Describe the mirroring protocol. Drop URLs that don't

need to be mirrored.

pep-0381.txt

@@ -87,14 +87,12 @@ Examples:
 Special pages a mirror needs to provide
 =======================================
 
-A mirror is a strict copy of PyPI, so it provides the same structure
+A mirror is a subset copy of PyPI, so it provides the same structure
 by copying it.
 
-- pypi: html version of the package index
 - simple: rest version of the package index
 - packages: packages, stored by Python version, and letters
-- stats : statistics on downloads
-- XXX
+- serversig: signatures for the simple pages
 
 It also needs to provide two specific elements:
 
@@ -166,9 +164,19 @@ relevant links, plus a small part about `User-Agent`.
 The mirroring protocol
 ::::::::::::::::::::::
 
-XXX Need to describe the protocol here.
+Mirrors must reduce the amount of data transfered between the central
+server and the mirror. To achieve that, they MUST use the changelog()
+PyPI XML-RPC call, and only refetch the packages that have been
+changed since the last time. For each package P, they MUST copy
+documents /simple/P/ and /serversig/P. If a package is deleted on the
+central server, they MUST delete the package and all associated files.
+To detect modification of package files, they MAY cache the file's
+ETag, and MAY request skipping it using the If-none-match header.
 
-The z3c.pypimirror package [#zcpkg]_ provides an application that
+Each mirroring tool MUST identify itself using a descripte User-agent
+header.
+
+The pep381client package [#pep381client]_ provides an application that
 respects this protocol to browse PyPI.
 
 User-agent request header 
@@ -190,13 +198,13 @@ How a client can use PyPI and its mirrors
 :::::::::::::::::::::::::::::::::::::::::
 
 Clients that are browsing PyPI should be able to use alternative
-mirrors, by getting the list of the mirrors using `mirrors.pypi.python.org`.
+mirrors, by getting the list of the mirrors using `last.pypi.python.org`.
 
 Code example::
 
     >>> import socket
-    >>> socket.gethostbyname_ex('mirrors.pypi.python.org')[-1]
-    ['82.94.164.163', '88.191.64.248']
+    >>> socket.gethostbyname_ex('last.pypi.python.org')[0]
+    'h.pypi.python.org'
 
 The clients so far that could use this mechanism:
 
@@ -268,8 +276,8 @@ References
 .. [#pep305]
    http://www.python.org/dev/peps/pep-0305/#id19
 
-.. [#zcpkg]
-   http://pypi.python.org/pypi/z3c.pypimirror
+.. [#pep381client]
+   http://pypi.python.org/pypi/pep381client
 
 .. [#iso8601]
    http://en.wikipedia.org/wiki/ISO_8601
@@ -290,10 +298,10 @@ References
    http://www.chrisarndt.de/projects/eggbasket
 
 
-Aknowledgments
-==============
+Acknowledgments
+===============
 
-Martin von Loewis, Georg Brandl.
+Georg Brandl.
 
 
 Copyright