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How to upload local files to temporary storage space and get file URLs ​

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Multimodal models such as Qwen-VL require file URLs for image, video, and audio inputs. Model Studio provides free temporary storage if you lack public URLs: upload a file and get an oss:// URL valid for 48 hours.

Important

Temporary URLs are for development and testing only -- not for production, high-concurrency scenarios, or stress tests. For production workloads, use Object Storage Service (OSS) for long-term availability and to avoid rate limits.

Important

This feature is available only in the China (Beijing) region. Use an API key from this region.

How it works ​

  1. Upload a file and specify the target model. The API returns an oss:// URL.

  2. Pass that URL in your model call. You must complete Step 2 to use the temporary URL -- skipping it causes errors. For HTTP calls, add the header X-DashScope-OssResourceResolve: enable. The DashScope SDK adds this header automatically.

Limitations ​

ConstraintDetail
ConstraintDetail
File-model bindingSpecify the model name at upload. Use the same model in subsequent calls -- files cannot be shared across models. Each model enforces its own file size limit.
File-account bindingAPI keys for upload and model calls must belong to the same Alibaba Cloud account -- files cannot be shared across accounts.
48-hour expiryFiles are automatically deleted after 48 hours. Complete model calls within this period.
No post-upload managementFiles cannot be queried, modified, or downloaded -- they serve only as URL parameters in model calls.
Rate limitingThe upload credential API is limited to 100 QPS per account per model. Excess requests fail. The temporary storage does not support scale-out.

Prerequisites ​

Before you begin:

  • An API key configured as an environment variable

  • The model name that will consume the file (e.g., qwen-vl-plus)

Step 1: Get a temporary URL ​

Upload a file and get its temporary URL using one of these methods:

Upload with code

Upload with the CLI

Python

Java

Prerequisites

  • Python 3.8 or later

  • Install dependencies:

bash
pip install -U requests

Parameters

ParameterDescriptionExample
api_keyModel Studio API keyRead from DASHSCOPE_API_KEY environment variable
model_nameThe model that will consume the fileqwen-vl-plus
file_pathPath to the local file/tmp/cat.png

Example code

python
import os
import requests
from pathlib import Path
from datetime import datetime, timedelta

def get_upload_policy(api_key, model_name):
    """Get the file upload credential."""
    url = "https://dashscope-intl.aliyuncs.com/api/v1/uploads"
    headers = {
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json"
    }
    params = {
        "action": "getPolicy",
        "model": model_name
    }

    response = requests.get(url, headers=headers, params=params)
    if response.status_code != 200:
        raise Exception(f"Failed to get upload policy: {response.text}")

    return response.json()['data']

def upload_file_to_oss(policy_data, file_path):
    """Upload the file to the temporary OSS storage."""
    file_name = Path(file_path).name
    key = f"{policy_data['upload_dir']}/{file_name}"

    with open(file_path, 'rb') as file:
        files = {
            'OSSAccessKeyId': (None, policy_data['oss_access_key_id']),
            'Signature': (None, policy_data['signature']),
            'policy': (None, policy_data['policy']),
            'x-oss-object-acl': (None, policy_data['x_oss_object_acl']),
            'x-oss-forbid-overwrite': (None, policy_data['x_oss_forbid_overwrite']),
            'key': (None, key),
            'success_action_status': (None, '200'),
            'file': (file_name, file)
        }

        response = requests.post(policy_data['upload_host'], files=files)
        if response.status_code != 200:
            raise Exception(f"Failed to upload file: {response.text}")

    return f"oss://{key}"

def upload_file_and_get_url(api_key, model_name, file_path):
    """Upload the file and get the URL."""
    # 1. Get the upload credential (rate-limited to 100 QPS)
    policy_data = get_upload_policy(api_key, model_name)
    # 2. Upload the file to OSS
    oss_url = upload_file_to_oss(policy_data, file_path)

    return oss_url

# Example
if __name__ == "__main__":
    # Read the API key from the environment variable
    api_key = os.getenv("DASHSCOPE_API_KEY")
    if not api_key:
        raise Exception("Set the DASHSCOPE_API_KEY environment variable.")

