The res.body in node-fetch is a readable stream, so decoding can be handled independently, which is very convenient. To install Axios from npm, enter the following command in your terminal: npm install axios@0.19.2. Synchronous Requests in Node.js Written by Mikeal Rogers, request allows you to make all types of HTTP requests, including GET, POST, PUT, and . Step 1: Build Project Folder. Tags: nodejs request 9 Answers Answer by Ayla Guerra So now in order to adjust the code, we will need to create a separate async function in which we will wait for the HTTP request to be made and full response to come.,Consider sending a normal GET request. We interact with Axios using Promises, or the async/await keywords which are an alternative syntax for using Promises. On synchronous operations in Node.js. The HTTPRequest node interacts with a web service, using all or part of the input message as the request that is sent to that service. The output of this command is shown below: "Hello aditya", "post" and . Most Web framework use the same approach to serve an HTTP request, that can be modeled as a different thread being used for each request. Asynchronous programming in Node.js. await allows us to wait for the response of an asynchronous request. The asynchronous request nodes return control to the flow without waiting for a response. There are many HTTP libraries available for Node.js developers, each of which is intended to ease the management of HTTP requests. Fixing DNS in Node.js | HTTP Toolkit Node.js Tutorial => Callback functions A Computer Science portal for geeks. js file for main entry point of nodejs application and HTTP request to upload image into folder and store image name into . 5 Ways to Make HTTP Requests in Node.js using Async/Await Close Products Voice & Video Programmable Voice Programmable Video Elastic SIP Trunking TaskRouter Network Traversal Messaging Programmable SMS Programmable Chat Notify Authentication Authy Connectivity Lookup Phone Numbers Programmable Wireless Sync Marketplace Add‑ons Platform Asynchronous Iterative & Recursive Patterns for Node.js - Part 2 To install it, we run npm i sync-request Then we use it by writing The SOAPAsyncRequest node waits for the HTTP 202 acknowledgment before continuing with the message flow, and the SOAPAsyncRequest node blocks if the acknowledgment is not received. JavaScript evolved in a very short time from callbacks to promises (ES2015), and since ES2017 asynchronous JavaScript is even simpler with the async/await syntax. This is a terrible idea. 5 Ways to Make HTTP Requests in Node.js using Async/Await - Twilio Blog How to make an API request in Node.js? - mariokandut.com Node.js itself cannot resolve a Promise synchronously. (The red bars show when the process is waiting for an external resource's response and is blocked, the black bars show when your code is running, the green bars show the rest of the application). sync-request - npm synchronous https request Making HTTP requests with Node.js To make synchronous requests in Node.js, we can use the sync-request package. This makes the single threaded Javascript run with efficiency. Understanding HTTP Requests in Node.js - Section GitHub - ForbesLindesay/sync-request: Make synchronous web requests ... The Node.js Request Module - Stack Abuse Basic Node.js Lambda Function Concepts | by Thomas Hunter II ... - Medium // The synchronous call to QuickGetObj would return an HTTP response object. Synchronous HTTP requests are possible in Node.js with the use of Javascript Promises, async and await. Axios. A Node.js process will also not exit until any pending Promises are resolved. There are two simple ways for making HTTP requests with Node.js: with a library which follows the classic callback pattern, or even better with a library which supports Promises. The problem is, B is an asynchronous service/API: Anything N POSTs to B is responded to first with an HTTP 202 ("request accepted"), and then later with the actual data as a . Contribute to MohIrsadDeveloper/Node-Interview-Question development by creating an account on GitHub. In a node.js application you will find that you are completely unable to scale your server. N.B. Fixing DNS in Node.js | HTTP Toolkit On successful transmission, the data is posted to the server. Lines of code are executed in series, one after another, for example: JS. Asynchronous calls return the result later in a callback, making the code more convoluted. Waiting for whatever, had it been possible, would essentially cause a deadlock. Explore Node.js basic concepts - IBM Developer The authorization flow in this example is designed for a command line application. Event Loops in NodeJS - Beginner's Guide to Synchronous and ... Axios. Node.js 如何使请求同步等待同一NodeJS/express webservice的另一个请求?,node.js,express,request,wait,synchronous,Node.js,Express,Request,Wait,Synchronous The HTTPAsyncRequest node always uses asynchronous HTTP socket handling to make asynchronous requests and responses. Contributor To understand Promises it is important to understand the difference between synchronous and asynchronous code first. This example demonstrates how to obtain the HTTP response object for such a method when calling asynchronously. Node.js 如何使请求同步等待同一NodeJS/express webservice的另一个请求?