从 NodeJs 服务器端上传文件时遇到问题，找到了 100 个帖子并进行了研究，但没有任何效果，将不胜感激。
应用程序的结构
Front App - React Admin 框架接收文件，我在 base64 中编码图像的内容以发送到 API
后端 - NestJS 应用程序 - 在 API 中接收 base64 图像
从我的后端 API 需要将文件发送到外部后端（Python API）进行上传 - 这就是问题所在
请看下面我的代码，JS文件有问题
我尝试了几种方法，但都以同样的错误结束
1 解决方案
import axios from 'axios';
import FormData from 'form-data';
export async function upload(
fileBase64: string,
filename: string
): Promise<any> {
const buffer = Buffer.from(fileBase64, 'base64')
const extension = fileBase64.substring(fileBase64.indexOf('/') + 1, fileBase64.indexOf(";base64"))
const cleanBase64 = fileBase64.replace(/^data:image\/png;base64,/, '')
const cleanImageBuffer = Buffer.from(cleanBase64, 'base64')
const formData = new FormData();
// have tried to pass as well cleanImageBuffer but no changes
formData.append('file', buffer);
formData.append('fileName', filename + '.' + extension);
formData.append('namespace', 'test');
return await axios
.post('external_api_url', JSON.stringify(formData), {
headers: {
Authorization: `Bearer token`,
ContentType: 'multipart/form-data'
}
})
.then((response) => {
console.log('response = ' + JSON.stringify(response))
})
结果1解决方案
{
"status": "error",
"error": {
"code": "bad_request",
"message": "file Expected UploadFile, received: <class 'str'>"
}
}
2 解决方案
export async function upload (
fileBase64: string,
filename: string
): Promise<any> {
const extension = fileBase64.substring(fileBase64.indexOf('/') + 1, fileBase64.indexOf(";base64"))
const cleanBase64 = fileBase64.replace(/^data:image\/png;base64,/, '')
const TMP_UPLOAD_PATH = '/tmp'
if (!fs.existsSync(TMP_UPLOAD_PATH)) {
fs.mkdirSync(TMP_UPLOAD_PATH);
}
fs.writeFile(TMP_UPLOAD_PATH + '/' + filename + '.' + extension, cleanBase64, 'base64', function(err) {
console.log(err);
})
const fileStream = fs.createReadStream(TMP_UPLOAD_PATH + '/' + filename + '.' + extension)
const formData = new FormData();
formData.append('file', fileStream, filename + '.' + extension);
formData.append('fileName', filename + '.' + extension);
formData.append('namespace', 'test');
return await axios
.post('external_api_url', formData, {
headers: {
Authorization: `Bearer token`,
ContentType: 'multipart/form-data'
}
})
.then((response) => {
console.log('response = ' + JSON.stringify(response))
})
}
结果2解决方案
{
"status": "error",
"error": {
"code": "bad_request",
"message": "file Expected UploadFile, received: <class 'str'>"
}
}
以相同结果结束的其他解决方案
我需要的最佳场景
将不胜感激
下面是一个有效但不是 JS 的 python 示例（JS 无效）
import requests
url = "http://127.0.0.1:8000/external_api"
payload={'namespace': 'test'}
files=[
('file',('lbl-pic.png',open('/local/path/lbl-pic.png','rb'),'image/png'))
]
headers = {
'Authorization': 'Bearer token'
}
response = requests.request("POST", url, headers=headers, data=payload, files=files)
print(response.text)
只是一个建议：
我想发布我的解决方案，因为正如我在互联网上看到的那样，每个人都对
FormDatanodejsaxiosaxiosFormDataContent-LengthContent-Length如果此标头在 python API 中变为可选，则代码开始工作
解决方案是如果有人有类似的问题
Content-LengthFormDataContent-Length在 axios GitHub 问题上说这个错误在最新的 axios 中已修复，但在我的情况下它仍然不起作用
下面是使用缓冲区的代码，第三个 API 不需要 Content-Length
function upload (image: {imageBase64: string, fileName: string}) {
const { imageBase64, fileName } = image;
const cleanBase64 = imageBase64.substr(imageBase64.indexOf(',') + 1);
// buffer should be clean base64
const buffer = Buffer.from(cleanBase64, 'base64');
const formData = new FormData();
// filename as option is required, otherwise will not work, will say that received file is string and UploadFile
formData.append('file', buffer, { filename: fileName });
return client
.post('url', formData, {
headers: {
...formData.getHeaders(),
},
})
.then((response) => response.data)
.catch((error) => {
return {
status: 'error',
error,
};
});
}