I am creating a system that passes http request to a child process in Node js. I cant pass the child process the active Socket using child.send( 'socket', req.socket ) but inside the child I want to recreate the http request and response objects so that they have the headers, parameters, cookies etc.
I am using Express, so if I can recreate the Express req and res object it's even better.
I have been fiddling a bit, but no success.
If I do the following it creates the IncomingMessage object but the headers etc are empty.
var http = require('http');
/* Child Process recieves the Socket */
var incomingMessage = new http.IncomingMessage( socket );
Any ideas if there is any way to accomplish what I want?
You can also this trick for tunneling:
let agent;
if (protocol == 'https:')
agent = new https.Agent();
else
agent = new http.Agent();
agent.createConnection = (opts, callback) => callback(false, socket);
const req = http.request({
method: method,
host: host,
port: port,
protocol: protocol,
path: path,
headers: headers,
agent: agent
}, function (res)
{
console.log(res.headers);
console.log(res.socket.remoteAddress);
console.log(res.socket == socket); // true
});
req.end();
Related
I made a node server with the three packages express, body-parser and cors.
I am trying to access data from client-side in my app.js with an async/await function that has a post request with the required data that I want to fetch
here's the fetch request and the post request in app.js, I am trying to pass the data [temperature, date, userResponse] via the postData function in app.js:
//post routes
const postData=async function postData(url = 'http://api.openweathermap.org/data/2.5/weather?zip=', data = {}) {
const response = await fetch(url, {
method: 'POST',
mode: 'cors',
cache: 'no-cache',
credentials: 'same-origin',
headers: {
'Content-Type': 'application/json'
},
redirect: 'follow',
referrerPolicy: 'no-referrer',
body: JSON.stringify(data)
});
return await response.json();
}
postData('/add', {temperature: '1', date: '2', userResponse: '2'});
}
and here's the server side code where I made an add route as post route:
// Setup empty JS object to act as endpoint for all routes
projectData = {};
// Require Express to run server and routes
const express = require('express');
// Start up an instance of app
const app = express();
/* Middleware*/
//Here we are configuring express to use body-parser as middle-ware.
const bodyParser = require('body-parser')
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
// Cors for cross origin allowance
const cors = require('cors');
app.use(cors());
// Initialize the main project folder
app.use(express.static('website'));
const port = 3000;
// Setup Server
const server=app.listen(port, ()=>{console.log(`running on localhost: ${port}`)});
app.get('/all', sendData);
function sendData (request, response) {
response.send(projectData);
};
// TODO-ROUTES!
const data=[]
app.post('/add', function(req,res){
data.push(req.body)
console.log(data)
})
here's what I got when I ran the project on localhost:3000
I want the the parameters temperature, date and userResponse to appear in the console
the errors at line 35 related to the post request are :
app.js:35 POST http://localhost:3000/add net::ERR_EMPTY_RESPONSE
app.js:48 Uncaught (in promise) TypeError: Failed to fetch
never mind the errors at the two above lines related to the get request
in vs code I can see this(the temperature, date and userResponse appear in the terminal but don't appear in the localhost:3000 console in the browser):
I just need the client-side to pass data to server-side dynamically and not just pass the response in the server-side
You are not sending any response back from the server. Send some response as below
app.post('/add', function(req,res){
data.push(req.body)
console.log(data)
return res.send({}); //return whatever response you need to send
})
I currently use request to make http requests in node.js. I had at some point encountered an issue where I was getting errors that indicated UNABLE_TO_GET_ISSUER_CERT_LOCALLY. To get around that it set rejectUnauthorized. My working code with request looks like this:
var url = 'someurl';
var options = {
url: url,
port: 443,
// proxy: process.env.HTTPS_PROXY, -- no need to do this as request honors env vars
headers: {
'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko',
'Accept-Language': 'en-us',
'Content-Language': 'en-us'
},
timeout: 0,
encoding: null,
rejectUnauthorized: false // added this to prevent the UNABLE_TO_GET_ISSUER_CERT_LOCALLY error
};
request(options, function (err, resp, body) {
if (err) reject(err);
else resolve(body.toString());
});
I thought I would try switching to the fetch api using async/await and am now trying to use node-fetch to do the same thing. However, when I do the same thing I am back to the UNABLE_TO_GET_ISSUER_CERT_LOCALLY errors. I read that I needed to use a proxy agent and tried using the proxy-agent module but I am still not having any luck.
