SharePoint Document Issues

How to Fix SharePoint File Download Failures in Python

Elise Williams Sep 27, 2026 868 views

Question details

Users need to resolve an issue where a specific SharePoint file fails to download programmatically while other files work and the target file opens fine in a browser.

How to Troubleshoot SharePoint File Download Failures in Python

Product: SharePoint, Python, Power Automate
Device & OS: not provided
Scenario: Automating file downloads from SharePoint using a Python script or Microsoft Power Automate flow.
Observed behavior: One specific file consistently fails to download via the script or flow, despite the SharePoint service functioning normally in a standard web browser.

Before you start

Ensure you have the exact file path and name recorded, and verify that your Python script or Power Automate flow has the appropriate access tokens or API permissions configured before debugging.

Solution 1Recommended

Inspect File Name, Path, and Special Characters

Identify issues caused by unsupported characters, excessive path lengths, or incorrect URL encoding in your automation script.

Often, a script fails on a single file because of formatting anomalies in the file's name or metadata that a standard web browser automatically corrects.

Compare file details

Compare the exact name, directory path, and file extension of the failing file with the files that download successfully to spot any structural differences.

Check for special characters

Look for special characters such as '#', '%', '&', or trailing spaces in the filename. These characters require strict URL encoding when accessed via an API.

Verify path length

Ensure the total file path string does not exceed SharePoint's URL character limits, which can cause 'Get File Content' actions to throw an error.

Inspect File Name, Path, and Special Characters

URL Encoding in Python: If you are using Python's requests library, ensure you use urllib.parse.quote() to properly format the file path before appending it to your SharePoint API endpoint URL.

Solution 2

Verify Item-Level Permissions and Connections

Ensure the specific file doesn't have unique, restrictive permissions blocking API access.

Solution 3

Consult Developer Communities for Code Adjustments

If the file opens successfully in a browser, the SharePoint backend is active. The failure is likely isolated to how the code handles this specific file's payload.

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Frequently Asked Questions

Why does a SharePoint file download fine in the browser but fail in my Python script?

Web browsers automatically handle session cookies, authentication tokens, and complex URL encoding behind the scenes. A Python script requires you to explicitly provide these authentication headers and perfectly formatted URLs to interact with the SharePoint REST API without errors.

What HTTP error code usually indicates a permission issue when downloading SharePoint files via API?

A 401 Unauthorized or 403 Forbidden HTTP status code typically indicates that your automation script lacks the necessary Bearer token, or the service account does not have read access to that specific file's directory.

Can Power Automate bypass SharePoint special character limits?

No, Power Automate interacts with the same underlying SharePoint API. If a file contains invalid special characters, the 'Get file content' action may fail to resolve the path. Renaming the file to remove characters like '#' or '%' often immediately resolves the flow issue.

Document & File Issues