How do we add DefaultRequestVersion on an HttpClient object in Powershell?

Question

I have been trying a way to add the Http Version as 1.0 in Powershell to my HttpClient Object.

  function Post-JSONData
    {
    Param
    (
        [Parameter(Mandatory=$True)] [String] $JSONPayload,
        [Parameter(Mandatory=$True)] [String] $ObjectClass,
        [Parameter(Mandatory=$True)] [String] $APIUrl,
        [Parameter(Mandatory=$False)] [String] $ProxyUrl
    )
    
    #Try{
    
        If($JSONPayload.StartsWith("[") -eq $false -and  $JSONPayload.EndsWith("]") -eq $false)
            { $JSONPayload = "[" + $JSONPayload + "]" }
        
        [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12;
    
        Add-Type -AssemblyName System.Net.Http
    
        $WebHandler = New-Object  System.Net.Http.HttpClientHandler
        $WebHandler.AllowAutoRedirect = $false;
    
        
        If($ProxyUrl)
        {
            $WebProxy = New-Object System.Net.WebProxy($ProxyUrl)
            $WebHandler.Proxy = $WebProxy
        }
    
    
    
        $HttpClient = New-Object System.Net.Http.HttpClient($WebHandler)
        **$HttpClient.DefaultRequestVersion = [System.Net.HttpVersion]::Version10**
        $HttpClient.DefaultRequestHeaders.Add("Accept","*/*");
        $HttpClient.DefaultRequestHeaders.Add("Cache-Control", "no-cache");
        $HttpClient.DefaultRequestHeaders.Add("Connection","keep-alive");
        $HttpClient.DefaultRequestHeaders.Add("Class",$ObjectClass);
    
    
        $HttpClient.Timeout = New-Object System.TimeSpan(0, 0, 90);
    
        $HttpJSONPayload = New-Object System.Net.Http.StringContent($JSONPayload.ToString(), [System.Text.Encoding]::UTF8, "application/json")
        $HttpJSONPayload.Headers.ContentEncoding.Add("gzip")
        $HttpJSONPayload.Headers.ContentEncoding.Add("deflate")
        $HttpJSONPayload.Headers.ContentEncoding.Add("br")
        
        $ResponsePayload = $HttpClient.PostAsync([Uri] $APIUrl,$HttpJSONPayload)

I am able to add the DefaultRequestHeader Parameters but I believe there is some issue with the format for DefaultRequestVersion.

I am unable to find documentation online either for the same.

Update: I am using Powershell V4.0 so $HttpClient.DefaultRequestVersion = [System.Net.HttpVersion]::Version10 is giving the following error:

The property 'DefaultRequestVersion' cannot be found on this object. Verify that the property exists and can be set.

Answer 1

The DefaultRequestVersion property is not a list, but a single HttpVersion value.

To default to HTTP 1.0, assign it like this:

$HttpClient.DefaultRequestVersion = [System.Net.HttpVersion]::Version10

Beware that the DefaultRequestVersion property was only introduced in .NET Core 3.0, so the earliest version of PowerShell with this property exposed is PowerShell 7.0.0

---

For PowerShell 4.0, you can change your code slightly to support overriding the HTTP Version by manually crafting the request and calling SendAsync() directly (instead of PostAsync()):

Take this line:

$ResponsePayload = $HttpClient.PostAsync([Uri] $APIUrl,$HttpJSONPayload)

... and replace it with:

# Manually craft the request message and overwrite the version
$RequestPayload = New-Object System.Net.Http.HttpRequestMessage @([System.Net.Http.HttpMethod]::Post, [uri]$APIUrl)
$RequestPayload.Version = '1.0'
$RequestPayload.Content = $HttpJSONPayload

# Pass the crafted message directly to SendAsync()
$ResponsePayload = $HttpClient.SendAsync($RequestPayload)