    # Set the model name
    model_name="qwen-vl-plus"

    # Replace with the actual file path
    file_path = "/tmp/cat.png"

    try:
        public_url = upload_file_and_get_url(api_key, model_name, file_path)
        expire_time = datetime.now() + timedelta(hours=48)
        print(f"File uploaded successfully. URL valid for 48 hours.")
        print(f"Expiration time: {expire_time.strftime('%Y-%m-%d %H:%M:%S')}")
        print(f"Temporary URL: {public_url}")
        print("Note: When you use a temporary URL with the oss:// prefix, you must add the X-DashScope-OssResourceResolve: enable parameter to the HTTP request header. For more information, see https://www.alibabacloud.com/help/en/model-studio/get-temporary-file-url#http-call")

    except Exception as e:
        print(f"Error: {str(e)}")

Example output

File uploaded successfully. URL valid for 48 hours.
Expiration time: 2024-07-18 17:36:15
Temporary URL: oss://dashscope-instant/xxx/2024-07-18/xxx/cat.png
Note: When you use a temporary URL with the oss:// prefix, you must add the X-DashScope-OssResourceResolve: enable parameter to the HTTP request header. For more information, see https://www.alibabacloud.com/help/en/model-studio/get-temporary-file-url#http-call

Important

After obtaining the temporary URL, add the X-DashScope-OssResourceResolve: enable header to HTTP requests when making a call. For more information, see Call using HTTP.

Prerequisites

  • JDK 1.8 or later

  • Add the following dependencies to pom.xml:

xml
 <dependencies>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20230618</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.13</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.5.13</version>
        </dependency>
</dependencies>

Parameters

ParameterDescriptionExample
apiKeyModel Studio API keyRead from DASHSCOPE_API_KEY environment variable
modelNameThe model that will consume the fileqwen-vl-plus
filePathPath to the local filesrc/main/resources/tmp/cat.png

Example code

java
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.HttpStatus;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class PublicUrlHandler {

    private static final String API_URL = "https://dashscope-intl.aliyuncs.com/api/v1/uploads";

    public static JSONObject getUploadPolicy(String apiKey, String modelName) throws IOException {
        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
            HttpGet httpGet = new HttpGet(API_URL);
            httpGet.addHeader("Authorization", "Bearer " + apiKey);
            httpGet.addHeader("Content-Type", "application/json");

            String query = String.format("action=getPolicy&model=%s", modelName);
            httpGet.setURI(httpGet.getURI().resolve(httpGet.getURI() + "?" + query));

            try (CloseableHttpResponse response = httpClient.execute(httpGet)) {
                if (response.getStatusLine().getStatusCode() != 200) {
                    throw new IOException("Failed to get upload policy: " +
                            EntityUtils.toString(response.getEntity()));
                }
                String responseBody = EntityUtils.toString(response.getEntity());
                return new JSONObject(responseBody).getJSONObject("data");
            }
        }
    }

    public static String uploadFileToOSS(JSONObject policyData, String filePath) throws IOException {
        Path path = Paths.get(filePath);
        String fileName = path.getFileName().toString();
        String key = policyData.getString("upload_dir") + "/" + fileName;

        HttpPost httpPost = new HttpPost(policyData.getString("upload_host"));
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();

        builder.addTextBody("OSSAccessKeyId", policyData.getString("oss_access_key_id"));
        builder.addTextBody("Signature", policyData.getString("signature"));
        builder.addTextBody("policy", policyData.getString("policy"));
        builder.addTextBody("x-oss-object-acl", policyData.getString("x_oss_object_acl"));
        builder.addTextBody("x-oss-forbid-overwrite", policyData.getString("x_oss_forbid_overwrite"));
        builder.addTextBody("key", key);
        builder.addTextBody("success_action_status", "200");
        byte[] fileContent = Files.readAllBytes(path);
        builder.addBinaryBody("file", fileContent, ContentType.DEFAULT_BINARY, fileName);