Based off of the post https://github.com/TooTallNate/node-https-proxy-agent/issues/11 I thought the following would work:
var options = {
headers: {
'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko',
'Accept-Language': 'en-us',
'Content-Language': 'en-us'
},
timeout: 0,
encoding: null
};
var proxyOptions = nodeurl.parse(process.env.HTTPS_PROXY);
proxyOptions.rejectUnauthorized = false;
options.agent = new ProxyAgent(proxyOptions);
const resp = await fetch('someurl', options);
return await resp.text();
but I still get the same error. So far the only way I've been able to get around this using node-fetch is to set NODE_TLS_REJECT_UNAUTHORIZED=0 in my environment which I don't really want to do. Can someone help show me how to get rejectUnauthorized to work with node-fetch (presumably using an agent but I don't honestly care how as long as it's specified as part of the request).
This is how I got this to work using rejectUnauthorized and the Fetch API in a Node.js app.
Keep in mind that using rejectUnauthorized is dangerous as it opens you up to potential security risks, as it circumvents a problematic certificate.
const fetch = require("node-fetch");
const https = require('https');
const httpsAgent = new https.Agent({
rejectUnauthorized: false,
});
async function getData() {
const resp = await fetch(
"https://myexampleapi.com/endpoint",
{
agent: httpsAgent,
},
)
const data = await resp.json()
return data
}
Use proxy
You should know that node-https-proxy-agent latest version have a problem and doesn't work with Fetch! You can use older version 3.x and down! And it will work! Otherwise Better you can use the node-tunnel module https://www.npmjs.com/package/tunnel! You can too use the wrapping module proxy-http-agent that is based on node-tunnel https://www.npmjs.com/package/proxy-http-agent! That provide automatic detection of protocol for the proxy! One method for all! And more options and affinity! And both of them support both http and https !
You can see the usage and see a good example of proxy building and setup in this module and repo (check the tests):
https://www.npmjs.com/package/net-proxy
https://github.com/Glitnirian/node-net-proxy#readme
ex:
import { ProxyServer } from 'net-proxy';
import { getProxyHttpAgent } from 'proxy-http-agent';
// ...
// __________ setting the proxy
const proxy = new ProxyServer({
port: proxyPort
});
proxy.server.on('data', (data: any) => { // accessing the server instance
console.log(data);
});
await proxy.awaitStartedListening(); // await server to start
// After server started
// ______________ making the call through the proxy to a server through http:
let proxyUrl = `http://localhost:${proxyPort}`; // Protocol from the proxy is automatically detected
let agent = getProxyHttpAgent({
proxy: proxyUrl,
endServerProtocol: 'http:' // the end server protocol (http://localhost:${localApiServerPort} for example)
});
const response = await fetch(`http://localhost:${localApiServerPort}`, {
method: 'GET',
agent
});
// ___________________ making a call through the proxy to a server through https:
agent = getProxyHttpAgent({
proxy: proxyUrl, // proxy as url string! We can use an object (as tunnel module require too)
rejectUnauthorized: false // <==== here it go
});
const response2 = await fetch(`https://localhost:${localApiHttpsServerPort}`, {
method: 'GET',
agent
});
You can see more examples and details in the doc here:
https://www.npmjs.com/package/proxy-http-agent
And you can too use directly node-tunnel! But the package is just a simple wrapper! That make it more simpler!
Add rejectUnauthorized
For the one that doesn't know well!
