Fixes #12682 - Add note about default request headers

[sdwheeler]

PR Summary

Add note about default request headers

• Fixes AB#546520
• Fixes Invoke-Restmethod - default headers #12682

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

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[Copilot]

Pull request overview

This pull request adds documentation about default HTTP request headers for the Invoke-WebRequest and Invoke-RestMethod cmdlets across multiple PowerShell versions. The documentation clarifies which headers are automatically included in HTTP requests and how users can override them.

Changes:

• Added documentation notes about default HTTP headers (Accept-Encoding, Host, User-Agent for PS 7.x; Host and User-Agent for PS 5.1)
• Updated ms.date metadata fields to reflect the current date (01/20/2026)
• Applied consistent documentation updates across PowerShell versions 5.1, 7.4, 7.5, and 7.6

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
reference/7.6/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	Added default headers documentation and updated metadata date
reference/7.6/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	Added default headers documentation and updated metadata date
reference/7.5/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	Added default headers documentation and updated metadata date
reference/7.5/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	Added default headers documentation and updated metadata date
reference/7.4/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	Added default headers documentation and updated metadata date
reference/7.4/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	Added default headers documentation and updated metadata date
reference/5.1/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	Added default headers documentation (without Accept-Encoding) and updated metadata date
reference/5.1/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	Added default headers documentation (without Accept-Encoding) and updated metadata date

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[learn-build-service-prod]

Learn Build status updates of commit 5af1660:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	✅Succeeded	View (powershell-5.1)
reference/5.1/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-5.1)
reference/7.4/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	✅Succeeded	View (powershell-7.4)
reference/7.4/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	✅Succeeded	View (powershell-7.5)
reference/7.5/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	✅Succeeded	View (powershell-7.6)
reference/7.6/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-7.6)

For more details, please refer to the build report.