diff --git a/src/mastodon-cpp.cpp b/src/mastodon-cpp.cpp
index 332603c..f54c117 100644
--- a/src/mastodon-cpp.cpp
+++ b/src/mastodon-cpp.cpp
@@ -20,6 +20,7 @@
 #include <utility>
 #include <iostream>
 #include <exception>
+#include <algorithm>
 #include <Poco/Net/FilePartSource.h>
 #include <Poco/URI.h>
 #include "version.hpp"
@@ -265,10 +266,13 @@ return_call API::register_app2(const string &client_id,
     return ret;
 }
 
-const string API::get_header(const std::string &header) const
+const string API::get_header(std::string header) const
 {
     string headers;
     _http.get_headers(headers);
+    std::transform(headers.begin(), headers.end(), headers.begin(), ::tolower);
+    std::transform(header.begin(), header.end(), header.begin(), ::tolower);
+
     size_t startpos = headers.find(header + ':');
     if (startpos != std::string::npos)
     {
diff --git a/src/mastodon-cpp.hpp b/src/mastodon-cpp.hpp
index 98c0b37..57e44f5 100644
--- a/src/mastodon-cpp.hpp
+++ b/src/mastodon-cpp.hpp
@@ -411,7 +411,7 @@ namespace Mastodon
                                   string &access_token);
 
         /*!
-         *  @brief  Gets the header from the last answer.
+         *  @brief  Gets the header from the last answer. Case insensitive.
          *
          *  @param  header  The header to get
          *
@@ -419,7 +419,7 @@ namespace Mastodon
          *
          *  @since  before 0.11.0
          */
-        const string get_header(const string &header) const;
+        const string get_header(string header) const;
 
         /*!
          *  @brief  Turn exceptions on or off. Defaults to off.