Invoke-RestMethod/Invoke-WebRequest should set charset=utf-8 for application/json by default

Recently had an issue trying to use a GitHub API when I put emojis in the POST body:

$body = ConvertFrom-Json @{
    tag_name = "tag"
    name = "demo"
    body = "I like 🐛s"
    draft = $true
    prerelease = $true
}

$uri = "https://api.github.com/repos/me/bughunter/releases"
$headers = @{
    GitHubToken = $myToken
    Accept = "application/vnd.github.v3+json"
}

Invoke-RestMethod -Method Post -Uri $uri -Body $body -Headers $headers

Sending this published a draft with the description:

I like ??s

Took me a while to work out I needed -ContentType "application/json; charset=utf-8", which is fine. Except everything else defaulted (as expected) to UTF-8, so I assumed this would too.

[SteveL-MSFT]

Given that our console and output encoding default to utf-8, it seems like the webcmdlets should also follow with utf-8 as default charset unless overridden. cc @markekraus

[CodeShane]

That’s a UTF8 BOM encoded as ASCII or other non- Saw it take down a production service a few jobs ago when an xml feed encoded in UTF-8 decided to also send the optional BOM.

 U+FEFF Byte Order Mark