node.js - 如何在请求 Node 获取或 Node 中发送文件？

Question

如何在 Node 或 Node Fetch POST 请求中附加文件？我正在尝试调用将导入 CSV 或 XLS 文件的 API。这可以使用 Node 或 Node Fetch 吗？

Answer 1

README.md说:

Use native stream for body, on both request and response.

还有 sources indicate it supports several types ，如 Stream、Buffer、Blob... 并且还会尝试将其他类型强制转换为 String。

下面的代码片段显示了 3 个示例，所有示例均使用 v1.7.1 或 2.0.0-alpha5(另请参阅下面的其他示例，使用 FormData):

let fetch = require('node-fetch');
let fs = require('fs');

const stats = fs.statSync("foo.txt");
const fileSizeInBytes = stats.size;

// You can pass any of the 3 objects below as body
let readStream = fs.createReadStream('foo.txt');
//var stringContent = fs.readFileSync('foo.txt', 'utf8');
//var bufferContent = fs.readFileSync('foo.txt');

fetch('http://httpbin.org/post', {
    method: 'POST',
    headers: {
        "Content-length": fileSizeInBytes
    },
    body: readStream // Here, stringContent or bufferContent would also work
})
.then(function(res) {
    return res.json();
}).then(function(json) {
    console.log(json);
});

这里是foo.txt:

hello world!
how do you do?

注意:http://httpbin.org/post 使用 JSON 回复，其中包含已发送请求的详细信息。

结果:

{
  "args": {}, 
  "data": "hello world!\nhow do you do?\n", 
  "files": {}, 
  "form": {}, 
  "headers": {
    "Accept": "*/*", 
    "Accept-Encoding": "gzip,deflate", 
    "Connection": "close", 
    "Content-Length": "28", 
    "Host": "httpbin.org", 
    "User-Agent": "node-fetch/1.0 (+https://github.com/bitinn/node-fetch)"
  }, 
  "json": null, 
  "origin": "86.247.18.156", 
  "url": "http://httpbin.org/post"
}

如果您需要将文件作为具有更多参数的表单的一部分发送，您可以尝试:

• npm install form-data
• 传递一个FormData对象作为body(FormData是一种Stream，通过CombinedStream library)
• 不要在选项中传递 header(与上面的示例不同)

然后就可以了:

const formData = new FormData();
formData.append('file', fs.createReadStream('foo.txt'));
formData.append('blah', 42);
fetch('http://httpbin.org/post', {
    method: 'POST',
    body: formData
})

结果(只显示发送的内容):

----------------------------802616704485543852140629
Content-Disposition: form-data; name="file"; filename="foo.txt"
Content-Type: text/plain

hello world!
how do you do?

----------------------------802616704485543852140629
Content-Disposition: form-data; name="blah"

42
----------------------------802616704485543852140629--