powershell invoke-restmethod multipart/form-data

Question

I\'m currently trying to upload a file to a Webserver by using a REST API. And as mentioned I\'m using PowerShell for this. With curl this is no problem. The call looks like

Answer 1

I had some troubles trying to do the following curl command using Invoke-RestMethod:

curl --request POST \
  --url https://example.com/upload_endpoint/ \
  --header 'content-type: multipart/form-data' \
  --form 'file=@example.csv'
  -v

In my case, it turned out to be much easier to just use curl directly inside powershell.

$FilePath = "C:\example.csv"
$CurlExecutable = "C:\curl-7.54.1-win64-mingw\bin\curl.exe"

$CurlArguments = '--request', 'POST', 
                'https://example.com/upload_endpoint/',
                '--header', "'content-type: multipart/form-data'",
                '--form', "file=@$FilePath"
                '-v',

# Debug the above variables to see what's going to be executed
Write-Host "FilePath" $FilePath
Write-Host "CurlExecutable" $FilePath
Write-Host "CurlArguments" $CurlArguments

# Execute the curl command with its arguments
& $CurlExecutable @CurlArguments

Just grab the executable for your os on curl's website.

Why should I use curl instead of powershell's invoke-restmethod?

• Curl is free and open source software
• Easy to debug and supports many operating systems.
• Can be used in other shells as well
• Supports multiple protocols
• Many of the tools out there can generate curl commands
• Supports uploading files larger than 2GB (thanks for heads up Shukri Adams)