Index: Lib/wsgiref/util.py
===================================================================
--- Lib/wsgiref/util.py	(revision 87563)
+++ Lib/wsgiref/util.py	(working copy)
@@ -64,7 +64,7 @@
     """Return the full request URI, optionally including the query string"""
     url = application_uri(environ)
     from urllib.parse import quote
-    path_info = quote(environ.get('PATH_INFO',''))
+    path_info = quote(environ.get('PATH_INFO',''),safe='/;=,')
     if not environ.get('SCRIPT_NAME'):
         url += path_info[1:]
     else:
Index: Lib/test/test_wsgiref.py
===================================================================
--- Lib/test/test_wsgiref.py	(revision 87563)
+++ Lib/test/test_wsgiref.py	(working copy)
@@ -342,6 +342,10 @@
         self.checkReqURI("http://127.0.0.1/sp%C3%A4m", SCRIPT_NAME="/späm")
         self.checkReqURI("http://127.0.0.1/spammity/spam",
             SCRIPT_NAME="/spammity", PATH_INFO="/spam")
+        self.checkReqURI("http://127.0.0.1/spammity/spam;ham",
+            SCRIPT_NAME="/spammity", PATH_INFO="/spam;ham")
+        self.checkReqURI("http://127.0.0.1/spammity/spam;cookie=1234,5678",
+            SCRIPT_NAME="/spammity", PATH_INFO="/spam;cookie=1234,5678")
         self.checkReqURI("http://127.0.0.1/spammity/spam?say=ni",
             SCRIPT_NAME="/spammity", PATH_INFO="/spam",QUERY_STRING="say=ni")
         self.checkReqURI("http://127.0.0.1/spammity/spam", 0,