closes issue10484 - Fix the http.server's cgi PATH_INFO handling problem

Lib/http/server.py

@@ -865,7 +865,14 @@ def _url_collapse_path_split(path):
     # Filter out blank non trailing parts before consuming the '..'.
     path_parts = [part for part in path_parts[:-1] if part] + path_parts[-1:]
     if path_parts:
-        tail_part = path_parts.pop()
+        # Special case for CGI's for PATH_INFO
+        if path.startswith('/cgi-bin') or path.startswith('/htbin'):
+            tail_part = []
+            while path_parts[-1] not in ('cgi-bin','htbin'):
+                tail_part.insert(0,path_parts.pop())
+            tail_part = "/".join(tail_part)
+        else:
+            tail_part = path_parts.pop()
     else:
         tail_part = ''
     head_parts = []

Lib/test/test_httpservers.py

@@ -377,6 +377,7 @@ class CGIHTTPServerTestCase(BaseTestCase):
             '/.//': ('/', ''),
             'cgi-bin/file1.py': ('/cgi-bin', 'file1.py'),
             '/cgi-bin/file1.py': ('/cgi-bin', 'file1.py'),
+            '/cgi-bin/file1.py/PATH-INFO': ('/cgi-bin', 'file1.py/PATH-INFO'),
             'a': ('/', 'a'),
             '/a': ('/', 'a'),
             '//a': ('/', 'a'),

Misc/NEWS

@@ -24,6 +24,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #10484: Fix the CGIHTTPServer's PATH_INFO handling problem.
+
 - Issue #11199: Fix the with urllib which hangs on particular ftp urls.
 
 - Issue #14222: Use the new time.steady() function instead of time.time() for