fix SERVER_SOFTWARE property

WSGI spec requires the SERVER_SOFTWARE property containing the name and version. This change fix it and separate the version header from SERVER_SOFTWARE property. We expose the SERVER variable so custom installations can change it in one place without looking much when needed.

Author: benoitc

gunicorn/__init__.py

@@ -5,4 +5,6 @@
 
 version_info = (20, 0, 4)
 __version__ = ".".join([str(v) for v in version_info])
-SERVER_SOFTWARE = "gunicorn"
+SERVER = "gunicorn"
+SERVER_SOFTWARE = "%s/%s" % (SERVER, __version__)
+

gunicorn/http/wsgi.py

@@ -11,7 +11,7 @@
 
 from gunicorn.http.message import HEADER_RE
 from gunicorn.http.errors import InvalidHeader, InvalidHeaderName
-from gunicorn import SERVER_SOFTWARE
+from gunicorn import SERVER_SOFTWARE, SERVER
 import gunicorn.util as util
 
 # Send files in at most 1GB blocks as some operating systems can have problems
@@ -195,7 +195,7 @@ class Response(object):
  def __init__(self, req, sock, cfg):
  self.req = req
  self.sock = sock
- self.version = SERVER_SOFTWARE
+ self.version = SERVER
  self.status = None
  self.chunked = False
  self.must_close = False