Flutter failed host lookup: (os error: no address associated with hostname, errno = 7)

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Flutter failed host lookup: (OS Error: No address associated with hostname, errno = 7)

When you encounter the error “Flutter failed host lookup: (OS Error: No address associated with hostname, errno = 7)” in your Flutter application, it means that the hostname you are trying to resolve does not have any associated IP address. This can occur due to various reasons, such as incorrect hostname, network connectivity issues, or DNS problems.

To troubleshoot and resolve this error, you can try the following steps:

  1. Check the hostname: Make sure you are using the correct hostname in your code. Double-check for any typos or misspellings. If the hostname is dynamic or fetched from an external source, ensure that it is being retrieved correctly.
  2. Verify network connectivity: Ensure that your device or emulator has a stable internet connection. Check if you can access other websites or services from your device to rule out any network issues.
  3. Check DNS configuration: The error can also occur if there is a problem with your DNS (Domain Name System) configuration. DNS translates domain names to IP addresses, allowing your device to connect to the server. You can try flushing your DNS cache or using a different DNS server to see if it resolves the issue.
  4. Try using IP address: Instead of using the hostname, you can also try using the IP address directly in your code. This bypasses the hostname resolution process and connects directly to the server. However, keep in mind that IP addresses can change, so this may not be a permanent solution.

Here’s an example of how you can modify your code to use the IP address instead of the hostname:

// Old code
http.get('https://example.com/api/data');

// Modified code using IP address directly
http.get('https://192.168.0.1/api/data');

By following these steps and considering the possible causes mentioned above, you should be able to resolve the “Flutter failed host lookup” error and establish a successful connection to the desired hostname or IP address.

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