_Node.js_Express ... Blocking and Non-Blocking in Node.js - AfterAcademy Using client side rendering in your Node. Note: As of this writing, asynchronous programming is no longer done using only callbacks, but learning this obsolete method can provide great context as to why the JavaScript community now uses promises. The asynchronous coding paradigm enables us to write non-blocking code. Avoid synchronous code and queue long running processes. Node.js Tutorial => http client It was a mistake in the browser, and it's a mistake on the server. Synchronous HTTP request in node.js - Stack Overflow Axios is another Promise based HTTP client that works for the browser as well as node.js. Below is how you can make an HTTP request to httpbin.org using Node's http module: const http = require ('http'); // `res` is an instance of Node's built-in `ServerResponse` class: . Synchronous HTTP requests in Node.js - Stack Overflow server.close([callback]) See http.close() for details. Latest Node.js Tutorials and How-To's - Page 1 - UsefulAngle Synchronous requests block the execution of code which causes "freezing" on the screen and an unresponsive user experience. Using HTTP asynchronous request-response See http.listen() for details. synchronous request node js files. You should not be using this in a production application. Modern Asynchronous JavaScript with Async and Await Creating a Node.js Library that Supports Both Promises and Error-First Callbacks; Creating API's with Node.js; csv parser in node js; Database (MongoDB with Mongoose) Debugging Node.js application; Deliver HTML or any other sort of file; Dependency Injection; Deploying Node.js application without downtime. So let's for now imagine that next to node's asynchronous http.get method, there's a synchronous version called http.getSync that takes the request url and returns the response body as a string. Using HTTP asynchronous request-response - IBM Tejan Singh. . You can also configure the node to create an output message from the contents of the input message, augmented by the contents of the web service response, before you propagate the message to subsequent nodes in the message flow. May 14, 2019. nodejs. Some HTTP methods return an HTTP response object. In a node.js application you will find that you are completely unable to scale your server. Https - node - Read the Docs NodeJS is an asynchronous event-driven JavaScript runtime environment designed to build scalable network applications. Node.js 中的同步 HTTP 请求 2018-10-31 http - on -modify- request 触发时 的 同 步 请 求 2014-11-12 Node.js 和 Express:在响应 HTTP 请 求 之前 等 待 异 步 操作 2019-09-30 This tutorial assumes you know a bit if these, but if not you can refer to these resources for understanding them : Javascript Promises Async functions Await operator Using Javascript Promises to Make HTTP Request So how do I make JavaScript synchronous so that it completes this process first and then do interpret further code. Because of these rough edges in the API, most developers don't use Node.js' HTTP library for making requests. Critically, this is something that most modern applications do a lot, every time you make an HTTP request or any other network request to a machine, . Node Fetch API Send HTTP Request with Async Await Tutorial Critically, this is something that most modern applications do a lot, every time you make an HTTP request or any other network request to a machine, . The code is a lot more simple if you use synchronous calls because they return the result right there. Step 3: Make Server File. Tejan Singh. Finding long synchronous operations in Node.js with Async Hooks Synchronous and asynchronous requests XMLHttpRequest supports both synchronous and asynchronous communications. This tutorial discusses how to send a HTTP POST request from Node using the http module. Event Loops in NodeJS - Beginner's Guide to Synchronous and ... const {forceSync } = require ('node-force-sync') . Make synchronous web requests with cross-platform support. Synchronous-style HTTP requests are possible in Node with the use of Javascript Promises, along with the concepts of async and await. You should not be using this in a production application. We recommend using Axios instead. How to get HTTP headers with Node.js? - The Web Dev A synchronous history of JavaScript & Node.js async/await. Finding long synchronous operations in Node.js with Async Hooks A new HTTP connection is made by the backend server to reply to the SOAPAsyncResponse node. (__dirname + '/public/index. Nodejs API best practices - Strapengine Synchronous HTTP Request. You just have to stick to these rules to keep things smooth: As a rule of thumb, prefer async, because using a non-blocking approach gives superior performance over the synchronous scenario, and the async - await keywords gives you more flexibility in structuring . NodeJS: synchronous vs. asynchronous. I'd like to set the record straight regarding this: NodeJS does support Synchronous Requests. So callbacks are not directly called by the code that scheduled them . In general, however, asynchronous requests should be preferred to synchronous requests for performance reasons. The following figure . How to make synchronous requests in Node.js? If the call one function inside of the other, which between four network hops removed. Blocking could be in some rare cases considered . How To Write Asynchronous Code in Node.js - DigitalOcean Node.js — How to Run an Asynchronous Function in Array.map() Node.js Async Await Tutorial - With Asynchronous JavaScript Examples In this article, you will learn and understand how NodeJS works and handles all . Understanding HTTP Requests in Node.js - Section One great feature of the request is that it provides a single module that can make both http and https requests. This tutorial will show you a couple of ways to make simple network requests with Nod. Create a directory and call it /filepond. Ive got a following piece of codevar page 2var last_page 100whilepage lt last_page requesthttpsome_json_servercomdatapage page func. Callbacks are added to event queue and processed after thread returns from outer scope. We'll look at how Node.js . Retrying Failed HTTP Requests with RxJS retry() & HttpClient.. guardsman: Wrap NodeJS request module to retry http requests in case of errors - FGRibreau/node-request-retry.. Apr 25, 2017 — For every request that I was making to the Node.js server, I was seeing three errors show up in my console. 5 Ways to Make HTTP Requests in Node.js using Async/Await - Twilio Blog Under most situation, we should use the asynchronous functions to get the advantages of Node.js. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. One of the last but not the least nodejs API best practices is avoiding synchronous code. Node.js https.request() Function - GeeksforGeeks Async functions are a combination of promises and generators, and basically, they are a higher level abstraction over promises. In Node.js, input and output activities like network requests are done asynchronously. You really can't. And that's a good thing. The following figure . Node.js Programming Model : Asynchronous, Callbacks - w3resource Requires at least node 8 N.B. Async functions are a combination of promises and generators, and basically, they are a higher level abstraction over promises. A Computer Science portal for geeks. A single thread is like an execution that can do only one thing at a time. File handling in Node.js - GeeksforGeeks Using HTTP asynchronous request-response. "Synchronous" fetch with async/await - DEV Community In this three-part-series we'll look at getting a Node.js application which performs image resizing running on AWS Lambda. A large number of NodeJS's I/O functions come in two flavors: synchronous and asynchronous. If options is a string, it is automatically parsed with url.parse(). . } In the name cURL, c stands for Client and URL indicates curl works with URL's. In this article we will deal only with making HTTP requests from Curl. There are situations where you want to run asynchronous functions within map, e.g. The node therefore uses asynchronous HTTP socket handling instead of WS-Addressing to make HTTP requests and receive an asynchronous response. Writing Asynchronous Requests With Axios. Node-Interview-Question/nodejs-api.md at master - github.com Next, we use http.request to send the data to the server and await the response. Here are some of the more common options you'll encounter in your applications: url: The destination URL of the HTTP request; method: The HTTP method to be used (GET, POST, DELETE, etc); headers: An object of HTTP headers (key-value) to be set in the request; form: An object containing key-value form data In this article, you will learn and understand how NodeJS works and handles all . (Node.js) Getting the HTTP Response after an Asynchronous HTTP Request ... One great feature of the request is that it provides a single module that can make both http and https requests. Making an HTTP Request in Node.js - Mastering JS Node js express button click example - cosmoetica.it Making Asynchronous HTTP Requests in JavaScript with Axios - Stack Abuse Deploying Node.js applications in . What are happy with node before continuing to exist in node apis to synchronous request node js programmers. https.request(options, callback) Makes a request to a secure web server. The HTTP options specify the headers, destination address, and request method type. We'll look at how it's worked through time, from the original callback-driven implementation to the latest shiny async/await keywords. The first argument to request can either be a URL string, or an object of options. Some of the more commonly used libraries include: http fetch Axios node-fetch Got Code implementation http module The http module is available natively with Node.js; there is no additional installation required. http请求的最小node.js同步等待(minimal node.js synchronous wait on http request ... The B component is represented by the following Node.js snippet. Axios is a Promise based HTTP client. async/await allows us to program using asynchronous requests in a "synchronous" manner using the modern versions of Javascript. Spread the love Related Posts How to extract request HTTP headers from a request using Node.js Connect?Sometimes, we want to extract request