How to send HTTP request with authorization header C?

To send an HTTP request with an authorization header in C, you can use the 'curl' library. Here's an example of how you can do this using the 'curl_easy_setopt' function to set the 'CURLOPT_USERPWD' option and the 'CURLOPT_HTTPHEADER' option:

#include <stdio.h> #include <curl/curl.h> int main(void) { CURL *curl; CURLcode res; curl = curl_easy_init(); if(curl) { // Set the URL to send the request to curl_easy_setopt(curl, CURLOPT_URL, "http://example.com"); // Set the username and password for basic authentication curl_easy_setopt(curl, CURLOPT_USERPWD, "username:password"); // Set a custom header with the authorization field struct curl_slist *headers = NULL; headers = curl_slist_append(headers, "Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ="); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); // Perform the request res = curl_easy_perform(curl); // Clean up curl_slist_free_all(headers); curl_easy_cleanup(curl); } return 0; }

This example uses basic authentication, but you can also use other types of authorization by setting the 'Authorization' header field to the appropriate value. For example, to use Bearer 'authentication', you can set the Authorization header field to 'Bearer <token>'.

You will need to install the 'curl' library and add the appropriate include paths and libraries to your project in order to use the 'curl' functions in your code.