Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
Verified with Google Chrome — updated on July 10, 2026
Supported on: Microsoft Windows 7 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Google\Google Chrome\Network settings User Configuration\Administrative Templates\Google\Google Chrome\Network settings Description
This policy controls whether request methods are uppercased when matching with Access-Control-Allow-Methods response headers in CORS preflight. If the policy is Disabled, request methods are uppercased. This is the behavior on or before Google Chrome 108. If the policy is Enabled or not set, request methods are not uppercased, unless matching case-insensitively with DELETE, GET, HEAD, OPTIONS, POST, or PUT. This would reject fetch(url, {method: 'Foo'}) + "Access-Control-Allow-Methods: FOO" response header, and would accept fetch(url, {method: 'Foo'}) + "Access-Control-Allow-Methods: Foo" response header. Note: request methods "post" and "put" are not affected, while "patch" is affected. This policy is intended to be temporary and will be removed in the future.
Registry
Software\Policies\Google\Chrome Software\Policies\Google\Chrome Value name: AccessControlAllowMethodsInCORSPreflightSpecConformant
Enabled: AccessControlAllowMethodsInCORSPreflightSpecConformant = 1
Disabled: AccessControlAllowMethodsInCORSPreflightSpecConformant = 0
Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
Applying both scopes creates an ambiguous configuration (computer takes precedence over user). Only do this intentionally.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Microsoft Windows 7 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome]
"AccessControlAllowMethodsInCORSPreflightSpecConformant"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Windows 7 or later
$path = 'HKLM:\Software\Policies\Google\Chrome'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'AccessControlAllowMethodsInCORSPreflightSpecConformant' -Value 1 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Windows 7 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Google\Chrome' -Name 'AccessControlAllowMethodsInCORSPreflightSpecConformant' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Windows 7 or later
$path = 'HKLM:\Software\Policies\Google\Chrome'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'AccessControlAllowMethodsInCORSPreflightSpecConformant' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Windows 7 or later
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Windows 7 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Google\Chrome' -Name 'AccessControlAllowMethodsInCORSPreflightSpecConformant' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Make Access-Control-Allow-Methods matching in CORS preflight spec conformant
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Windows 7 or later
$path = 'HKLM:\Software\Policies\Google\Chrome'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'AccessControlAllowMethodsInCORSPreflightSpecConformant' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.