diff --git a/ate/context.py b/ate/context.py
index 0b3fb508..0a82cda7 100644
--- a/ate/context.py
+++ b/ate/context.py
@@ -5,7 +5,6 @@ import sys
 from collections import OrderedDict
 
 from ate import utils
-from ate.exception import ParamsError
 from ate.testcase import TestcaseParser
 
 
@@ -135,13 +134,6 @@ class Context(object):
         @param request_dict: request config mapping
         @param level: testset or testcase
         """
-        if "headers" in request_dict:
-            # convert keys in request headers to lowercase
-            headers = request_dict.pop("headers")
-            if not isinstance(headers, dict):
-                raise ParamsError("HTTP Request Headers invalid!")
-            request_dict["headers"] = {key.lower(): headers[key] for key in headers}
-
         if level == "testset":
             request_dict = self.testcase_parser.parse_content_with_bindings(
                 request_dict
diff --git a/ate/runner.py b/ate/runner.py
index c24a29cf..43ba8892 100644
--- a/ate/runner.py
+++ b/ate/runner.py
@@ -1,4 +1,4 @@
-from ate import exception, response
+from ate import exception, response, utils
 from ate.client import HttpSession
 from ate.context import Context
 
@@ -48,6 +48,9 @@ class Runner(object):
             }
         @param (str) context level, testcase or testset
         """
+        # convert keys in request headers to lowercase
+        config_dict = utils.lower_dict_key(config_dict)
+
         self.context.init_context(level)
         self.context.config_context(config_dict, level)
 
diff --git a/ate/utils.py b/ate/utils.py
index 02ad1058..74ef7be8 100644
--- a/ate/utils.py
+++ b/ate/utils.py
@@ -329,3 +329,20 @@ def search_conf_item(start_path, item_type, item_name):
             raise exception.VariableNotFound(err_msg)
 
     return search_conf_item(dir_path, item_type, item_name)
+
+def lower_dict_key(origin_dict, depth=1):
+    """ convert dict key to lower case, with depth control supported.
+    """
+    new_dict = {}
+
+    for key, value in origin_dict.items():
+        if depth > 2:
+            new_dict[key] = value
+            continue
+
+        if isinstance(value, dict):
+            value = lower_dict_key(value, depth+1)
+
+        new_dict[key.lower()] = value
+
+    return new_dict
diff --git a/tests/test_context.py b/tests/test_context.py
index 0b40d6f5..ef276be4 100644
--- a/tests/test_context.py
+++ b/tests/test_context.py
@@ -178,26 +178,6 @@ class VariableBindsUnittest(unittest.TestCase):
             SECRET_KEY = context_variables["SECRET_KEY"]
             self.assertEqual(SECRET_KEY, "DebugTalk")
 
-    def test_parse_request(self):
-        request_dict = {
-            "url": "http://debugtalk.com",
-            "method": "GET",
-            "headers": {
-                "Content-Type": "application/json",
-                "USER-AGENT": "ios/10.3"
-            }
-        }
-
-        parsed_request = self.context.get_parsed_request(request_dict)
-        self.assertIn("content-type", parsed_request["headers"])
-        self.assertIn("user-agent", parsed_request["headers"])
-
-        request_dict = {
-            "headers": "invalid headers"
-        }
-        with self.assertRaises(ParamsError):
-            self.context.get_parsed_request(request_dict)
-
     def test_get_parsed_request(self):
         test_runner = runner.Runner()
         testcase = {
@@ -210,14 +190,14 @@ class VariableBindsUnittest(unittest.TestCase):
             ],
             "request": {
                 "url": "http://127.0.0.1:5000/api/users/1000",
-                "method": "POST",
-                "headers": {
+                "METHOD": "POST",
+                "Headers": {
                     "Content-Type": "application/json",
                     "authorization": "$authorization",
                     "random": "$random",
                     "SECRET_KEY": "$SECRET_KEY"
                 },
-                "data": "$data"
+                "Data": "$data"
             }
         }
         parsed_request = test_runner.init_config(testcase, level="testcase")
@@ -227,7 +207,7 @@ class VariableBindsUnittest(unittest.TestCase):
         self.assertEqual(len(parsed_request["headers"]["random"]), 5)
         self.assertIn("data", parsed_request)
         self.assertEqual(parsed_request["data"], testcase["variable_binds"][2]["data"])
-        self.assertEqual(parsed_request["headers"]["secret_key"], "DebugTalk")
+        self.assertEqual(parsed_request["headers"]["SECRET_KEY"], "DebugTalk")
 
     def test_exec_content_functions(self):
         test_runner = runner.Runner()
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 51babe00..92e87103 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -293,3 +293,23 @@ class TestUtils(ApiServerUnittest):
 
         self.assertFalse(utils.is_variable(("os", os)))
         self.assertFalse(utils.is_variable(("utils", utils)))
+
+    def test_lower_dict_key(self):
+        origin_dict = {
+            "Name": "test",
+            "Request": {
+                "url": "http://127.0.0.1:5000",
+                "METHOD": "POST",
+                "Headers": {
+                    "Accept": "application/json",
+                    "User-Agent": "ios/9.3"
+                }
+            }
+        }
+        new_dict = utils.lower_dict_key(origin_dict)
+        self.assertIn("name", new_dict)
+        self.assertIn("request", new_dict)
+        self.assertIn("method", new_dict["request"])
+        self.assertIn("headers", new_dict["request"])
+        self.assertIn("Accept", new_dict["request"]["headers"])
+        self.assertIn("User-Agent", new_dict["request"]["headers"])