hgweb: store the raw WSGI environment dict

We need this so we can construct a new request instance
from the original dict.

Differential Revision: https://phab.mercurial-scm.org/D2831

mercurial/hgweb/hgweb_mod.py

@@ -312,7 +312,7 b' class hgweb(object):'
 
         # This state is global across all threads.
         encoding.encoding = rctx.config('web', 'encoding')
-        rctx.repo.ui.environ = wsgireq.env
+        rctx.repo.ui.environ = req.rawenv
 
         if rctx.csp:
             # hgwebdir may have added CSP header. Since we generate our own,

mercurial/hgweb/request.py

@@ -149,6 +149,8 b' class parsedrequest(object):'
     headers = attr.ib()
     # Request body input stream.
     bodyfh = attr.ib()
+    # WSGI environment dict, unmodified.
+    rawenv = attr.ib()
 
 def parserequestfromenv(env, bodyfh, reponame=None, altbaseurl=None):
     """Parse URL components from environment variables.
@@ -342,7 +344,8 b' def parserequestfromenv(env, bodyfh, rep'
                          querystring=querystring,
                          qsparams=qsparams,
                          headers=headers,
-                         bodyfh=bodyfh)
+                         bodyfh=bodyfh,
+                         rawenv=env)
 
 class offsettrackingwriter(object):
     """A file object like object that is append only and tracks write count.