Required request part 'file' is not present error in Swift - ios

Question

I am trying to upload profile image to server using multipart file upload.
My code is
func uploadPhoto(image: UIImage, filePath: String, completion: #escaping uploadPhotoClosure) {
let imageData = image.jpegData(compressionQuality: 0.3)
let url = "https:www.somepath.com/uploadFile"
var request = URLRequest(url: URL(string: url)!)
request.httpMethod = "POST"
let boundary = UUID().uuidString
let contentType = "multipart/form-data; boundary=\(boundary)"
request.addValue(contentType, forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
var body = Data()
body.append("\r\n--\(boundary)--\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Disposition: form-data; name=\"file\"\r\n\r\n".data(using: String.Encoding.utf8)!)
body.append("field_mobileinfo_image".data(using: String.Encoding.utf8, allowLossyConversion: true)!)
body.append("\r\n--\(boundary)\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Disposition: form-data; name=\"files[field_mobileinfo_image]\"; filename=\"img.jpg\"\r\n".data(using: String.Encoding.utf8)!)
body.append("Content-Type: application/octet-stream\r\n\r\n".data(using: String.Encoding.utf8)!)
body.append(imageData!)
body.append("\r\n--\(boundary)\r\n".data(using: String.Encoding.utf8)!)
request.httpBody = body
self.serviceManager.async(request: request) { (innerClosure) in
do {
let response = try innerClosure()
guard let json = response.jsonObject else {
completion({ throw JSONErrorType.parsingError })
return
}
let jsonData = try JSONSerialization.data(withJSONObject: json, options: [])
let responseModel = try JSONDecoder().decode(EditProfilePhotoUploadResponse.self, from: jsonData)
completion({ return responseModel })
} catch {
completion({ throw error })
}
}
}
//servicemanager class
func async(request: URLRequest, completion: #escaping ServiceManagerAsyncCompletion) {
ServiceManager.log(request)
let task = self.urlSession.dataTask(with: request) { (data, response, error) in
guard error == nil else {
DispatchQueue.main.async {
completion({ throw error! })
}
return
}
guard let response = response as? HTTPURLResponse else {
DispatchQueue.main.async {
completion({ throw ServiceErrorType.invalidResponse })
}
return
}
ServiceManager.log(response, withBody: data)
//here handling status code
}
}
And the error from server is below
{
"status" : 500,
"message" : "Required request part 'file' is not present",
"timestamp" : "2022-08-05T05:30:55.415+0000",
"path" : "/uploadFile",
"error" : "Internal Server Error"
}
Any suggestions?

Answer 1

As your code does not contain a reproduclible example, this is just a long shot.
The final boundary is definitely wrong. It has to end with two "-" ticks.
e.g.
body.append("\r\n--\(boundary)--\r\n".data(using: String.Encoding.utf8)!)
but there might be more going on here.
Good article on multipart form data
RFC
The boundary header can be an arbitary string. But it has to be unique in the request to seperate it from the datastream. Also in the body it has to start with two "-" and the last boundary line in the request has to end with two "-" ticks also.