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Reason given for failure:

    CSRF token missing or incorrect.

In general, this can occur when there is a genuine Cross Site Request Forgery, or whenDjango’s CSRF mechanism has not been used correctly. For POST forms,
you need to ensure:

• The view function uses
  RequestContext for the template, instead of Context.
• In the template, there is a {% csrf_token %}template tag inside each POST form that targets an internal URL.
• If you are not using CsrfViewMiddleware, then you must use
csrf_protect on any views that use the csrf_token template tag, as well as those that accept the POST data.

解决办法：在视图中：

from django.template import RequestContext

return render_to_response("books/contact.html",{"form":form},context_instance=RequestContext(request))