上传文件 - Dify Docs

POST

files

upload

上传文件

curl --request POST \
  --url https://{api_base_url}/files/upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form 'user=<string>'

import requests

url = "https://{api_base_url}/files/upload"

files = { "file": ("example-file", open("example-file", "rb")) }
payload = { "user": "<string>" }
headers = {"Authorization": "Bearer <token>"}

response = requests.post(url, data=payload, files=files, headers=headers)

print(response.text)

const form = new FormData();
form.append('file', '<string>');
form.append('user', '<string>');

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

options.body = form;

fetch('https://{api_base_url}/files/upload', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{api_base_url}/files/upload",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: multipart/form-data"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{api_base_url}/files/upload"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://{api_base_url}/files/upload")
  .header("Authorization", "Bearer <token>")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{api_base_url}/files/upload")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--"

response = http.request(request)
puts response.read_body

{
  "conversation_id": null,
  "created_at": 1705407629,
  "created_by": "f1e2d3c4-b5a6-7890-abcd-ef1234567890",
  "extension": "png",
  "file_key": null,
  "id": "a1b2c3d4-5678-90ab-cdef-1234567890ab",
  "mime_type": "image/png",
  "name": "product-photo.png",
  "original_url": null,
  "preview_url": null,
  "reference": null,
  "size": 204800,
  "source_url": "https://upload.dify.ai/files/a1b2c3d4-5678-90ab-cdef-1234567890ab/file-preview?timestamp=1705407629&nonce=8b3e26a5&sign=rN5DXW3xkVGwGE5MSvptu_BhQVXpMbXWmVJ0ib0LMzI=",
  "tenant_id": "11223344-5566-7788-99aa-bbccddeeff00",
  "user_id": null
}

Authorizations

Authorization

string

header

required

每个请求都通过 API Key 认证：Authorization: Bearer {API_KEY}。应用接口使用应用 API Key，知识库接口使用知识库 API Key（快速开始）。

API Key 应保存在服务端，切勿嵌入客户端代码。缺失或无效的 Key 会返回 HTTP 401（unauthorized）。

Body

multipart/form-data

文件上传请求。需要 multipart/form-data 格式。

file

required

要上传的文件，作为 multipart/form-data 的一个部分。文件名不能包含 / 或 \。

除部署安全黑名单（UPLOAD_FILE_EXTENSION_BLACKLIST，默认为空）中的扩展名外，任何文件类型都可上传。

文件大小按类别限制：图片 10 MB、音频 50 MB、视频 100 MB、其他文件 15 MB（默认值，Dify Cloud 使用默认值）。自部署可通过 UPLOAD_*_FILE_SIZE_LIMIT 环境变量调整。

user

string

该上传所属的终端用户标识，由你的应用定义，需在应用内唯一。省略时上传归属于共享的 DEFAULT-USER。只有携带相同 user 的后续请求才能引用该文件。参见终端用户身份。

Response

文件上传成功。

conversation_id

string<uuid> | null

关联的会话 ID。

created_at

integer<int64>

上传时间戳（Unix 纪元秒）。

created_by

string<uuid> | null

上传者的终端用户 ID。可通过获取终端用户信息查询详情。

extension

string | null

文件扩展名。

file_key

string | null

未使用，始终为 null。

string<uuid>

唯一文件 ID。

mime_type

string | null

文件的 MIME 类型。

name

string

文件名。

original_url

string | null

文件的原始 URL。

preview_url

string | null

文件的预览 URL。

reference

string | null

在 Agent 和工具场景中附加文件时内部使用的不透明文件引用。通过此端点上传的文件始终为 null。

size

integer

文件大小（字节）。

source_url

string

文件的签名下载 URL。

tenant_id

string<uuid> | null

关联的租户 ID。

user_id

string<uuid> | null

未使用，始终为 null。

Last modified on September 9, 2026

上传文件

curl --request POST \
  --url https://{api_base_url}/files/upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form 'user=<string>'

import requests

url = "https://{api_base_url}/files/upload"

files = { "file": ("example-file", open("example-file", "rb")) }
payload = { "user": "<string>" }
headers = {"Authorization": "Bearer <token>"}

response = requests.post(url, data=payload, files=files, headers=headers)

print(response.text)

const form = new FormData();
form.append('file', '<string>');
form.append('user', '<string>');

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

options.body = form;

fetch('https://{api_base_url}/files/upload', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{api_base_url}/files/upload",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: multipart/form-data"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{api_base_url}/files/upload"

	payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://{api_base_url}/files/upload")
  .header("Authorization", "Bearer <token>")
  .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{api_base_url}/files/upload")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file\"; filename=\"example-file\"\r\nContent-Type: application/octet-stream\r\n\r\n<string>\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"user\"\r\n\r\n<string>\r\n-----011000010111000001101001--"

response = http.request(request)
puts response.read_body

{
  "conversation_id": null,
  "created_at": 1705407629,
  "created_by": "f1e2d3c4-b5a6-7890-abcd-ef1234567890",
  "extension": "png",
  "file_key": null,
  "id": "a1b2c3d4-5678-90ab-cdef-1234567890ab",
  "mime_type": "image/png",
  "name": "product-photo.png",
  "original_url": null,
  "preview_url": null,
  "reference": null,
  "size": 204800,
  "source_url": "https://upload.dify.ai/files/a1b2c3d4-5678-90ab-cdef-1234567890ab/file-preview?timestamp=1705407629&nonce=8b3e26a5&sign=rN5DXW3xkVGwGE5MSvptu_BhQVXpMbXWmVJ0ib0LMzI=",
  "tenant_id": "11223344-5566-7788-99aa-bbccddeeff00",
  "user_id": null
}