diff --git a/gunicorn/http/message.py b/gunicorn/http/message.py
index a31511ad..e31844df 100644
--- a/gunicorn/http/message.py
+++ b/gunicorn/http/message.py
@@ -62,18 +62,20 @@ class Message(object):
     def set_body_reader(self):
         chunked = False
         clength = None
-
         for (name, value) in self.headers:
-            if name.upper() == "CONTENT-LENGTH":
+            if name == "CONTENT-LENGTH":
                 try:
                     clength = int(value)
                 except ValueError:
                     clength = None
-            elif name.upper() == "TRANSFER-ENCODING":
+            elif name == "TRANSFER-ENCODING":
                 chunked = value.lower() == "chunked"
-            elif name.upper() == "SEC-WEBSOCKET-KEY1":
+            elif name == "SEC-WEBSOCKET-KEY1":
                 clength = 8
-        
+
+            if clength is not None or chunked:
+                break
+
         if chunked:
             self.body = Body(ChunkedReader(self, self.unreader))
         elif clength is not None:
@@ -83,11 +85,13 @@ class Message(object):
 
     def should_close(self):
         for (h, v) in self.headers:
-            if h.lower() == "connection":
-                if v.lower().strip() == "close":
+            if h == "CONNECTION":
+                v = v.lower().strip()
+                if v == "close":
                     return True
-                elif v.lower().strip() == "keep-alive":
+                elif v == "keep-alive":
                     return False
+                break
         return self.version <= (1, 0)
 
 
diff --git a/gunicorn/http/wsgi.py b/gunicorn/http/wsgi.py
index 7f55c377..d34335e9 100644
--- a/gunicorn/http/wsgi.py
+++ b/gunicorn/http/wsgi.py
@@ -32,24 +32,23 @@ def create(req, sock, client, server, cfg):
     content_type = ""
     content_length = ""
     for hdr_name, hdr_value in req.headers:
-        name = hdr_name.lower()
-        if name == "expect":
+        if hdr_name == "EXPECT":
             # handle expect
             if hdr_value.lower() == "100-continue":
                 sock.send("HTTP/1.1 100 Continue\r\n\r\n")
-        elif name == "x-forwarded-for":
+        elif hdr_name == "X-FORWARDED-FOR":
             forward = hdr_value
-        elif name == "x-forwarded-protocol" and hdr_value.lower() == "ssl":
+        elif hdr_name == "X-FORWARDED-PROTOCOL" and hdr_value.lower() == "ssl":
             url_scheme = "https"
-        elif name == "x-forwarded-ssl" and hdr_value.lower() == "on":
+        elif hdr_name == "X-FORWARDED-SSL" and hdr_value.lower() == "on":
             url_scheme = "https"
-        elif name == "host":
+        elif hdr_name == "HOST":
             server = hdr_value
-        elif name == "script_name":
+        elif hdr_name == "SCRIPT_NAME":
             script_name = hdr_value
-        elif name == "content-type":
+        elif hdr_name == "CONTENT-TYPE":
             content_type = hdr_value
-        elif name == "content-length":
+        elif hdr_name == "CONTENT-LENGTH":
             content_length = hdr_value
         else:
             continue
@@ -107,7 +106,7 @@ def create(req, sock, client, server, cfg):
     }
 
     for key, value in req.headers:
-        key = 'HTTP_' + key.upper().replace('-', '_')
+        key = 'HTTP_' + key.replace('-', '_')
         if key not in ('HTTP_CONTENT_TYPE', 'HTTP_CONTENT_LENGTH'):
             environ[key] = value