        httpPost.setEntity(builder.build());

        try (CloseableHttpClient httpClient = HttpClients.createDefault();
             CloseableHttpResponse response = httpClient.execute(httpPost)) {
            if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
                throw new IOException("Failed to upload file: " +
                        EntityUtils.toString(response.getEntity()));
            }
            return "oss://" + key;
        }
    }

    public static String uploadFileAndGetUrl(String apiKey, String modelName, String filePath) throws IOException {
        JSONObject policyData = getUploadPolicy(apiKey, modelName);
        return uploadFileToOSS(policyData, filePath);
    }

    public static void main(String[] args) {
        // Read the API key from the environment variable
        String apiKey = System.getenv("DASHSCOPE_API_KEY");
        if (apiKey == null || apiKey.isEmpty()) {
            System.err.println("Set the DASHSCOPE_API_KEY environment variable.");
            System.exit(1);
        }
        // Model name
        String modelName = "qwen-vl-plus";
        // Replace with the actual file path
        String filePath = "src/main/resources/tmp/cat.png";

        try {
            // Check if the file exists
            File file = new File(filePath);
            if (!file.exists()) {
                System.err.println("File does not exist: " + filePath);
                System.exit(1);
            }

            String publicUrl = uploadFileAndGetUrl(apiKey, modelName, filePath);
            LocalDateTime expireTime = LocalDateTime.now().plusHours(48);
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

            System.out.println("File uploaded successfully. URL valid for 48 hours.");
            System.out.println("Expiration time: " + expireTime.format(formatter));
            System.out.println("Temporary URL: " + publicUrl);
            System.out.println("Note: When you use a temporary URL with the oss:// prefix, you must add the X-DashScope-OssResourceResolve: enable parameter to the HTTP request header. For more information, see https://www.alibabacloud.com/help/en/model-studio/get-temporary-file-url#http-call");
        } catch (IOException e) {
            System.err.println("Error: " + e.getMessage());
        }
    }
}

Example output

File uploaded successfully. URL valid for 48 hours.
Expiration time: 2024-07-18 17:36:15
Temporary URL: oss://dashscope-instant/xxx/2024-07-18/xxx/cat.png
Note: When you use a temporary URL with the oss:// prefix, you must add the X-DashScope-OssResourceResolve: enable parameter to the HTTP request header. For more information, see https://www.alibabacloud.com/help/en/model-studio/get-temporary-file-url#http-call

Important

After obtaining the temporary URL, add the X-DashScope-OssResourceResolve: enable header to HTTP requests when making a call. For more information, see Call using HTTP.

The DashScope CLI uploads a file with a single command and returns the temporary URL.

Prerequisites

  • Python 3.8 or later

  • DashScope Python SDK version 1.24.0 or later:

bash
pip install -U dashscope

CLI parameters

ParameterRequiredDescriptionExample
oss.uploadYesDashScope subcommand for file uploadoss.upload
--modelYesTarget model for the fileqwen-vl-plus
--fileYesLocal file path (relative or absolute)cat.png, /data/img.jpg
--api_keyNoAPI key. Not required if the DASHSCOPE_API_KEY environment variable is set.sk-xxxx

Upload with the environment variable (recommended)

Prerequisite: Configure the API key as an environment variable:

bash
dashscope oss.upload --model qwen-vl-plus --file cat.png

Sample output:

plaintext
Start oss.upload: model=qwen-vl-plus, file=cat.png, api_key=None
Uploaded oss url: oss://dashscope-instant/xxxx/2025-08-01/xxxx/cat.png

Upload with an inline API key

bash
dashscope oss.upload --model qwen-vl-plus --file cat.png --api_key sk-xxxxxxx

Sample output:

plaintext
Start oss.upload: model=qwen-vl-plus, file=cat.png, api_key=sk-xxxxxxx
Uploaded oss url: oss://dashscope-instant/xxx/2025-08-01/xxx/cat.png

Important

After obtaining the temporary URL, add the X-DashScope-OssResourceResolve: enable header to HTTP requests when making a call. For more information, see Call using HTTP.

