use ["std", "okhttp"]

// https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PostMultipart.java

println okhttp.request()
    .header("Authorization", "Client-ID 9199fdef135c122")
    .url("https://api.imgur.com/3/image")
    .post(MultipartBody.builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("title", "Sample image")
        .addFormDataPart("image", "image.png", RequestBody.file("image/png", "image.png"))
        .build()
    )
    .newCall(okhttp.client)
    .execute()
    .body()
    .string()