[PATCH] conf/nginx.conf: add example "privacy" log_format

[Hans-Christoph Steiner]

# HG changeset patch
# User Hans-Christoph Steiner <hans at eds.org>
# Date 1609333908 -3600
#      Wed Dec 30 14:11:48 2020 +0100
# Node ID 0e6fb2161806a4c4e3df54e2ed6523aca7c70e23
# Parent  82228f955153527fba12211f52bf102c90f38dfb
conf/nginx.conf: add example "privacy" log_format

The standard log_formats store detailed information which falls under
data regulations like the EU's GDPR and California's CCPA. This merge
request adds a suggested "privacy" log_format that generates logs that
cannot be used to identify users. This has been developed and used by
Tor Project, Guardian Project, and F-Droid.

* 
https://guardianproject.info/2017/06/08/tracking-usage-without-tracking-people
* https://gitweb.torproject.org/webstats.git/tree/src/sanitize.py
* https://f-droid.org/2019/04/15/privacy-preserving-analytics.html

diff -r 82228f955153 -r 0e6fb2161806 conf/nginx.conf
--- a/conf/nginx.conf	Tue Dec 15 17:41:39 2020 +0300
+++ b/conf/nginx.conf	Wed Dec 30 14:11:48 2020 +0100
@@ -21,6 +21,8 @@
      #log_format  main  '$remote_addr - $remote_user [$time_local] 
"$request" '
      #                  '$status $body_bytes_sent "$http_referer" '
      #                  '"$http_user_agent" "$http_x_forwarded_for"';
+    #log_format privacy '0.0.0.0 - - [$time_local] "$request" '
+    #                   '$status $body_bytes_sent "$http_referer" "-"';

      #access_log  logs/access.log  main;


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