Step 2: Call the model with the temporary URL ​

After uploading a file, use the oss:// URL in your model call. Two rules apply:

  • Model consistency: Use the same model you specified during upload.

  • Account consistency: Use an API key that belongs to the same Alibaba Cloud account.

Choose one of these methods:

HTTP ​

When calling the API over HTTP (curl, Postman, etc.), add this header:

X-DashScope-OssResourceResolve: enable

Without this header, the API cannot resolve oss:// URLs and requests fail.

Example request

This example calls qwen-vl-plus to describe an uploaded image.

Replace oss://... with your actual temporary URL.

bash
curl -X POST https://dashscope.aliyuncs.com/compatible-mode/v1/chat/completions \
-H "Authorization: Bearer $DASHSCOPE_API_KEY" \
-H 'Content-Type: application/json' \
-H 'X-DashScope-OssResourceResolve: enable' \
-d '{
  "model": "qwen-vl-plus",
  "messages": [{\
      "role": "user",\
      "content":\
      [{"type": "text","text": "What is this?"},\
       {"type": "image_url","image_url": {"url": "oss://dashscope-instant/xxx/2024-07-18/xxxx/cat.png"}}]\
    }]
}'

Example response

json
{
  "choices": [\
    {\
      "message": {\
        "content": "This is a picture of a white cat running on the grass. The cat has blue eyes and looks very cute and lively. The background is a blurred natural landscape, which emphasizes the subject: the small cat dashing forward. This photographic technique is called shallow depth of field (or a large aperture effect). It makes the cat in the foreground sharp and clear while blurring the background to highlight the subject and create a dreamlike effect. Overall, this photo feels relaxed and pleasant, and it captures a great moment of the animal's behavior.",\
        "role": "assistant"\
      },\
      "finish_reason": "stop",\
      "index": 0,\
      "logprobs": null\
    }\
  ],
  "object": "chat.completion",
  "usage": {
    "prompt_tokens": 1253,
    "completion_tokens": 104,
    "total_tokens": 1357
  },
  "created": 1739349052,
  "system_fingerprint": null,
  "model": "qwen-vl-plus",
  "id": "chatcmpl-cfc4f2aa-22a8-9a94-8243-44c5bd9899bc"
}

DashScope SDK ​

The DashScope SDK handles the X-DashScope-OssResourceResolve header automatically -- pass the oss:// URL directly as the file parameter.

The OpenAI SDK is not supported. Not all models support SDK calls -- see the specific model's API reference for details.

Python

Java

Prerequisite: DashScope Python SDK1.24.0 or later.

This example calls qwen-vl-plus to describe an uploaded image. This code applies to qwen-vl and omni models.

Replace oss://... in the image parameter with your actual temporary URL.

python
import os
import dashscope

messages = [\
    {\
        "role": "system",\
        "content": [{"text": "You are a helpful assistant."}]\
    },\
    {\
        "role": "user",\
        "content": [\
            {"image": "oss://dashscope-instant/xxx/2024-07-18/xxxx/cat.png"},\
            {"text": "What is this?"}]\
    }]

# If not configured as environment variable, replace with: api_key="sk-xxx"
api_key = os.getenv('DASHSCOPE_API_KEY')

response = dashscope.MultiModalConversation.call(
    api_key=api_key,
    model='qwen-vl-plus',
    messages=messages
)

print(response)