HTTP headers from a request using Node.js Connect. So putting these two pieces together, you can "force synchronous . Now that you have good understanding of asynchronous execution and the inner-workings of the Node.js event loop, let's dive into async/await in JavaScript. In the above code I'm just making a get request to teamtreehouse API but the problem is that as JavaScript being Asynchronous the code after this runs first while the request is in process. Feature of https module: It is easy to get started and easy to use. Using HTTP asynchronous request-response Nodejs-request-retry The asynchronous code will be written in three ways: callbacks, promises, and with the async / await keywords. Most Web framework use the same approach to serve an HTTP request, that can be modeled as a different thread being used for each request. There is no such thing as synchronous requests/join/waitFor in Javascript because everything runs on the same thread, even callbacks. JavaScript evolved in a very short time from callbacks to promises (ES2015), and since ES2017 asynchronous JavaScript is even simpler with the async/await syntax. The http module can be used to make http requests and the https module can be used to make https requests. This is the default behavior. HTTP is by its nature async and streaming, which is why it. To resolve this issue, Node.js introduced an asynchronous programming model. To get this . PDF Node Js Request Synchronous - citycyclingclub.co.za In a client application you will find that sync-request causes the app to hang/freeze. Node.js provides two core modules for making http requests. HTTPRequest node - IBM The response is stored in the req variable, and upon error, it is logged into the console. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. How to make synchronous requests in Node.js? - The Web Dev This means that code cannot create new threads and run in parallel. JavaScript is synchronous by default and is single threaded. Node.js https.request() Function - GeeksforGeeks Making HTTP Requests in Node.js - SitePoint Deploying Node.js applications in . The downside is that it only supports res.text(), res.json(), res.blob(), res.arraybuffer(), and res.buffer().There is no caching built-in and no server-side cookie store, so Set-Cookie headers have to extracted manually.. 3. Asynchronous I/O is a form of input/output processing that permits other processing . The HTTPAsyncRequest node always uses asynchronous HTTP socket handling to make asynchronous requests and responses. Setting up the project. How to Handle HTTP Requests Asynchronously with Async / Await in Node Js. Asynchronous here refers to all those functions in JavaScript that are processed in the background without blocking any other request. Here is an example comparing synchronous and asynchronously model using file_system.readFile because: DNS requests in node appear asynchronous, but they're actually internally implemented as synchronous calls within node's internal libuv threadpool (which by default has only 4 threads . Node.js 如何使请求同步等待同一NodeJS/express webservice的另一个请求?_Node.js_Express ... Node.js http.ServerResponse.setTimeout() Method - GeeksforGeeks I'm writing a Nodejs based service, N, that sits between entities A and B. The node therefore uses asynchronous HTTP socket handling instead of WS-Addressing to make HTTP requests and receive an asynchronous response. Fortunately, Node.js eliminates the complexities of writing thread-safe code. No. I would prefer if Node.js had a simple, native synchronous version of https.request (url [, options] [, callback]). To start, create an empty folder and initialize the project: mkdir making-http-requests-node-js && cd $_ npm init -y. Modern Asynchronous JavaScript with Async and Await Asynchronous here refers to all those functions in JavaScript that are processed in the background without blocking any other request. How can I make this call to request in nodejs synchronous? There are a few solutions for synchronous requests on Stack Overflow: Synchronous request in Node.js (18 answers), but they all either provide external libraries, hacky solutions or overcomplicated code. The httpServerResponse.setTimeout is an inbuilt application programming interface of class ServerResponse within the HTTP module which is used to set the Socket's timeout value to msecs (Milliseconds).. Syntax: const response.setTimeout(msecs[, callback]) Parameters: This method takes the first parameter as socket time out value in a millisecond, and the second parameter is a callback . The following code will accomplish the same task of logging the URL and explaining the astronomy picture of the day: But unfortunately, node doesn't have a synchronous version for its http module (unlike the filesystem fs module we used in part 1). The curl project has a curl command line and a libcurl library. However, when we run the asynchronous code against lots of simultaneous requests, its . (Node.js) Getting the HTTP Response after an Asynchronous HTTP Request Completes. How to wait until a request is complete in node.js? - Treehouse In this tutorial, you'll learn how to make an HTTP request in Node.js. In order to make the POST call, type the post body to send. In a client application you will find that sync-request causes the app to hang/freeze. Synchronous and asynchronous requests - Web APIs | MDN - Mozilla A NodeJS Webserver - Beej The V8 JavaScript Engine Run Node.js scripts from the command line How to exit from a Node.js program How to read environment variables from Node.js How to use the Node.js REPL Node.js, accept arguments from the command line Output to the command line using Node.js Accept input from the command line in Node.js Expose functionality from a Node . 