wsgi_test.py: add test cases that send content-length explicitly and trigger...

wsgi_test.py: add test cases that send content-length explicitly and trigger double content-length header bug

Thanks to Jason Toffaletti for providing the test case.

greentest/wsgi_test.py

@@ -48,6 +48,21 @@ def hello_world(env, start_response):
     return ["hello world"]
 
 
+def hello_world_explicit_content_length(env, start_response):
+    if env['PATH_INFO'] == 'notexist':
+        msg = 'not found'
+        start_response('404 Not Found',
+                       [('Content-type', 'text/plain'),
+                        ('Content-Length', len(msg))])
+        return [msg]
+
+    msg = 'hello world'
+    start_response('200 OK',
+                   [('Content-type', 'text/plain'),
+                    ('Content-Length', len(msg))])
+    return [msg]
+
+
 def hello_world_yield(env, start_response):
     if env['PATH_INFO'] == 'notexist':
         start_response('404 Not Found', [('Content-type', 'text/plain')])
@@ -251,6 +266,11 @@ class TestHttpdBasic(TestCase):
         fd.close()
 
 
+class TestExplicitContentLength(TestHttpdBasic):
+
+    application = staticmethod(hello_world_explicit_content_length)
+
+
 class TestYield(TestHttpdBasic):
 
     application = staticmethod(hello_world_yield)