Error handling and testcase improve

Lib/http/server.py

@@ -132,7 +132,7 @@
 """
 
 DEFAULT_ERROR_CONTENT_TYPE = "text/html;charset=utf-8"
-RANGE_REGEX_PATTERN = re.compile(r'bytes=(\d*)-(\d*)$')
+RANGE_REGEX_PATTERN = re.compile(r'bytes=(\d*)-(\d*)$', re.IGNORECASE)
 
 class HTTPServer(socketserver.TCPServer):
 
@@ -916,16 +916,13 @@ def copyfile(self, source, outputfile, *, range=None):
             start, end = range
             length = end - start + 1
             source.seek(start)
-            while True:
-                if length <= 0:
-                    break
+            while length > 0:
                 buf = source.read(min(length, shutil.COPY_BUFSIZE))
                 if not buf:
-                    break
+                    raise EOFError('File shrank after size was checked')
                 length -= len(buf)
                 outputfile.write(buf)
 
-
     def guess_type(self, path):
         """Guess the type of a file.
 

Lib/test/test_httpservers.py

@@ -546,7 +546,7 @@ def test_range_get(self):
         self.check_status_and_reason(response, HTTPStatus.OK, data=self.data)
 
         # valid ranges
-        response = self.request(route, headers={'Range': 'bytes=3-12'})
+        response = self.request(route, headers={'Range': 'bYtEs=3-12'})  # case insensitive
         self.assertEqual(response.getheader('content-range'), 'bytes 3-12/30')
         self.assertEqual(response.getheader('content-length'), '10')
         self.check_status_and_reason(response, HTTPStatus.PARTIAL_CONTENT, data=self.data[3:13])
@@ -585,6 +585,10 @@ def test_range_get(self):
         response = self.request(route, headers={'Range': 'bytes=-'})
         self.check_status_and_reason(response, HTTPStatus.OK, data=self.data)
 
+        # multipart ranges (not supported currently)
+        response = self.request(route, headers={'Range': 'bytes=1-2, 4-7'})
+        self.check_status_and_reason(response, HTTPStatus.OK, data=self.data)
+
     def test_head(self):
         response = self.request(
             self.base_url + '/test', method='HEAD')