如何将二进制图像上传到 kotlin 中的 AWS 预签名 url？

Question

使用以下代码在流中上传图像时获取 403 响应代码。

val stream = ByteArrayOutputStream()
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream)//bitmap is the bitmap of the image
                val byteArray = stream.toByteArray()
                val encodedImage = Base64.encodeToString(byteArray, Base64.DEFAULT)
                val requestBody : RequestBody = encodedImage.toRequestBody()// for base64 format              
                
                
                val url = response.body()?.get(0)!!.presigned_upload_url
                val baseUrl = url.split(".com").toTypedArray()[0] + ".com"
                var queryUrl: String? = url.split(".com").toTypedArray()[1]
                 println(baseUrl)
                 println(queryUrl)

                val client = OkHttpClient.Builder().build()

                val retrofit_image_upload: Retrofit = Retrofit.Builder()
                    .baseUrl(baseUrl)
                    .addConverterFactory(GsonConverterFactory.create())
                    .client(client)
                    .build()

              
                var request1 = retrofit_image_upload.create(Api::class.java)
                try {
                    request1.upload(
                        url,
                        fileSize,//size of the image
                        requestBody,
                    ).enqueue(
                        object : retrofit2.Callback<Void> {
                            override fun onResponse(call: Call<Void>, response: Response<Void>) {
                                println(response.code().toString())
                            }
                            override fun onFailure(call: Call<Void>, t: Throwable) {
                                println(t.toString())
                            }
                        }
                    )
                } catch (e: IOException) {
                    e.printStackTrace()
                }

还转换了流中的请求体，但结果是相同的。 Url 工作正常，通过 postman 检查。