Invoke-Restmethod multipart/form-data with json and a bin-file

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11 months, 1 week ago.

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  • #95889

    Points: 0
    Rank: Member

    Hello together,

    I´m trying to do a multipart/form-data request via powershell.
    A query-request with application/json is working but with multipart/form-data I get the following message:
    "Invalid Multipart/form request" and I hope you can help me to find the mistake.

    This is a example-request from the documentation – only "field_name" is a required field:

    ----WebKitFormBoundary7MA4YWxkTrZu0gW Content-Disposition: form-data; name="request"; Content-Type: application/json {
    "request": {
    "md5": "da855ff838250f45d528a5a05692f14e",
    "file_name": "MyFile.docx",
    "file_type": "docx",
    "features": ["te"],
    "te": {
    "reports": ["pdf", "xml"],
    "images": [
    "id": "7e6fe36e-889e-4c25-8704-56378f0830df",
    "revision": 1
    "id": "e50e99f3-5963-4573-af9e-e3f4750b55e2",
    "revision": 1
    }----WebKitFormBoundary7MA4YWxkTrZu0gW Content-Disposition: form-data; name="file"; filename="MyFile.docx" Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
    [Binary content of MyFile.docx] ----WebKitFormBoundary7MA4YWxkTrZu0gW

    And this is my code:

    $url = "https://foobar/tecloud/api/v1/file/upload"
    $boundary = [System.Guid]::NewGuid().ToString()
    $file = Get-Item -path $filePath
    $mimeType = [System.Web.MimeMapping]::GetMimeMapping($file.Name)
    $fileBin = [System.IO.File]::ReadAllBytes($filePath)
    #$CODEPAGE = "iso-8859-1"
    #$enc = [System.Text.Encoding]::GetEncoding($CODEPAGE)
    #$fileEnc = $enc.GetString($fileBin)
    $LF = "`r"
    $messageBody = @{
        request = @{ 
        file_name = $file.Name
        file_type = "sql"
    $bodyLines = (
            'Content-Disposition: form-data; name="request";',
            'Content-Type: application/json',
            (ConvertTo-Json $messageBody)+$LF,
            'Content-Disposition: form-data; name="file"; filename="test.txt"',
    		"Content-Type: $mimeType"+$LF,
    $Response=Invoke-Restmethod -Uri $url -Method Post -ContentType "multipart/form-data; boundary=$boundary" -Body $bodyLines -verbose
  • #95967

    Points: 1,811
    Helping HandTeam Member
    Rank: Community Hero

    Unfortunately I think constructing multipart MIME messages might be a little beyond what the everyday PowerShell user deals with :). I'm hoping you've found an answer for this, but if not, a broader community like StackOverflow might be a good place to look/ask. It's not really a PowerShell question, is the reason – any programmer needing to manually create a MIME-encoded message would deal with this.

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