Fix for #535 (Apache re-processes Range headers). _cpmodpy now uses a new "ignore_headers(['Range'])" Tool by default.

1 files changed, 13 insertions, 0 deletions

diff --git a/cherrypy/lib/cptools.py b/cherrypy/lib/cptools.py
index 43c010c7..f3f374ea 100644
--- a/cherrypy/lib/cptools.py
+++ b/cherrypy/lib/cptools.py
@@ -122,6 +122,19 @@ def proxy(base=None, local='X-Forwarded-Host', remote='X-Forwarded-For'):
             request.remote.ip = xff
 
 
+def ignore_headers(headers=('Range',)):
+    """Delete request headers whose field names are included in 'headers'.
+    
+    This is a useful tool for working behind certain HTTP servers;
+    for example, Apache duplicates the work that CP does for 'Range'
+    headers, and will doubly-truncate the response.
+    """
+    request = cherrypy.request
+    for name in headers:
+        if name in request.headers:
+            del request.headers[name]
+
+
 def response_headers(headers=None):
     """Set headers on the response."""
     for name, value in (headers or []):