Have problem when use multipartBody

Hello,

I have a problem when using kohttp to upload an image when using multipartBody I have to upload an image and also needs some data like “name” and “id” like the attached image in Postman. I also need to add “Authorization” in the header.

below is my code

val path = "$serverURL"
        val response = httpPost {
            url(path)
            header {
                "content-type" to "multipart/form-data"
                "Authorization" to "Bearer " + myToken
            }
            multipartBody {
                +form("image",image)
                "name" to name
                "id" to "123"

            }
        }.eager()

The image cannot upload and seems like name & id also not send to the server. Can you help me if there is any wrong when I use kohttp to upload the file?

[rybalkinsd]

@rraayy Thanks for posting the comparison with okhttp! Now it’s much easier to detect the difference!

Let me do a comparison:

1. Request body type: MultipartBody.FORM is provided explicitly in the second example. However, we treat it as multipart/mixed b/c body parts are different.

2. +form ( ... ) uses null as content type by default. In the second example, MEDIA_TYPE_JPG is provided explicitly.

3. +form("image", image) will use your exact file.name, in the second example image.jpg is provided explicitly (probably it’s not your case, but want to mention it).

4. addFormDataPart("name", name) should be provided in a different way:

5. Order of parts inside the multipart body. It is different in the provided examples. It could lead to a problem on several servers.

As to conclude, I would recommend changing your request to the following:

   val response = httpPost {
            url(MYPATH)
            header {
                "Authorization" to "Bearer " + MYTOKEN
            }

            multipartBody(MULTIPART_FORM_TYPE) {
                +FormDataPart("image", "image.jpg", RequestBody.create(MEDIA_TYPE_JPG, image))
                +FormDataPart("name", null, RequestBody.create(null, name))
            }
    }

[rybalkinsd]

Closing this issue. Enhancements connected with UX feedback will be implemented in #126