diff --git a/stapler/handlers.py b/stapler/handlers.py
index 0fe7504..c1ce354 100644
--- a/stapler/handlers.py
+++ b/stapler/handlers.py
@@ -369,7 +369,7 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler, BaseHandler):
     @property
     def target_redirect(self) -> str:
         if self.__target_redirect is None:
-            self.__target_redirect = self._get_header(self.REDIRECT_HEADER).lower()
+            self.__target_redirect = self._get_header(self.REDIRECT_HEADER)
         return self.__target_redirect
 
     @property
@@ -379,7 +379,7 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler, BaseHandler):
     @property
     def target_proxy(self) -> str:
         if self.__target_proxy is None:
-            self.__target_proxy = self._get_header(self.PROXY_HEADER).lower()
+            self.__target_proxy = self._get_header(self.PROXY_HEADER)
         return self.__target_proxy
 
     @property
@@ -389,7 +389,7 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler, BaseHandler):
     @property
     def target_spa(self) -> str:
         if self.__target_spa is None:
-            self.__target_spa = self._get_header(self.SPA_HEADER).lower()
+            self.__target_spa = self._get_header(self.SPA_HEADER)
         return self.__target_spa
 
     @property