As per this thread
https://github.com/node-fetch/node-fetch/issues/15
We use the https.Agent to pass the rejectUnauthorized parameter!
const agent = new https.Agent({
key: fs.readFileSync(`${CERT_PATH}.key`),
cert: fs.readFileSync(`${CERT_PATH}.crt`),
rejectUnauthorized: false
})
A complete example
import https from "https";
const agent = new https.Agent({
rejectUnauthorized: false
});
fetch(myUrl, { agent });
For fetch you can too use an environment variable as follow
process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0";
This way it gonna be set globaly and not per each call! Which may be more appropriate if you are using a constant proxy! For all calls! As when sitting behind the company proxy!
why
By default node fetch! And most of the http requests clients! All use the security and insure a valid ssl Certificate when using https!
To disable this behavior we need to disable that check somehow!
Depending on the libs it may be different!
For fetch that's how it's done!
With http.request! (underlying)
const https = require('https');
const options = {
hostname: 'encrypted.google.com',
port: 443,
path: '/',
method: 'GET',
rejectUnauthorized: false /// <<<== here
};
const req = https.request(options, (res) => {
console.log('statusCode:', res.statusCode);
console.log('headers:', res.headers);
res.on('data', (d) => {
process.stdout.write(d);
});
});
req.on('error', (e) => {
console.error(e);
});
req.end();
check this:
https://nodejs.org/api/https.html#https_https_request_url_options_callback
Also it's part of tls.connect Options
Which you can check here
https://nodejs.org/api/tls.html#tls_tls_connect_options_callback
I'm trying to use http.Agent({ keepAlive: true}) on http.request to keep the connection open for future requests.
I created a simple server to log each new connection but when i run my request.js the server logs two new connections.
How can i use the HTTP keep-alive with Node.js native modules?
request.js:
const http = require("http");
const agent = new http.Agent({
keepAlive: true
});
var req1 = http.request({
agent: agent,
method: "GET",
hostname: "localhost",
port: 3000
}, function (res1) {
console.log("REQUEST_1");
var req2 = http.request({
agent: agent,
method: "GET",
hostname: "localhost",
port: 3000
}, function (res2) {
console.log("REQUEST_2");
});
req2.end();
});
req1.end();
server.js:
const http = require('http');
var server = http.createServer(function (req, res) {
res.end('OK');
console.log("REQUEST");
})
server.on('connection', function (socket) {
console.log("NEW CONNECTION");
})
server.listen(3000);
output:
NEW CONNECTION
REQUEST
NEW CONNECTION
REQUEST
Set maxSockets options like this:
const agent = new http.Agent({
keepAlive: true,
maxSockets: 1
});
By default maxSockets is set to Infinity - https://nodejs.org/api/http.html#http_new_agent_options
Full example on node v10
const http = require("http");
const agent = new http.Agent({
keepAlive: true,
maxSockets: 1
});
var req1 = http.request({
agent: agent,
method: "GET",
hostname: "localhost",
port: 3000
}, function (res1) {
console.log("REQUEST_1");
res1.on('data', function () {
console.log("REQUEST_1 data");
});
res1.on('end', function () {
console.log("REQUEST_1 end");
});
var req2 = http.request({
agent: agent,
method: "GET",
hostname: "localhost",
port: 3000
}, function (res2) {
console.log("REQUEST_2");
res2.on('data', function () {
console.log("REQUEST_2 data");
});
res2.on('end', function () {
console.log("REQUEST_2 end");
});
});
req2.end();
});
req1.end();
The accepted answer doesn't make clear that the code posted will allow only one request simultaneously per host per thread.
That is usually not what you want and will lead to requests slowing down waiting for the previous one to complete.
Starting with Node.js v19, the keepAlive option is set to true by default for all outgoing HTTP(s) connections.
You can read more about it on Node.js's v19 documentation.
your demo not set res1's on data listener ,it will cause the socket not be close ,so the second request have to create a new connect to server ,just add a data listener
I am trying to send a post request to a service from my node server.