4 + 1 ways for making HTTP requests with Node.js: async/await edition How To Make an HTTP Request In Node.js Tutorial - YouTube because: DNS requests in node appear asynchronous, but they're actually internally implemented as synchronous calls within node's internal libuv threadpool (which by default has only 4 threads . Before you can start building Node.js apps, you need a strong understanding of Node basic concepts, including blocking and non-blocking programming, Node modules, and more . When A sends an HTTP request to B, B sends another HTTP request to C, retrieves the relative content and sends it back to A, as an HTTP response. Step 4: Configure Fetch API in Node. Node.js https.request () Function. NodeJS - making the while loop synchronous - SemicolonWorld It wasn't designed to support them out of the box, but there are a few workarounds if you are keen enough, here is an example: As you may have already heard that nodejs is single-thread. In a single request, head-to-head comparison, synchronous wins with pure speed. The asynchronous request nodes return control to the flow without waiting for a response. NodeJS is an asynchronous event-driven JavaScript runtime environment designed to build scalable network applications. In… How to pass JSON to HTTP POST request made with Node.js request?Sometimes, we want to pass JSON to HTTP POST request made with Node.js […] Step 6: Get Async and Await Response. That simply means that nodejs can only handle/process one task at a time. Node Hero - Understanding Async Programming in Node.js - RisingStack Creating a Node.js Library that Supports Both Promises and Error-First Callbacks; Creating API's with Node.js; csv parser in node js; Database (MongoDB with Mongoose) Debugging Node.js application; Deliver HTML or any other sort of file; Dependency Injection; Deploying Node.js application without downtime. Blocking and Non-Blocking in Node.js - Asynchronous Operations and Callbacks. Understanding Promises in Node.js js libraries. GitHub - tannerntannern/node-force-sync: Forces an async function to ... Node.js smartly uses this single thread to get non . In Node programming model almost everything is done asynchronously but many of the functions in Node.js core have both synchronous and asynchronous versions. : nodejs synchronous http request '' > Understanding Promises in Node.js with the use of Javascript &... Thing at a time Axios using Promises programming/company interview Questions used to make HTTP requests requests and the https can. Output activities like network requests are possible in Node.js more convoluted request nodes return to... That permits other processing the HTTP nodejs synchronous http request specify the headers, destination address, and request type... Obtain the HTTP response object for such a method when calling asynchronously permits other processing,... That can do only one thing at a time asynchronous Operations and callbacks the record straight regarding this nodejs... Request is complete in Node.js < /a > a synchronous history of Javascript t. and that #..., each of which is intended to ease the management of HTTP requests and the https:... Web Dev < /a > this means that code can not create new threads run. The response of an asynchronous request / await in node js programmers to... 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Even callbacks functions are a combination of Promises and generators, and request method type along with use... //Www.Ibm.Com/Docs/En/Ssmkhh_10.0.0/Com.Ibm.Etools.Mft.Doc/Bc19319_.Htm '' > how to make synchronous requests for performance reasons after thread returns from outer.. Us to program using asynchronous requests should be preferred to synchronous requests that sync-request causes the app to hang/freeze at! Articles, quizzes and practice/competitive programming/company interview Questions putting these two pieces together, you &! Are a combination of Promises and generators, and basically, they are a level. # x27 ; s I/O functions come in two flavors: synchronous and asynchronous versions really &! Make asynchronous requests should be preferred to synchronous request node js programmers following piece of page! Http request in Node.js handled independently, which is why it are possible in Node.js core both... And basically, they are a combination of Promises and generators, and request type. Point of nodejs application and HTTP request to a secure Web server Web server app to.... Is synchronous by default and is single threaded Javascript run with efficiency request node js programmers callbacks not... Url string, it is important to understand the difference between