Example response

json
{
    "status_code": 200,
    "request_id": "ccd9dcfb-98f0-92bc-xxxxxx",
    "code": "",
    "message": "",
    "output": {
        "text": null,
        "finish_reason": null,
        "choices": [\
            {\
                "finish_reason": "stop",\
                "message": {\
                    "role": "assistant",\
                    "content": [\
                        {\
                            "text": "This is a photo of a cat running on the grass. The cat's fur is mainly white with light brown spots, and its eyes are blue, making it look very cute. The background is a blurry green meadow with some trees, and the sunlight adds a warm feeling to the whole picture. The cat's posture shows that it is moving quickly, possibly chasing something or just enjoying the outdoors. Overall, this is a vibrant and lively picture."\
                        }\
                    ]\
                }\
            }\
        ]
    },
    "usage": {
        "input_tokens": 1112,
        "output_tokens": 91,
        "input_tokens_details": {
            "text_tokens": 21,
            "image_tokens": 1091
        },
        "prompt_tokens_details": {
            "cached_tokens": 0
        },
        "total_tokens": 1203,
        "output_tokens_details": {
            "text_tokens": 91
        },
        "image_tokens": 1091
    }
}

Prerequisite: DashScope Java SDK2.21.0 or later.

This example calls qwen-vl-plus to describe an uploaded image. This code applies to qwen-vl and omni models.

Replace oss://... with your actual temporary URL.

java
import com.alibaba.dashscope.aigc.multimodalconversation.*;
import com.alibaba.dashscope.common.Role;
import com.alibaba.dashscope.exception.ApiException;
import com.alibaba.dashscope.exception.NoApiKeyException;
import com.alibaba.dashscope.exception.UploadFileException;
import com.alibaba.dashscope.utils.JsonUtils;

import java.util.Arrays;

public class MultiModalConversationUsage {

    private static final String modelName = "qwen-vl-plus";

    // If not configured as environment variable, replace with: api_key="sk-xxx"
    public static String apiKey = System.getenv("DASHSCOPE_API_KEY");

    public static void simpleMultiModalConversationCall() throws ApiException, NoApiKeyException, UploadFileException {
        MultiModalConversation conv = new MultiModalConversation();
        MultiModalMessageItemText systemText = new MultiModalMessageItemText("You are a helpful assistant.");
        MultiModalConversationMessage systemMessage = MultiModalConversationMessage.builder()
                .role(Role.SYSTEM.getValue()).content(Arrays.asList(systemText)).build();
        MultiModalMessageItemImage userImage = new MultiModalMessageItemImage(
                "oss://dashscope-instant/xxx/2024-07-18/xxxx/cat.png");
        MultiModalMessageItemText userText = new MultiModalMessageItemText("What is this?");
        MultiModalConversationMessage userMessage =
                MultiModalConversationMessage.builder().role(Role.USER.getValue())
                        .content(Arrays.asList(userImage, userText)).build();
        MultiModalConversationParam param = MultiModalConversationParam.builder()
                .model(MultiModalConversationUsage.modelName)
                .apiKey(apiKey)
                .message(systemMessage)
                .vlHighResolutionImages(true)
                .vlEnableImageHwOutput(true)
//                .incrementalOutput(true)
                .message(userMessage).build();
        MultiModalConversationResult result = conv.call(param);
        System.out.print(JsonUtils.toJson(result));

    }

    public static void main(String[] args) {
        try {
            simpleMultiModalConversationCall();
        } catch (ApiException | NoApiKeyException | UploadFileException e) {
            System.out.println(e.getMessage());
        }
        System.exit(0);
    }

}

Example response

json
{
    "requestId": "b6d60f91-4a7f-9257-xxxxxx",
    "usage": {
        "input_tokens": 1112,
        "output_tokens": 91,
        "total_tokens": 1203,
        "image_tokens": 1091,
        "input_tokens_details": {
            "text_tokens": 21,
            "image_tokens": 1091
        },
        "output_tokens_details": {
            "text_tokens": 91
        }
    },
    "output": {
        "choices": [\
            {\
                "finish_reason": "stop",\
                "message": {\
                    "role": "assistant",\
                    "content": [\
                        {\
                            "text": "This is a photo of a cat running on the grass. The cat's fur is mainly white with light brown spots, and its eyes are blue, making it look very cute. The background is a blurry green meadow with some trees, and the sunlight adds a warm feeling to the whole picture. The cat's posture shows that it is moving quickly, possibly chasing something or just enjoying the outdoors. Overall, this is a vibrant and lively picture."\
                        },\
                        {\
                            "image_hw": [\
                                [\
                                    "924",\
                                    "924"\
                                ]\
                            ]\
                        }\
                    ]\
                }\
            }\
        ]
    }
}

