http_wsgibase: Fix chunked encoding header split delimiter.

caucase/http_wsgibase.py

@@ -61,7 +61,7 @@ class ChunkedFile(ProxyFile):
           if len(chunk_header) > MAX_CHUNKED_HEADER_LENGTH:
             raise ValueError('Chunked encoding header too long')
           try:
-            chunk_length = int(chunk_header.split(' ', 1)[0], 16)
+            chunk_length = int(chunk_header.split(';', 1)[0], 16)
           except ValueError:
             raise ValueError('Invalid chunked encoding header')
           if not chunk_length: