[GNUnet-SVN] [taler-deployment] branch master updated: post mortem for exchange caching

[gnunet]

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dold pushed a commit to branch master
in repository deployment.

The following commit(s) were added to refs/heads/master by this push:
     new 0b69486  post mortem for exchange caching
0b69486 is described below

commit 0b69486dc16953d025c5ff2508281e84bfba81a0
Author: Florian Dold <address@hidden>
AuthorDate: Mon Jun 3 11:08:51 2019 +0200

    post mortem for exchange caching
---
 postmortem/2019-06-02-exchange-caching.txt | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/postmortem/2019-06-02-exchange-caching.txt 
b/postmortem/2019-06-02-exchange-caching.txt
new file mode 100644
index 0000000..6a739ee
--- /dev/null
+++ b/postmortem/2019-06-02-exchange-caching.txt
@@ -0,0 +1,29 @@
+# Exchange Wire Caching
+
+
+## Issue Summary
+
+When demoing Taler to an audience, sometimes withdrawing or other operations
+fail.  This can happen even with a fresh wallet.
+
+
+## Root Cause
+
+The browser caches the /keys and /wire response for a long time, even when the
+wallet is re-installed.
+
+Usually the cache expiration is set to when available denominations or signing
+keys are expected to change.  This can be a rather long time.  We often have 
format changes
+or re-deploys with different keys in-between.
+
+## Remediation and Prevention
+
+For demo and test, the exchange shall use shorter expiration times.
+(https://bugs.gnunet.org/view.php?id=5747)
+
+To force re-downloading of the exchange's information, we will implement
+a client-version parameter to break the browser's cache.
+(https://bugs.gnunet.org/view.php?id=5745)
+
+## Discussion
+

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