As a senior engineer with a background in algo trading in C++ and R programming in statistics, you may find yourself frequently needing to interact with REST APIs to retrieve data and perform various actions. HTTP is the standard protocol used for communication between clients and servers in REST API interactions. In this section, we will explore how to make HTTP requests to interact with REST APIs.

1#include <iostream>
2#include <cpprest/http_client.h>
3
4using namespace std;
5using namespace web::http;
6using namespace web::http::client;
7
8int main() {
9  // Create an HTTP client
10  http_client client(U("https://api.example.com"));
11
12  // Make a GET request
13  client.request(methods::GET, U("/api/resource")).then([](http_response response) {
14    // Process the response
15    if (response.status_code() == status_codes::OK) {
16      // Successful response
17      cout << "GET request successful!" << endl;
18    } else {
19      // Failed response
20      cout << "GET request failed!" << endl;
21    }
22  }).wait();
23
24  return 0;
25}

In the code snippet above, we use the C++ cpprest library to make an HTTP GET request to a fictional API endpoint /api/resource. The http_client object is used to create an HTTP client to communicate with the API. The client.request function is used to make the request, specifying the HTTP method (GET) and the resource URL (/api/resource). The request is made asynchronously using the then function, and a callback function is provided to handle the response. Inside the callback function, we check the status code of the response to determine if the request was successful or not.

Making HTTP requests is a fundamental skill in working with REST APIs. Understanding how to construct requests and handle responses is essential for building robust and efficient API integrations in your projects.

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#include <iostream>

#include <cpprest/http_client.h>

​

using namespace std;

using namespace web::http;

using namespace web::http::client;

​

int main() {

 // Create an HTTP client

 http_client client(U("https://api.example.com"));

​

 // Make a GET request

 client.request(methods::GET, U("/api/resource")).then([](http_response response) {

    // Process the response

    if (response.status_code() == status_codes::OK) {

        // Successful response

        cout << "GET request successful!" << endl;

    } else {

        // Failed response

        cout << "GET request failed!" << endl;

    }

 }).wait();

​

  return 0;

}