API reference ​

The code samples and CLI in Step 1 wrap these three API operations internally. Use this reference to implement the upload flow manually.

Get a file upload credential ​

http
GET https://dashscope.aliyuncs.com/api/v1/uploads

Important

The credential API is rate-limited to 100 QPS per account per model. The temporary storage cannot be scaled out. For production or high-concurrency workloads, use Alibaba Cloud OSS.

Request parameters ​

LocationFieldTypeRequiredDescriptionExample
LocationFieldTypeRequiredDescriptionExample
HeaderContent-Type_string_YesRequest type.application/json
HeaderAuthorization_string_YesModel Studio API key.Bearer sk-xxx
Paramsaction_string_YesOperation type. Set to getPolicy.getPolicy
Paramsmodel_string_YesTarget model name.qwen-vl-plus

Response parameters ​

FieldTypeDescriptionExample
FieldTypeDescriptionExample
request_id_string_Unique request ID.7574ee8f-...-11c33ab46e51
data_object_--
data.policy_string_Upload credential.eyJl...1ZSJ9XX0=
data.signature_string_Credential signature.g5K...d40=
data.upload_dir_string_Upload directory path.dashscope-instant/xxx/2024-07-18/xxxx
data.upload_host_string_OSS host for uploading.https://dashscope-file-xxx.oss-cn-beijing.aliyuncs.com
data.expire_in_seconds_string_Credential validity in seconds. Get a new credential after expiry.300
data.max_file_size_mb_string_Maximum upload file size in MB. Varies by model.100
data.capacity_limit_mb_string_Daily upload capacity per Alibaba Cloud account in MB.999999999
data.oss_access_key_id_string_Access key for the upload.LTAxxx
data.x_oss_object_acl_string_Uploaded file access permission. private means the file is private.private
data.x_oss_forbid_overwrite_string_Whether overwriting files with the same name is blocked. true means overwriting is blocked.true

Sample request ​

bash
curl --location 'https://dashscope.aliyuncs.com/api/v1/uploads?action=getPolicy&model=qwen-vl-plus' \
--header "Authorization: Bearer $DASHSCOPE_API_KEY" \
--header 'Content-Type: application/json'

If the API key is not configured as an environment variable, replace $DASHSCOPE_API_KEY with your API key: --header "Authorization: Bearer sk-xxx".

Sample response ​

json
{
    "request_id": "52f4383a-c67d-9f8c-xxxxxx",
    "data": {
        "policy": "eyJl...1ZSJ=",
        "signature": "eWy...=",
        "upload_dir": "dashscope-instant/xxx/2024-07-18/xxx",
        "upload_host": "https://dashscope-file-xxx.oss-cn-beijing.aliyuncs.com",
        "expire_in_seconds": 300,
        "max_file_size_mb": 100,
        "capacity_limit_mb": 999999999,
        "oss_access_key_id": "LTA...",
        "x_oss_object_acl": "private",
        "x_oss_forbid_overwrite": "true"
    }
}

Upload the file to temporary storage ​

http
POST {data.upload_host}

Replace {data.upload_host} with the data.upload_host from the credential response.

