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There could be multiple reasons for being unable to obtain both a response and cookie using the HTTP package in Flutter. Some of the common reasons could be:

1. Incorrect API endpoint: Ensure that the API endpoint you are trying to access is correct and active.

2. Invalid request parameters: Ensure that the request parameters you are passing to the API endpoint are valid and in the correct format.

3. Network connectivity issues: Check your internet connectivity to ensure that your device is able to communicate with the API server.

4. Cookie management issues: Ensure that you are correctly managing and storing cookies returned by the server.

5. Authentication issues: Ensure that you are passing any required authentication tokens or headers to the API endpoint.

6. Server-side limitations: Some servers may have limitations on the number of requests or requests from specific IP addresses. Ensure that you are not violating any server limitations.

7. SSL Errors: Ensure that the SSL certificates configured on server are valid and not expired.