// Setup curl
std::shared_ptr<CurlHolder> curl_(new CurlHolder());

// Set request url
std::string url{"http://httpbin.org/put"};
curl_easy_setopt(curl_->handle, CURLOPT_URL, url.c_str());

// Set payload
std::string body{"world"};
curl_easy_setopt(curl_->handle, CURLOPT_POSTFIELDSIZE_LARGE, static_cast<curl_off_t>(body.length()));
curl_easy_setopt(curl_->handle, CURLOPT_COPYPOSTFIELDS, body.c_str());

// Upload byte 6 to 10 of string "hello world" -> "world" (5 bytes) using a ranged PUT request
// Range values
curl_off_t resume_from = static_cast<curl_off_t>(6);
curl_off_t filesize = static_cast<curl_off_t>(11);

// Create custom Content-Range header described in https://curl.se/mail/lib-2019-05/0012.html
constexpr int max_header_char_count{256};
std::array<char, max_header_char_count> range_header{};
sprintf(range_header.data(),
        "Content-Range: bytes %" CURL_FORMAT_CURL_OFF_T
        "-"
        "%" CURL_FORMAT_CURL_OFF_T "/*",                      /**/
        resume_from, filesize - 1);
std::string range_header_str = std::string(range_header.data());
curl_slist* chunk = nullptr;
chunk = curl_slist_append(chunk, range_header_str.c_str());
curl_easy_setopt(curl_->handle, CURLOPT_HTTPHEADER, chunk);
curl_slist_free_all(curl_->chunk);
curl_->chunk = chunk;

// Set range values
curl_easy_setopt(curl_->handle, CURLOPT_RESUME_FROM_LARGE, resume_from);
curl_easy_setopt(curl_->handle, CURLOPT_INFILESIZE_LARGE, filesize);

// Perform PUT request
curl_easy_setopt(curl_->handle, CURLOPT_CUSTOMREQUEST, "PUT");
curl_easy_perform(curl_->handle);