Post a file to a URL with Powershell

deploy.ps1

# upload file with form-data to a URL using powershell
# this works with binary files, no conversion happens to the file
#
# this can be used to deploy files on Appveryor

$File='result.zip';
$FilePath = Get-Item -Path $File;
$URL = "https://example.com/upload.php";

$fileBytes = [System.IO.File]::ReadAllBytes($FilePath);
$fileEnc = [System.Text.Encoding]::GetEncoding('iso-8859-1').GetString($fileBytes);
$boundary = [System.Guid]::NewGuid().ToString(); 
$EOL = "`r`n";

$bodyLines = ( 
    "--$boundary",
    "Content-Disposition: form-data; name=`"file`"; filename=`"$File`"",
    "Content-Type: application/octet-stream",
    "",
    $fileEnc,
    "--$boundary",
    "Content-Disposition: form-data; name=`"filename`"",
    "",
    $File,
    "--$boundary",
    "Content-Disposition: form-data; name=`"apikey`"",
    "",
    "abcd",
    "--$boundary--",
    "" 
) -join $EOL

Invoke-RestMethod -Uri $URL -Method Post -ContentType "multipart/form-data; boundary=`"$boundary`"" -Body $bodyLines