Fixed #28081 -- Stopped setting Content-Length=0 in conditional_content_removal() per RFC 7230.

AUTHORS

@@ -380,6 +380,7 @@ answer newbie questions, and generally made Django that much better:
     Jiri Barton
     Joachim Jablon <ewjoachim@gmail.com>
     Joao Oliveira <joaoxsouls@gmail.com>
+    Joao Pedro Silva <j.pedro004@gmail.com>
     Joe Heck <http://www.rhonabwy.com/wp/>
     Joel Bohman <mail@jbohman.com>
     Joel Heenan <joelh-django@planetjoel.com>

django/test/client.py

@@ -99,7 +99,6 @@ def conditional_content_removal(request, response):
             response.streaming_content = []
         else:
             response.content = b''
-        response['Content-Length'] = '0'
     if request.method == 'HEAD':
         if response.streaming:
             response.streaming_content = []