[string]$MultiPartBoundary = $null
    $ContentType= SelectHeaders -Headers $ContentTypes
    if ($ContentType) {
        $HeaderParameters['Content-Type'] = $ContentType # Use this line to see where I bodged this code
        if ($ContentType -eq 'multipart/form-data') {
            [string]$MultiPartBoundary = [System.Guid]::NewGuid()
            $MultiPartBoundary = "---------------------------$MultiPartBoundary"

            $HeaderParameters['Content-Type'] = "$ContentType; boundary=$MultiPartBoundary"
        }
    }

    # add default headers if any
    foreach ($header in $Configuration["DefaultHeaders"].GetEnumerator()) {
        $HeaderParameters[$header.Name] = $header.Value
    }

    # construct URL query string
    $HttpValues = [System.Web.HttpUtility]::ParseQueryString([String]::Empty)
    foreach ($Parameter in $QueryParameters.GetEnumerator()) {
        if ($Parameter.Value.Count -gt 1) { // array
            foreach ($Value in $Parameter.Value) {
                $HttpValues.Add($Parameter.Key + '[]', $Value)
            }
        } else {
            $HttpValues.Add($Parameter.Key,$Parameter.Value)
        }
    }
    # Build the request and load it with the query string.
    $UriBuilder = [System.UriBuilder]($RequestUri)
    $UriBuilder.Query = $HttpValues.ToString()

    # include form parameters in the request body
    if ($FormParameters -and $FormParameters.Count -gt 0) {
        if (![string]::IsNullOrEmpty($MultiPartBoundary)) {
            $RequestBody = ""
            $LF = "`r`n"
            $FormParameters.Keys | ForEach-Object {
                $value = $FormParameters[$_]
                $isFile = $value.GetType().FullName -eq "System.IO.FileInfo"

                $RequestBody += "--$MultiPartBoundary$LF"
                $RequestBody += "Content-Disposition: form-data; name=`"$_`""
                if ($isFile) {
                    $fileName = $value.Name
                    $RequestBody += "; filename=`"$fileName`"$LF"
                    $RequestBody += "Content-Type: application/octet-stream$LF$LF"
                    $RequestBody += Get-Content -Path $value.FullName
                } else {
                    $RequestBody += "$LF$LF"
                    $RequestBody += ([string]$value)
                }
                $RequestBody += "$LF--$MultiPartBoundary"
            }
            $RequestBody += "--"
        } else {
            $RequestBody = $FormParameters
        }
    }