quote plus in filenames to work around a bug in the S3 server

(LP: #1003633)

debian/changelog

@@ -26,6 +26,8 @@ apt (0.9.7.8) UNRELEASED; urgency=low
       (potentially) used for non deb,dsc content that may contain
       spaces, thanks to Daniel Hartwig and Thomas Bushnell 
       (LP: #1086997)
+    - quote plus in filenames to work around a bug in the S3 server
+      (LP: #1003633)
 
  -- Christian Perrier <bubulle@debian.org>  Mon, 24 Dec 2012 07:01:20 +0100
 

methods/http.cc

@@ -685,8 +685,12 @@ void HttpMethod::SendReq(FetchItem *Itm,CircleBuf &Out)
       pass it on, HTTP/1.1 says the connection should default to keep alive
       and we expect the proxy to do this */
    if (Proxy.empty() == true || Proxy.Host.empty())
+   {
+      // see LP bugs #1003633 and #1086997. The "+" is encoded as a workaround
+      // for a amazon S3 bug
       sprintf(Buf,"GET %s HTTP/1.1\r\nHost: %s\r\nConnection: keep-alive\r\n",
-	      QuoteString(Uri.Path,"~ ").c_str(),ProperHost.c_str());
+	      QuoteString(Uri.Path,"+~ ").c_str(),ProperHost.c_str());
+   }
    else
    {
       /* Generate a cache control header if necessary. We place a max