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-rw-r--r--doc/spec/proposals/ideas/xxx-using-spdy.txt13
1 files changed, 10 insertions, 3 deletions
diff --git a/doc/spec/proposals/ideas/xxx-using-spdy.txt b/doc/spec/proposals/ideas/xxx-using-spdy.txt
index 48c51a0e2d..d733a84b69 100644
--- a/doc/spec/proposals/ideas/xxx-using-spdy.txt
+++ b/doc/spec/proposals/ideas/xxx-using-spdy.txt
@@ -69,6 +69,12 @@ Target:
a HTTP <-> SPDY proxy may improve Tor performance, by some
amount.
+ The consequences on caching need to be considered carefully.
+ Most of the optimizations SPDY offers have no effect because
+ the existing HTTP cache control headers are transmitted without
+ modification. Server push is more problematic, because here
+ the server may push a resource that the client already has.
+
3. Design outline
One way to implement the SPDY proxy is for Tor exit nodes to
@@ -77,9 +83,10 @@ Target:
destined for port 80.
Then, rather than sending the usual RELAY_BEGIN cell, the OP
- would send a RELAY_SPDY_BEGIN cell, to indicate that the exit
- node should translate between SPDY and HTTP. The rest of the
- connection process would operate as usual.
+ would send a RELAY_BEGIN_TRANSFORMED cell, with a parameter to
+ indicate that the exit node should translate between SPDY and
+ HTTP. The rest of the connection process would operate as
+ usual.
There would need to be some way of elegantly handling non-HTTP
traffic which goes over port 80.