Call failing because "Charset=UTF-8" appended to Content-Type header

[joyfullservice]

I am building an integration to a MIVA webstore and was baffled by why the API calls were not working from VBA-Web, but the identical call worked just fine from VSCode rest client.

After tracing the call in fiddler, I discovered the problem. For some reason the calls made through VBA-Web are changing the Content-Type header from application/json to application/json; Charset=UTF-8. The endpoint that I am calling is expecting exactly application/json, so it returns a failure base on the "wrong content type".

Why would it be appending the charset parameter, and how can I prevent it from doing so?

[zgrose]

Only place i see charset= in the current code is in FormatToMediaType which has. Maybe do a Search in your project and see if you find something else?

Public Function FormatToMediaType(Format As WebFormat, Optional CustomFormat As String) As String
    Select Case Format
    Case WebFormat.FormUrlEncoded
        FormatToMediaType = "application/x-www-form-urlencoded;charset=UTF-8"
    Case WebFormat.Json
        FormatToMediaType = "application/json"
    Case WebFormat.xml
        FormatToMediaType = "application/xml"
    Case WebFormat.Custom
        FormatToMediaType = web_GetConverter(CustomFormat)("MediaType")
    Case Else
        FormatToMediaType = "text/plain"
    End Select
End Function

[joyfullservice]

Thanks! I found https://stackoverflow.com/questions/35641883/winhttp-winhttprequest-adding-to-the-content-type which seems to be pointing me in the right direction... Doing some testing now. I will post back if I am able to find a workaround.