SharePoint REST API GetFileByServerRelativeUrl not working

 If you're encountering issues with the GetFileByServerRelativeUrl endpoint in the SharePoint REST API, there are a few potential reasons and troubleshooting steps you can take:

• Incorrect URL: Ensure that the URL you're providing is correctly formed and includes the server-relative URL of the file you want to retrieve. Double-check for any typos or missing components in the URL.
• Authentication: Make sure you have authenticated your API request properly. Depending on your scenario, you may need to include appropriate authentication headers such as Authorization or X-RequestDigest.
• Permissions: Verify that the user or application making the API call has sufficient permissions to access the file. Ensure that the account you are using has appropriate permissions to read the file at the provided server-relative URL.
• API version: Check the API version you are using. SharePoint REST API has different versions, and some endpoints may behave differently or have issues depending on the version you are targeting. Consider using the latest supported version for your SharePoint environment.
• Error handling: Inspect the response received from the API call for any error messages or status codes that might provide more information about the issue. The response might give you clues about what went wrong or whether any additional steps are required.
• SharePoint environment: If you are using SharePoint Online, ensure that there are no service outages or known issues affecting the GetFileByServerRelativeUrl endpoint. Check the Microsoft 365 Service Health Dashboard or the SharePoint admin center for any related notifications.
• Network connectivity: Confirm that your network connection is stable and not blocking the API requests. You can try accessing other SharePoint API endpoints or services to see if they are functioning correctly.

If none of these troubleshooting steps resolve your issue, it might be helpful to provide more specific details about the problem you're encountering, including the error message or response you receive, the SharePoint version you're using, and any relevant code snippets. This information can assist in diagnosing the problem more accurately.