使用节点http模块上传文件 [英] Uploading a file with node http module

问题描述

如何将文件上传到具有节点http模块的远程服务器（并且没有第三方库）？

我尝试了以下方法，但是不起作用我得到的服务器上没有数据）：

$ p $ 函数writeBinaryPostData（req，filepath）{
var fs = require（ 'FS'）;

var boundaryKey = Math.random（）。toString（16）; // random string
var boundaryStart =` - $ {boundaryKey} \r\\\
`，
boundaryEnd =`\r\\\
- $ {boundaryKey} - `，
contentDispositionHeader ='Content-Disposition：form-data; name =filefilename =file.txt\r\\\
'，
contentTypeHeader ='Content-Type：application / octet-stream \r\\\
'，
transferEncodingHeader = 'Content-Transfer-Encoding：binary \r\\\
';

var contentLength = Buffer.byteLength（
boundaryStart +
boundaryEnd +
contentDispositionHeader +
contentTypeHeader +
transferEncodingHeader
）+ fs.statSync（文件路径）.size;

var contentLengthHeader =`Content-Length：$ {contentLength} \r\\\
`;

req.setHeader（'Content-Length'，contentLength）;
req.setHeader（'Content-Type'，'multipart / form-data; boundary ='+ boundaryKey）;

req.write（
boundaryStart +
contentTypeHeader +
contentDispositionHeader +
transferEncodingHeader
）;

fs.createReadStream（filepath，{bufferSize：4 * 1024}）
.on（'data'，（data）=> {
req.write（data） ;
。）（'end'，（）=> {
req.write（boundaryEnd）;
req.end（）;
} ）;



解决方案

以下代码：

pre $函数writeBinaryPostData（req，filepath）{
var fs = require（'fs'），
data = fs.readFileSync（filepath）;

var crlf =\r\\\
，
boundaryKey = Math.random（）。toString（16），
boundary =` - $ {boundaryKey} `，
delimeter =`$ {crlf} - $ {boundary}`，
headers = [
'Content-Disposition：form-data; NAME = 文件; filename =test.txt'+ crlf
]，
closeDelimeter =`$ {delimeter} - `，
multipartBody;


multipartBody = Buffer.concat（[
new Buffer（delimeter + crlf + headers.join（''）+ crlf），
data，
新缓冲区（closeDelimeter）]
）;

req.setHeader（'Content-Type'，'multipart / form-data; boundary ='+ boundary）;
req.setHeader（'Content-Length'，multipartBody.length）;

req.write（multipartBody）;
req.end（）;
}

根据我找到的代码这里

How do I upload a file to a remote server with the node http module (and no 3rd party libs)?

I tried the following but it's not working (I get no data on the server):

function writeBinaryPostData(req, filepath) {
    var fs = require('fs');

    var boundaryKey = Math.random().toString(16); // random string
    var boundaryStart = `--${boundaryKey}\r\n`,
        boundaryEnd = `\r\n--${boundaryKey}--`,
        contentDispositionHeader = 'Content-Disposition: form-data; name="file" filename="file.txt"\r\n',
        contentTypeHeader = 'Content-Type: application/octet-stream\r\n',
        transferEncodingHeader = 'Content-Transfer-Encoding: binary\r\n';

    var contentLength = Buffer.byteLength(
        boundaryStart +
        boundaryEnd +
        contentDispositionHeader +
        contentTypeHeader +
        transferEncodingHeader
    ) + fs.statSync(filepath).size;

    var contentLengthHeader = `Content-Length: ${contentLength}\r\n`;

    req.setHeader('Content-Length', contentLength);
    req.setHeader('Content-Type',  'multipart/form-data; boundary=' + boundaryKey);

    req.write(
        boundaryStart +
        contentTypeHeader +
        contentDispositionHeader +
        transferEncodingHeader
    );

    fs.createReadStream(filepath, { bufferSize: 4 * 1024 })
        .on('data', (data) => {
            req.write(data);
        })
        .on('end', () => {
            req.write(boundaryEnd);
            req.end();
        });
}

解决方案

I got it working with the following code:

function writeBinaryPostData(req, filepath) {
    var fs = require('fs'),
        data = fs.readFileSync(filepath);

    var crlf = "\r\n",
        boundaryKey = Math.random().toString(16),
        boundary = `--${boundaryKey}`,
        delimeter = `${crlf}--${boundary}`,
        headers = [
          'Content-Disposition: form-data; name="file"; filename="test.txt"' + crlf
        ],
        closeDelimeter = `${delimeter}--`,
        multipartBody;


    multipartBody = Buffer.concat([
        new Buffer(delimeter + crlf + headers.join('') + crlf),
        data,
        new Buffer(closeDelimeter)]
    );

    req.setHeader('Content-Type', 'multipart/form-data; boundary=' + boundary);
    req.setHeader('Content-Length', multipartBody.length);

    req.write(multipartBody);
    req.end();
}

based on code I found here

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