[英]NodeJS Request how to send multipart/form-data POST request
我正在嘗試將 POST 請求發送到請求中包含圖像的 API。 我正在使用請求模塊執行此操作,但我嘗試的所有操作均無效。 我當前的代碼:
const options = {
method: "POST",
url: "https://api.LINK.com/file",
port: 443,
headers: {
"Authorization": "Basic " + auth,
"Content-Type": "multipart/form-data"
},
form : {
"image" : fs.readFileSync("./images/scr1.png")
}
};
request(options, function (err, res, body) {
if(err) console.log(err);
console.log(body);
});
但是請求使用Content-Type: application/x-www-form-urlencoded
出於某種原因......我該如何解決這個問題?
正如文檔中所解釋的,表單multipart/form-data
請求正在使用form-data
數據庫。 所以你需要提供formData
選項而不是form
選項。
const options = {
method: "POST",
url: "https://api.LINK.com/file",
port: 443,
headers: {
"Authorization": "Basic " + auth,
"Content-Type": "multipart/form-data"
},
formData : {
"image" : fs.createReadStream("./images/scr1.png")
}
};
request(options, function (err, res, body) {
if(err) console.log(err);
console.log(body);
});
惱火的是,幾乎所有解決此問題的示例解決方案都包含第三方模塊。 我知道簡單地包含一個模塊並復制/粘貼一個代碼示例通常更容易,但對於像這樣的基本 HTTP 概念來說真的不需要一個。 添加模塊可以快速增加您在 AWS lambda 等雲環境中的占用空間,其中總解決方案文件大小會極大地影響運行時性能。 我在這里找到了這個有用的例子,
https://tanaikech.github.io/2017/07/27/multipart-post-request-using-node.js/
var fs = require('fs');
var request = require('request');
var upfile = 'sample.zip';
fs.readFile(upfile, function(err, content){
if(err){
console.error(err);
}
var metadata = {
token: "### access token ###",
channels: "sample",
filename: "samplefilename",
title: "sampletitle",
};
var url = "https://slack.com/api/files.upload";
var boundary = "xxxxxxxxxx";
var data = "";
for(var i in metadata) {
if ({}.hasOwnProperty.call(metadata, i)) {
data += "--" + boundary + "\r\n";
data += "Content-Disposition: form-data; name=\"" + i + "\"; \r\n\r\n" + metadata[i] + "\r\n";
}
};
data += "--" + boundary + "\r\n";
data += "Content-Disposition: form-data; name=\"file\"; filename=\"" + upfile + "\"\r\n";
data += "Content-Type:application/octet-stream\r\n\r\n";
var payload = Buffer.concat([
Buffer.from(data, "utf8"),
new Buffer(content, 'binary'),
Buffer.from("\r\n--" + boundary + "--\r\n", "utf8"),
]);
var options = {
method: 'post',
url: url,
headers: {"Content-Type": "multipart/form-data; boundary=" + boundary},
body: payload,
};
request(options, function(error, response, body) {
console.log(body);
});
});
希望對其他人有幫助!
不推薦使用request
模塊,請考慮使用form-data
和核心http(s)
模塊。
它有點冗長,但你會得到更小的生產構建,這總是好的,在無服務器環境中更是如此,因為它可以減少冷啟動時間。
// abstract and promisify actual network request
async function makeRequest(formData, options) {
return new Promise((resolve, reject) => {
const req = formData.submit(options, (err, res) => {
if (err) {
return reject(new Error(err.message))
}
if (res.statusCode < 200 || res.statusCode > 299) {
return reject(new Error(`HTTP status code ${res.statusCode}`))
}
const body = []
res.on('data', (chunk) => body.push(chunk))
res.on('end', () => {
const resString = Buffer.concat(body).toString()
resolve(resString)
})
})
})
}
const formData = new FormData()
formData.append('comment', 'Some note attached to the submitted file')
formData.append('image', fs.createReadStream('./images/logo.png'))
const options = {
host: 'postman-echo.com',
path: '/post',
method: 'POST',
protocol: 'https:', // note : in the end
headers: {
Authorization: `Basic some-token-here`,
},
}
const res = await makeRequest(formData, options)
我想在沒有外部依賴的打字稿中構建一個工作示例。 我仍然會推薦上面的解決方案,但認為這可能對其他人有幫助。 這里唯一的外部依賴是用於設置內容類型標頭的mime-types ,但如果您知道提前上傳的內容類型,則可以將其刪除,從而使解決方案完全沒有依賴性。
執行:
/* eslint-disable prefer-template */
import http from 'http';
import fs from 'fs';
import mime from 'mime-types';
interface FileObject extends Record<string, string> {
fileName: string,
}
const buildFormInputFields = (fileObj: FileObject) => Object.entries(fileObj).map(
([key, value], index) => {
const pairStr = `name="${key}"; ${key}="${value}"`;
return index === Object.keys(fileObj).length - 1 ? pairStr : `${pairStr};`;
},
).join(' ');
const createFileRequest = (
fileObj: FileObject,
data: Buffer,
boundary: string,
) => {
const inputFields = buildFormInputFields(fileObj);
const { fileName } = fileObj;
const mimeType = mime.lookup(fileName);
if (!mimeType) throw new Error(`invalid mime type for file ${fileName}`);
const header = (
`--${boundary}\r\n`
+ `Content-Disposition: form-data; ${inputFields}`
+ '\r\n'
+ `Content-Type: ${mime.lookup(fileObj.fileName)}`
+ '\r\n\r\n'
);
return Buffer.concat([
Buffer.from(header, 'utf-8'),
data,
Buffer.from('\r\n', 'utf-8'),
]);
};
const buildRequestOptions = (boundary: string, length: number) => (
{
// your host here
host: 'localhost',
// your port here
port: 8088,
// your endpoint here
path: '/api/v1/files',
method: 'POST',
headers: {
'Content-Type': `multipart/form-data; boundary=${boundary}`,
'Content-Length': length,
Accept: '*/*',
},
}
);
const sendFileUploadRequest = (files: FileObject[], boundary: string) => new Promise(
(resolve, reject) => {
const fileBodies = files.map((fileObj) => {
const { fileName } = fileObj;
const data = fs.readFileSync(`${__dirname}/${fileName}`);
return createFileRequest(fileObj, data, boundary);
});
const footer = `--${boundary}--`;
const body = Buffer.concat([
...fileBodies,
Buffer.from(footer, 'utf-8'),
]);
const options = buildRequestOptions(boundary, body.length);
const req = http.request(options, (res) => {
console.log(`status: ${res.statusCode}`);
res.on('data', (chunk) => {
console.log(`BODY: ${chunk}`);
});
res.on('end', () => {
console.log('No more data in response.');
resolve(null);
});
});
req.on('error', (e) => {
reject(e);
console.error(`problem with request: ${e.message}`);
});
req.write(body);
req.end();
},
);
使用這個的示例腳本:
(async () => {
const files: FileObject[] = [
{
fileName: 'test1.txt',
foo: 'bar',
},
{
fileName: 'test2.txt',
foo: 'bar',
},
];
const boundary = '----FOOBAR';
await sendFileUploadRequest(files, boundary);
})();
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