From 808b6212cc2d90f2ea6dbeb25f9ae4cb292fc19a Mon Sep 17 00:00:00 2001
From: Igor Pashev <pashev.igor@gmail.com>
Date: Thu, 24 Nov 2016 23:15:45 +0300
Subject: Added comments on proxying

---
 src/Sproxy/Application.hs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Sproxy/Application.hs b/src/Sproxy/Application.hs
index 8c3247c..18d547b 100644
--- a/src/Sproxy/Application.hs
+++ b/src/Sproxy/Application.hs
@@ -197,6 +197,9 @@ authorize db (authCookie, otherCookies) req = do
     setCookies cs = insert hCookie (toByteString . renderCookies $ cs)
 
 
+-- XXX If something seems strange, think about HTTP/1.1 <-> HTTP/1.0.
+-- FIXME For HTTP/1.0 backends we might need an option
+-- FIXME in config file. HTTP Client does HTTP/1.1 by default.
 forward :: BE.Manager -> W.Application
 forward mgr req resp = do
   let beReq = BE.defaultRequest
@@ -232,15 +235,20 @@ modifyRequestHeaders = filter (\(n, _) -> n `notElem` ban)
       , hTransferEncoding -- XXX Likewise
       ]
 
+
 modifyResponseHeaders :: ResponseHeaders -> ResponseHeaders
 modifyResponseHeaders = filter (\(n, _) -> n `notElem` ban)
   where
     ban =
       [
         hConnection
-      , hTransferEncoding -- XXX This is set automtically when sending respond from sproxy
+      -- XXX WAI docs say we MUST NOT add (keep) Content-Length, Content-Range, and Transfer-Encoding,
+      -- XXX but we use streaming body, which may add Transfer-Encoding only.
+      -- XXX Thus we keep Content-* headers.
+      , hTransferEncoding
       ]
 
+
 authenticationRequired :: ByteString -> HashMap Text OAuth2Client -> W.Application
 authenticationRequired key oa2 req resp = do
   Log.info $ "511 Unauthenticated: " ++ showReq req
-- 
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