Request parameters ​

LocationFieldTypeRequiredDescriptionExample
LocationFieldTypeRequiredDescriptionExample
HeaderContent-Type_string_NoSubmit the form as multipart/form-data. The boundary is automatically generated by your HTTP client.multipart/form-data; boundary=9431149156168
form-dataOSSAccessKeyId_text_Yesdata.oss_access_key_id from the credential response.LTAm5xxx
form-datapolicy_text_Yesdata.policy from the credential response.g5K...d40=
form-dataSignature_text_Yesdata.signature from the credential response.Sm/tv7DcZuTZftFVvt5yOoSETsc=
form-datakey_text_Yesdata.upload_dir from the credential response, appended with /<filename>.dashscope-instant/xxx/2024-07-18/xxx/cat.png
form-datax-oss-object-acl_text_Yesdata.x_oss_object_acl from the credential response.private
form-datax-oss-forbid-overwrite_text_Yesdata.x_oss_forbid_overwrite from the credential response.true
form-datasuccess_action_status_text_NoHTTP status code returned on success. Typically 200.200
form-datafile_file_YesThe file to upload. Only one file per request. The file field must be the last form field.file=@"/tmp/cat.png"

On success, the API returns HTTP 200 with no response body.

Sample request ​

bash
curl --location 'https://dashscope-file-xxx.oss-cn-beijing.aliyuncs.com' \
--form 'OSSAccessKeyId="LTAm5xxx"' \
--form 'Signature="Sm/tv7DcZuTZftFVvt5yOoSETsc="' \
--form 'policy="eyJleHBpcmF0aW9 ... ... ... dHJ1ZSJ9XX0="' \
--form 'x-oss-object-acl="private"' \
--form 'x-oss-forbid-overwrite="true"' \
--form 'key="dashscope-instant/xxx/2024-07-18/xxx/cat.png"' \
--form 'success_action_status="200"' \
--form 'file=@"/tmp/cat.png"'

Construct the file URL ​

Concatenate oss:// with the key from the upload request. This URL is valid for 48 hours.

plaintext
oss://dashscope-instant/xxx/2024-07-18/xxxx/cat.png

Error codes ​

If API calls fail, see Error messages for general troubleshooting.

These error codes are specific to temporary file uploads:

HTTP statusError codeError messageCause and resolution
HTTP statusError codeError messageCause and resolution
400invalid_parameter_errorInternalError.Algo.InvalidParameter: The provided URL does not appear to be valid. Ensure it is correctly formatted.The URL is malformed. Verify the URL format. If using an oss:// URL over HTTP, add the X-DashScope-OssResourceResolve: enable header.
400InvalidParameter.DataInspectionThe media format is not supported or incorrect for the data inspection.The request header is missing X-DashScope-OssResourceResolve: enable, or the file format is not supported by the model. See Error messages.
403AccessDeniedInvalid according to Policy: Policy expired.The upload credential has expired. Call the credential API again to get a new one.
429Throttling.RateQuotaRequests rate limit exceeded, please try again later.The request rate exceeds 100 QPS. Reduce the request frequency, or migrate to OSS for production workloads.

FAQ ​

What should I do if an oss:// URL returns an error? ​

Follow these steps:

  1. Check the request header. If calling the API over HTTP (curl, Postman, etc.), add X-DashScope-OssResourceResolve: enable to the request header. Without this header, the server cannot resolve the oss:// protocol. The DashScope SDK adds this header automatically.

  2. Check URL validity. The oss:// URL expires 48 hours after upload. If expired, upload the file again to get a new URL.

Can I use different API keys for file upload and model calls? ​

Yes, as long as both API keys belong to the same Alibaba Cloud account. File access is managed at the account level, not the API key level.

API keys from different Alibaba Cloud accounts cannot access each other's uploaded files.

Previous: Model calls in a sub-workspaceNext: Configure connection reuse for DashScope SDK

Is this page helpful?

How it works

Limitations

Prerequisites

Step 1: Get a temporary URL

Step 2: Call the model with the temporary URL

HTTP

DashScope SDK

API reference

Get a file upload credential

Upload the file to temporary storage

Construct the file URL

Error codes

FAQ

What should I do if an oss:// URL returns an error?

Can I use different API keys for file upload and model calls?

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