Unable to call fromCognitoIdentityPool on iOS (browser) - crashes

[raRaRa]

Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

I just noticed that Chrome on iOS devices fails when calling fromCognitoIdentityPool. But it works on my desktop machine just fine with Chrome and Safari.

Example code:

  this.cachedCredentials = await fromCognitoIdentityPool({
      // Required. The unique identifier for the identity pool from which an identity should be
      // retrieved or generated.
      identityPoolId: this.options.IdentityPoolId,
      clientConfig: { region: this.options.Region },
  })();

The error I get:

DEBUG endpoints Resolving endpoint from template: {
  "url": "https://cognito-identity.{Region}.{PartitionResult#dnsSuffix}",
  "properties": {},
  "headers": {}
}

ERROR TypeError: JSON.stringify cannot serialize cyclic structures

Expected Behavior

I expect it to run through the last step where it errors out, which should log:

endpoints Resolved endpoint: {
  "headers": {},
  "properties": {},
  "url": "https://cognito-identity.eu-west-1.amazonaws.com/"
}

Current Behavior

Currently it errors on

DEBUG endpoints Resolving endpoint from template: {
  "url": "https://cognito-identity.{Region}.{PartitionResult#dnsSuffix}",
  "properties": {},
  "headers": {}
}

Regression Issue

• Select this option if this issue appears to be a regression.

SDK version number

@aws-sdk/credential-providers 3.664.0

Which JavaScript Runtime is this issue in?

Browser

Details of the browser/Node.js/ReactNative version

Latest Chrome on iOS - Chrome: 129.0.6668.90

Reproduction Steps

Call fromCognitoIdentityPool from Chrome in iOS

Observed Behavior

This error comes: ERROR TypeError: JSON.stringify cannot serialize cyclic structures

Expected Behavior

I expect this to log out:

endpoints Resolved endpoint: {
  "headers": {},
  "properties": {},
  "url": "https://cognito-identity.eu-west-1.amazonaws.com/"
}

Possible Solution

N/A

Additional Information/Context

N/A

[zshzbh]

Hey @raRaRa ,

Thanks for the feedback! Could you please add the following code so that we can see the request headers?

client.middlewareStack.add(next => async (args) => {
    console.log(args.request)
    const response = await next(args);
    console.log(response);
    return response;
   }, {step: 'finalizeRequest'}) 

Thanks!
Maggie

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