Method add

src/curl_header.cpp:60–68

    // Implementation of add overloaded method.
    void curl_header::add(const string &header)
    {
        this->headers = curl_slist_append(this->headers, header.c_str());
        if (this->headers == nullptr)
        {
            throw curl_exception("Null pointer exception", __FUNCTION__);
        }
        ++this->size;
    }
}