diff --git a/src/core/curl_exception.cpp b/src/core/curl_exception.cpp
index e39931e..b824049 100644
--- a/src/core/curl_exception.cpp
+++ b/src/core/curl_exception.cpp
@@ -19,12 +19,16 @@
 #include "curl_exception.h"
 using namespace bot::exception;
 
-curl_exception::curl_exception(const std::string &message, CURLcode error_code) : m_message(message), m_error_code(error_code) {
+curl_exception::curl_exception(const std::string &message, CURLcode error) : m_message(message), m_error(error) {
 }
 
 curl_exception::~curl_exception() noexcept {
 }
 
-const char* curl_exception::what() const noexcept {
-    return m_message.c_str();
+CURLcode curl_exception::error() const noexcept {
+    return m_error;
+}
+
+const char* curl_exception::what() const noexcept {
+    return !m_message.empty() ? m_message.c_str() : curl_easy_strerror(m_error);
 }
diff --git a/src/core/curl_exception.h b/src/core/curl_exception.h
index 0fddb24..ddc1187 100644
--- a/src/core/curl_exception.h
+++ b/src/core/curl_exception.h
@@ -27,13 +27,14 @@ namespace bot {
     namespace exception {
         class curl_exception : public std::exception {
         public:
-            explicit curl_exception(const std::string &message, CURLcode error_code);
+            explicit curl_exception(const std::string &message, CURLcode error);
             virtual ~curl_exception() noexcept;
+            CURLcode error() const noexcept;
             const char* what() const noexcept override;
 
         private:
-            const std::string m_message;
-            const CURLcode m_error_code;
+            std::string m_message;
+            CURLcode m_error;
         };
     }
 };
diff --git a/src/core/http_request.cpp b/src/core/http_request.cpp
index 400206c..054a241 100644
--- a/src/core/http_request.cpp
+++ b/src/core/http_request.cpp
@@ -40,7 +40,7 @@ const http_response http_request::get(const std::string &url, const http_headers
         curl_easy_getinfo(instance, CURLINFO_RESPONSE_CODE, &response.status);
     curl_easy_reset(instance);
     return result == CURLE_OK ?
-               response : throw bot::exception::curl_exception(strlen(error) ? error : curl_easy_strerror(result), result);
+               response : throw bot::exception::curl_exception(error, result);
 }
 
 const http_response http_request::post(const std::string &url, const std::string &content, const http_headers &headers) {
@@ -58,7 +58,7 @@ const http_response http_request::post(const std::string &url, const std::string
         curl_easy_getinfo(instance, CURLINFO_RESPONSE_CODE, &response.status);
     curl_easy_reset(instance);
     return result == CURLE_OK ?
-               response : throw bot::exception::curl_exception(strlen(error) ? error : curl_easy_strerror(result), result);
+               response : throw bot::exception::curl_exception(error, result);
 }
 
 std::string http_request::legacy_url(const std::string &hostname, uint16_t port, const std::string &url, bool tls) {