From b76394834a3e36e8c376913cd9666a8d7a4cea45 Mon Sep 17 00:00:00 2001
From: Andrey Andreev <narf@devilix.net>
Date: Mon, 8 Jun 2015 14:44:47 +0300
Subject: Fix #3890

---
 system/core/Input.php               | 18 +++++++++++++-----
 user_guide_src/source/changelog.rst |  1 +
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/system/core/Input.php b/system/core/Input.php
index 12332cf51..b0bbb7b8d 100644
--- a/system/core/Input.php
+++ b/system/core/Input.php
@@ -799,19 +799,27 @@ class CI_Input {
 	 */
 	public function get_request_header($index, $xss_clean = FALSE)
 	{
-		if (empty($this->headers))
+		static $headers;
+
+		if ( ! isset($headers))
 		{
-			$this->request_headers();
+			empty($this->headers) OR $this->request_headers();
+			foreach ($this->headers as $key => $value)
+			{
+				$headers[strtolower($key)] = $value;
+			}
 		}
 
-		if ( ! isset($this->headers[$index]))
+		$index = strtolower($index);
+
+		if ( ! isset($headers[$index]))
 		{
 			return NULL;
 		}
 
 		return ($xss_clean === TRUE)
-			? $this->security->xss_clean($this->headers[$index])
-			: $this->headers[$index];
+			? $this->security->xss_clean($headers[$index])
+			: $headers[$index];
 	}
 
 	// --------------------------------------------------------------------
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 5c2c4d944..7e14152e3 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -30,6 +30,7 @@ Bug fixes for 3.0.1
 -  Fixed a bug (#3846) - :doc:`Image Manipulation Library <libraries/image_lib>` method `image_mirror_gd()` didn't properly initialize its variables.
 -  Fixed a bug (#3854) - `field_data()` didn't work properly with the Oracle (OCI8) database driver.
 -  Fixed a bug in the :doc:`Database Utility Class <database/utilities>` method ``csv_from_result()`` didn't work with a whitespace CSV delimiter.
+-  Fixed a bug (#3890) - :doc:`Input Library <libraries/input>` method ``get_request_header()`` treated header names as case-sensitive.
 
 Version 3.0.0
 =============
-- 
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