profileId,
      Authorization: `Bearer ${accessToken}`,
      'Content-Type': 'application/json'
    },
    url: `https://advertising-api.amazon.com/v2/${api}`
  });

Here is the same request in Postman (that works)

And this is the error that I get when I try to make the request using request-promise:

(node:30398) UnhandledPromiseRejectionWarning: StatusCodeError: 400 - "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Error><Code>InvalidArgument</Code><Message>Only one auth mechanism allowed; only the X-Amz-Algorithm query parameter, Signature query string parameter or the Authorization header should be specified</Message><ArgumentName>Authorization</ArgumentName><ArgumentValue>Bearer mysecretval</ArgumentValue><RequestId>somerequestid</RequestId><HostId>somehostid</HostId></Error>"

What's also strange is that I am able to make other GET requests to the Amazon Advertising API without any problems. After doing some digging, I found out that the report download API route uses a redirect. The error message seems to suggest that headers/some querystring is being set in the background. There needs to be a way to disable this.

[jakeleventhal]

Update: I tried doing the "Code" option on Postman and was reproducing the same error when exporting as Node.js but not with Python using the requests library. I was also able to make it work with the Go version.

[hassanAwanAlvi]

You are probably missing a few headers because here we have some custom headers. Try diagnosing it with Wireshark or Fiddler.

[jakeleventhal]

I am not missing headers. I tried it both manually and by exporting the request from Postman to Node.js. Like I said, the same request works with the Python version

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