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How to Fix Power Automate Invalid URI Errors in HTTP Actions

Maira Mehtab Sep 22, 2026 868 views

Question details

The user needs to resolve an issue where Power Automate HTTP actions reject extracted download links as invalid URIs when attempting to save email attachments or files to SharePoint.

Product: Microsoft Power Automate
Device & OS: not provided
Scenario: Extracting a download link from an email or external source to save an attachment or file to SharePoint using an HTTP action.
Observed behavior: The HTTP action fails, rejecting the extracted download link and displaying an invalid URI error.

Before you start

Ensure you have the exact output of the extracted URL from your previous flow run history to accurately verify its formatting.

Solution 1Recommended

Clean and Verify the Extracted Absolute HTTPS URL

Ensure the extracted download link is a fully formed, clean HTTPS URL without trailing spaces, line breaks, or hidden characters.

Power Automate's HTTP action requires a perfectly formatted absolute URI. If the extracted link contains HTML encoding, trailing whitespace, or hidden quotation marks, the action will fail.

Inspect the URL Output

Open your Power Automate flow run history and inspect the output of the specific step that extracts the URL.

Check for Invalid Characters

Look closely at the extracted string for HTML encoding, trailing characters, line breaks, or quotation marks that do not belong in a standard link.

Clean the URL String

Add a 'Compose' action before the HTTP action to clean the URL using string expressions, such as trim(outputs('Your_Extracted_URL')) to remove whitespaces.

Test the URL

Verify that the cleaned URL starts with 'https://' and test it manually in a web browser to ensure it resolves successfully.

URL Encoding Tip: If your extracted URL legitimately contains spaces, ensure you use the encodeUriComponent() function in Power Automate.

Solution 2

Configure the HTTP Action and SharePoint File Creation

Properly set up the HTTP action to download the file and correctly map the response body to the SharePoint action.

Solution 3

Consult the Microsoft Power Platform Community

If standard troubleshooting fails, the issue may be specific to a third-party connector or a complex authentication requirement.

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Frequently Asked Questions

Why does Power Automate say my URL is an invalid URI?

This error usually occurs when the extracted URL contains hidden characters, line breaks, HTML encoding, or is missing the absolute 'https://' prefix. Cleaning the string before passing it to the HTTP action resolves most invalid URI errors.

How do I remove hidden characters from a URL string in Power Automate?

You can use a Compose action with expressions like trim(outputs('Your_Step_Name')) to remove leading and trailing spaces, or use the replace() function to eliminate specific unwanted characters like quotation marks or line breaks.

Why does the SharePoint Create File action save a corrupted file after the HTTP action?

If the HTTP action completes but the saved file is corrupted, it often means the SharePoint 'File Content' is not mapped correctly. Ensure you are mapping the 'Body' output from the HTTP action, and verify that the original HTTP GET request downloaded the actual file rather than an HTML login page.

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