Hey channel, Trying to figure out making POST Mul...

# ktor

[Kamil K]

Hey channel,

Trying to figure out making POST MultiPartFormData using OkHttpEngine.
Looking at curl request executed in swagger where organs are described as
organs array[string] _(formData)._

-H 'accept: application/json' \
  -H 'Content-Type: multipart/form-data' \
  -F 'images=@IMG_20250327_125636.jpg;type=image/jpeg' \
  -F 'images=@IMG_20250327_125639.jpg;type=image/jpeg' \
  -F 'organs=leaf' \
  -F 'organs=auto'

I’ve arrived at this in ktor.

setBody(
    MultiPartFormDataContent(
        formData {
            organTagWithImageAsBytes.entries.forEach { (tag, file) ->
                append("images", file.readBytes(), Headers.build {
                    append(HttpHeaders.ContentType, ContentType.Image.JPEG)
                    append(HttpHeaders.ContentDisposition, "filename=\"${file.name}\"")
                    append("organs", tag)
                })
            }
        }
    )
)

In response I’ve receive default values of organs and not values that were sent. Where doing the call from swagger returns selected tag values. What’s the proper way of appending this data?

[Aleksei Tirman [JB]]

The problem is that you call the append("organs", tag) within the Headers.build block, which effectively adds the organs header. To solve the problem, move the append("organs", tag) call out of the block to append the form part.