synchronous asynchronous... And a libcurl library order to make the POST call, type the POST body to send HTTP. Tutorial will show you a couple of ways to make https requests practices is avoiding synchronous code URL,! These two pieces together, you & # x27 ; s I/O functions come in flavors... Provides two core modules for making HTTP requests is single threaded and libcurl., nodejs synchronous http request of which is intended to ease the management of HTTP requests are done asynchronously node to! A string, it is automatically parsed with url.parse ( ) to Handle requests. Destination address, and basically nodejs synchronous http request they are a combination of Promises and,... Page 2var last_page 100whilepage lt last_page requesthttpsome_json_servercomdatapage page func lt last_page requesthttpsome_json_servercomdatapage page func for such a method when asynchronously... To install Axios @ 0.19.2, and basically, they are a of! Therefore uses asynchronous HTTP request Completes does support synchronous requests for performance reasons > js libraries function... Map, e.g calls because they return the result right there be to. Demonstrates how to make https requests of Javascript & amp ; Node.js async/await returns. Be a URL string, or an object of options simultaneous requests, its best is! Concepts of async and await synchronous requests/join/waitFor in Javascript that are processed in the background without blocking other! Two pieces together, you & # x27 ; t. and that & # x27 ; like... Introduced an asynchronous HTTP socket handling instead of WS-Addressing to make https.... Simple if you use synchronous calls because they return the result right there headers destination. A readable stream, so decoding can be used to make HTTP requests making the code is a,! Code that scheduled them is avoiding synchronous code, so decoding can handled. So putting these two pieces together, you can & quot ; manner using the HTTP response object such... Been possible, would essentially cause a deadlock number of nodejs & # x27 d... Feature of https module can be used to make https requests contains well,. In series, one after another, for example: js these two pieces together, you & x27. Node.Js developers, each of which is very convenient keywords which are an alternative syntax using! Node apis to synchronous requests such thing as synchronous requests/join/waitFor in Javascript because everything on...: //strapengine.com/nodejs-rest-api-best-practices/ '' > nodejs API best practices - Strapengine < /a > synchronous HTTP requests and receive an programming... By the code that scheduled them hops removed Promises are resolved in this tutorial, can... Node before continuing to exist in node js: js there is no such thing as synchronous requests/join/waitFor in because. Axios @ 0.19.2 outer scope such thing as synchronous requests/join/waitFor in Javascript because everything runs on the thread! Makes the single threaded Javascript run with efficiency those functions in Node.js contains well written, well thought well... Callback ) makes a request to upload image into folder and store image name into environment designed to scalable. Without waiting for whatever, had it been possible, would essentially cause a deadlock ''! Http is by its nature async and await directly called by the code a! All those functions in Javascript because everything runs on the same thread, even.! Curl command line and a libcurl library nodejs is an asynchronous response either be a URL string, an! Call one function inside of the functions in Node.js, input and output activities like network requests Nod. Requests are done asynchronously but many of the last but not the least nodejs API best -... > a synchronous history of Javascript hops removed fortunately, Node.js introduced an asynchronous programming model its... Http asynchronous request-response < /a > in this tutorial discusses how to Handle HTTP requests asynchronously with async await. In general, however, when we run the asynchronous request the HTTPAsyncRequest node always uses asynchronous HTTP handling! - asynchronous Operations and callbacks of nodejs & # x27 ; s I/O functions come two!, so decoding can be handled independently, which is intended to ease the management of HTTP requests nodejs and. Obtain the HTTP options specify the headers, destination address, and request method type are a level... Issue, Node.js eliminates the complexities of writing thread-safe code to Handle HTTP are! The first argument to request can either be a URL string, it is important to understand it! And store image name into many HTTP libraries available for Node.js developers, each of which is why.. Lots of simultaneous requests, its least nodejs API best practices - Strapengine < /a > Tejan Singh of... Node therefore uses asynchronous HTTP socket handling to make simple network requests are done asynchronously many... Understand the difference between synchronous and asynchronous you a couple of ways to make HTTP.... Runtime environment designed to build scalable network applications thread is like an execution that can do only one thing a.
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nodejs synchronous http request