making HTTPS request using cpp-httplib - c++

Question

I'm trying to send an HTTPS request in c++ using Cpp-httplib but I'm getting various errors and warnings building their example:
#include "stdafx.h"
#include <httplib.h>
#include <Windows.h>
#include <iostream>
#define CA_CERT_FILE "./ca-bundle.crt"
#define CPPHTTPLIB_OPENSSL_SUPPORT 1
using namespace std;
int main()
{
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
httplib::SSLClient cli("localhost", 8000);
//httplib::SSLClient cli("google.com");
// httplib::SSLClient cli("www.youtube.com");
cli.set_ca_cert_path(CA_CERT_FILE);
cli.enable_server_certificate_verification(true);
#else
httplib::Client cli("localhost", 8000);
#endif
char* x = { "hello world" };
httplib::Params params{
{ "key", x }
};
auto res = cli.Post("/postReq/", params);
if (res) {
cout << res->status << endl;
cout << res->get_header_value("Content-Type") << endl;
cout << res->body << endl;
}
else {
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
auto result = cli.get_openssl_verify_result();
if (result) {
cout << "error";
cout << "verify error: " << X509_verify_cert_error_string(result) << endl;
}
#endif
}
system("pause");
return 0;
}
This is the build output:
Call to 'std::basic_string::copy' with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators'
error C2039: 'SSLClient': is not a member of 'httplib'
error C2065: 'SSLClient': undeclared identifier
error C3861: 'X509_verify_cert_error_string': identifier not found
I am new to this issue so I will provide some other information that might help:
I have installed OpenSSL (x64 1.1.1g version).
I have linked libssl.lib and libcrypto.lib in my project.
I don't think that this is related to OpenSSL's configuration because I have already created a self-certificate.I think the issue is with cpp-httplib but I dont know how to fix it.

Answer 1

Try this. The definition must be before including the library.
#include "stdafx.h"
>>> #define CPPHTTPLIB_OPENSSL_SUPPORT
#include <httplib.h>
#include <Windows.h>
#include <iostream>
#define CA_CERT_FILE "./ca-bundle.crt"
using namespace std;
int main()
{
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
httplib::SSLClient cli("localhost", 8000);
//httplib::SSLClient cli("google.com");
// httplib::SSLClient cli("www.youtube.com");
cli.set_ca_cert_path(CA_CERT_FILE);
cli.enable_server_certificate_verification(true);
#else
httplib::Client cli("localhost", 8000);
#endif
char* x = { "hello world" };
httplib::Params params{
{ "key", x }
};
auto res = cli.Post("/postReq/", params);
if (res) {
cout << res->status << endl;
cout << res->get_header_value("Content-Type") << endl;
cout << res->body << endl;
}
else {
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
auto result = cli.get_openssl_verify_result();
if (result) {
cout << "error";
cout << "verify error: " << X509_verify_cert_error_string(result) << endl;
}
#endif
}
system("pause");
return 0;
}