Hi everyone, I am using Ktor in Compose Multiplat...

# ktor

[Sofiane Abbar]

Hi everyone,

I am using Ktor in Compose Multiplatform.
Little question about Headers.build within a MultiPartFormDataContent.

return <http://client.post|client.post>("$API_URL//upload") {
            contentType(ContentType.MultiPart.FormData)
            setBody(
                MultiPartFormDataContent(
                    formData {
                        append("type", type)
                        append("file", image, Headers.build {
                            append(HttpHeaders.ContentType, "image/*")
                            append(
                                HttpHeaders.ContentDisposition,
                                "filename=$filename"
                            )
                        })
                    },
                )
            )
        }

My server always return HTTPException [Error]: Malformed FormData request. Content-Disposition header in FormData part is missing a name.
Well, I tried to make sure ContentDisposition is set properly, but when i check the request, it is never send.

Did I miss something?

Thanks a lot 🙏

[Aleksei Tirman [JB]]

I guess the problem is that the filename's value isn't surrounded by quotes. Can you try sending the ContentDisposition like in this example?

[Sofiane Abbar]

Thank you for reply. Yes I have tried from the documentation
But it doesn't work either.

append("file", image, Headers.build {
       append(HttpHeaders.ContentType, "image/*")
       append(HttpHeaders.ContentDisposition, "filename=\"$filename\"")
 })

Worth to mention that Postman works properly

[Sofiane Abbar]

I can see on the onUpload the size sent from the phone and what's receive on the server is same.
But I am still getting HTTPException [Error]: Malformed FormData request. Content-Disposition header in FormData part is missing a name.

[Aleksei Tirman [JB]]

I suggest comparing both requests made with Postman and Ktor via WireShark to determine the difference.

[Sofiane Abbar]

Thanks for the suggestion, I checked in detail and apparently the server mind the quote.
Postman Content-Disposition: form-data; name=*"type"*\r\n vs Ktor Content-Disposition: form-data; name=*type*\r\n
I had to add \" between the append name.

MultiPartFormDataContent(
                    formData {
                        append("\"type\"", type)

Thanks!
Don't know if there is any RFC related to this