Node is running on http://localhost:3000. The method I am trying to reach is reachable through http://localhost:80/some/adress/business/layer/myMethod.
var options = {
host: 'localhost',
path: '/some/adress/business/layer/myMethod',
port: '80',
method: 'POST',
headers: {
'Content-type': 'application/json',
'Content-Length': data.length
}
};
var req = http.request(options, function (resu) {
console.log('statusCode: ' + res.statusCode)
resu.on('data', function (d) {
console.log(d);
});
resu.on('error', function (err) {
console.log(err);
});
resu.on('end', function () {
res.jsonp({ result: true });
res.end();
});
});
req.write("data");
req.end();
The request works fine, well more or less. I am getting a 401 status back. The question is: How can I send windows credentials from node to the named server running on localhost:80... ?
Without knowing the exact details of your setup, I can't be sure, but you probably need to use NTLM authentication. There are several libraries that do this for node. Take a look at this question. Hope this helps!
I want to make GET request to scrape some data thru a proxy server that is randomly generated using the gimmeproxy.com free API.
I am able to get the proxy ip/port and am using
'https-proxy-agent' to setup the agent with the proxy data.
Whenever I try to call any website I always get
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>405 Method Not Allowed</title>
</head><body>
<h1>Method Not Allowed</h1>
<p>The requested method CONNECT is not allowed for the URL
/index.html.en.backup.</p>
</body></html>
Here is my node script:
const request = require('request'), HttpsProxyAgent = require('https-proxy-agent');
generateRandomProxy(function(proxy){
var agent = new HttpsProxyAgent({
proxyHost: proxy.proxyHost,
proxyPort: proxy.proxyPort
});
request({
uri: "http://example.com",
method: "GET",
agent: agent,
timeout: 5000,
}, function(error, response, body) {
console.log(body);
});
})
function generateRandomProxy(cb){
request.get(' https://gimmeproxy.com/api/getProxy?get=true&cookies=true&country=US',{json:true},function(err,res){
if(!err){cb({
proxyHost: res.body.ip,
proxyPort: res.body.port
})}
else{console.log('problem obtaining proxy')}
})
}
So my question: How can I route my request thru the proxy and then get a returned body that is valid?
As you see now I keep getting the 405 Method Not Allowed
Thank you for any assistance.
Edit: Just found some GimmeProxy wrapper for Node.js: gimmeproxy-request.
It claims to automatically re-route requests through another proxy when one fails.
With this module code would look like this:
const setup = require('gimmeproxy-request').setup;
const request = require('gimmeproxy-request').request;
setup({
api_key: 'your api key',
query: 'get=true&cookies=true&country=US&supportsHttps=true&maxCheckPeriod=1800&minSpeed=10', // additional gimmeproxy query parameters
retries: 5, // max retries before fail
test: (body, response) => body.indexOf('captcha') === -1 && response.statusCode === 200 // test function
});
request('https://example.com', {
timeout: 10000 // additional request parameters, see https://github.com/request/request
},
function(err, res, body) {
console.log('err', err)
console.log('res', res)
console.log('body', body)
process.exit()
});
I guess the issue is that you sometimes get not an https proxy from Gimmeproxy, while 'https-proxy-agent' expects https proxy only.
To fix it, use the proxy-agent package of the same author and pass curl field of GimmeProxy response. It will select correct proxy agent implementation.
The following code works for me:
const request = require('request'), ProxyAgent = require('proxy-agent');
generateRandomProxy(function(proxy){
console.log(proxy);
var agent = new ProxyAgent(proxy.curl);
request({
uri: "https://example.com",
method: "GET",
agent: agent,
timeout: 5000,
}, function(error, response, body) {
console.log(error);
console.log(body);
});
})
function generateRandomProxy(cb){
request.get('https://gimmeproxy.com/api/getProxy?get=true&cookies=true&country=US&supportsHttps=true&maxCheckPeriod=1800&minSpeed=10',{json:true},function(err,res){
if(!err){cb(res.body)}
else{console.log('problem obtaining proxy')}
})
}
Note: If you want to call https websites, you should query for proxies with https support using supportsHttps=true parameter. Also it makes sense to query for fresh proxies with maxCheckPeriod=1800 parameter. Setting minSpeed=10 also helps:
https://gimmeproxy.com/api/getProxy?get=true&cookies=true&country=US&supportsHttps=true&maxCheckPeriod=1800&minSpeed=10