Make an HTTP request with method GET to the URL u, then store the body of the response in the string s.
New implementation

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating material.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
(def s (slurp u))
using System.Net.Http;
var client = new HttpClient();
s = await client.GetStringAsync(u);
import std.net.curl;
import std.conv;
string s = u.get.to!string;
import "io"
import "net/http"
res, err := http.Get(u)
if err != nil {
	return err
buffer, err := io.ReadAll(res.Body)
if err != nil {
	return err
s := string(buffer)
String s = u.text
<script src="https://code.jquery.com/jquery-1.11.3.js"></script>
$.get(u, function(data){
  s = data;
  .then(res => res.text())
  .then(text => s = text)
var xmlHttp = new XMLHttpRequest();
xmlHttp.onreadystatechange = function() { 
	if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
		s = xmlHttp.responseText;
xmlHttp.open("GET", u, true);
const res = await fetch(u)
s = await res.text()
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
String s = HttpClient.newHttpClient().send(HttpRequest.newBuilder()
                .build(), HttpResponse.BodyHandlers.ofString())
(ql:quickload 'dexador)
(defvar *s* (string (dex:get u)))
$s = file_get_contents($u);
uses fphttpclient;
with TFPHTTPClient.Create(nil) do try
  s := get(u);
use HTTP::Tiny qw();
my $s = HTTP::Tiny->new->get($u)->{content};
import requests
s = requests.get(u).content.decode()
import urllib.request
with urllib.request.urlopen(u) as f:
    s = f.read()
require 'net/http'
u = URI("http://example.com/index.html")
s = Net::HTTP.get_response(u).body
error-chain = "0.12.4"
reqwest = { version = "0.11.2", features = ["blocking"] }

use error_chain::error_chain;
use std::io::Read;
let mut response = reqwest::blocking::get(u)?;
let mut s = String::new();
response.read_to_string(&mut s)?;
ureq = "1.0"
let s = ureq::get(u).call().into_string()?;
extern crate reqwest;
use reqwest::Client;
let client = Client::new();
let s = client.get(u).send().and_then(|res| res.text())?;
val s = scala.io.Source.fromURL(u).getLines().mkString("\n")