diff --git a/gunicorn/http/wsgi.py b/gunicorn/http/wsgi.py
index 12ac8e70..becbac89 100644
--- a/gunicorn/http/wsgi.py
+++ b/gunicorn/http/wsgi.py
@@ -78,17 +78,22 @@ def proxy_environ(req):
 def create(req, sock, client, server, cfg):
     resp = Response(req, sock, cfg)
 
+    # set initial environ
     environ = default_environ(req, sock, cfg)
 
+    # default variables
+    host = None
     url_scheme = "https" if cfg.is_ssl else "http"
     script_name = os.environ.get("SCRIPT_NAME", "")
 
+    # set secure_headers
     secure_headers = cfg.secure_scheme_headers
     if client and not isinstance(client, string_types):
         if ('*' not in cfg.forwarded_allow_ips
                 and client[0] not in cfg.forwarded_allow_ips):
             secure_headers = {}
 
+    # add the headers tot the environ
     for hdr_name, hdr_value in req.headers:
         if hdr_name == "EXPECT":
             # handle expect
@@ -97,8 +102,8 @@ def create(req, sock, client, server, cfg):
         elif secure_headers and (hdr_name in secure_headers and
               hdr_value == secure_headers[hdr_name]):
             url_scheme = "https"
-        elif hdr_name == "HOST":
-            server = hdr_value
+        elif hdr_name == 'HOST':
+            host = hdr_value
         elif hdr_name == "SCRIPT_NAME":
             script_name = hdr_value
         elif hdr_name == "CONTENT-TYPE":
@@ -113,8 +118,10 @@ def create(req, sock, client, server, cfg):
             hdr_value = "%s,%s" % (environ[key], hdr_value)
         environ[key] = hdr_value
 
+    # set the url schejeme
     environ['wsgi.url_scheme'] = url_scheme
 
+    # set the REMOTE_* keys in environ
     # authors should be aware that REMOTE_HOST and REMOTE_ADDR
     # may not qualify the remote addr:
     # http://www.ietf.org/rfc/rfc3875
@@ -124,26 +131,42 @@ def create(req, sock, client, server, cfg):
         environ['REMOTE_ADDR'] = client[0]
         environ['REMOTE_PORT'] = str(client[1])
 
+    # handle the SERVER_*
+    # Normally only the application should use the Host header but since the
+    # WSGI spec doesn't support unix sockets, we are using it to create
+    # viable SERVER_* if possible.
     if isinstance(server, string_types):
         server = server.split(":")
         if len(server) == 1:
-            if url_scheme == "http":
-                server.append("80")
-            elif url_scheme == "https":
-                server.append("443")
+            # unix socket
+            if host and host is not None:
+                server = host.split(':')
+                if len(server) == 1:
+                    if url_scheme == "http":
+                        server.append(80),
+                    elif url_scheme == "https":
+                        server.append(443)
+                    else:
+                        server.append('')
             else:
+                # no host header given which means that we are not behind a
+                # proxy, so append an empty port.
                 server.append('')
     environ['SERVER_NAME'] = server[0]
     environ['SERVER_PORT'] = str(server[1])
 
+    # set the path and script name
     path_info = req.path
     if script_name:
         path_info = path_info.split(script_name, 1)[1]
     environ['PATH_INFO'] = unquote_to_wsgi_str(path_info)
     environ['SCRIPT_NAME'] = script_name
 
+    # override the environ with the correct remote and server address if
+    # we are behind a proxy using the proxy protocol.
     environ.update(proxy_environ(req))
 
+    print(environ)
     return resp, environ