------------------------------------------------------------
revno: 11847
revision-id: squid3@treenet.co.nz-20161217125941-aeubtf32hb2n5l3n
parent: squid3@treenet.co.nz-20161217102402-vbe31by79bp7y71q
fixes bug: http://bugs.squid-cache.org/show_bug.cgi?id=4169
author: Garri Djavadyan <garryd@comnet.uz>
committer: Amos Jeffries <squid3@treenet.co.nz>
branch nick: 3.2
timestamp: Sun 2016-12-18 01:59:41 +1300
message:
  Bug 4169: HIT marked as MISS when If-None-Match does not match
------------------------------------------------------------
# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: squid3@treenet.co.nz-20161217125941-aeubtf32hb2n5l3n
# target_branch: http://bzr.squid-cache.org/bzr/squid3/branches\
#   /SQUID_3_2
# testament_sha1: 98e187ae91a0492d13bf2e02b022858d6a67b9ce
# timestamp: 2016-12-17 13:00:06 +0000
# source_branch: http://bzr.squid-cache.org/bzr/squid3/3.2
# base_revision_id: squid3@treenet.co.nz-20161217102402-\
#   vbe31by79bp7y71q
# 
# Begin patch
=== modified file 'src/client_side.cc'
--- src/client_side.cc	2015-08-28 13:26:26 +0000
+++ src/client_side.cc	2016-12-17 12:59:41 +0000
@@ -455,6 +455,7 @@
         statCounter.client_http.nearHitSvcTime.count(svc_time);
         break;
 
+    case LOG_TCP_INM_HIT:
     case LOG_TCP_IMS_HIT:
         statCounter.client_http.nearMissSvcTime.count(svc_time);
         break;

=== modified file 'src/client_side_reply.cc'
--- src/client_side_reply.cc	2016-12-17 10:24:02 +0000
+++ src/client_side_reply.cc	2016-12-17 12:59:41 +0000
@@ -710,40 +710,27 @@
         return true;
     }
 
-    bool matchedIfNoneMatch = false;
     if (r.header.has(HDR_IF_NONE_MATCH)) {
-        if (!e->hasIfNoneMatchEtag(r)) {
-            // RFC 2616: ignore IMS if If-None-Match did not match
-            r.flags.ims = 0;
-            r.ims = -1;
-            r.imslen = 0;
-            r.header.delById(HDR_IF_MODIFIED_SINCE);
-            http->logType = LOG_TCP_MISS;
-            sendMoreData(result);
-            return true;
-        }
+        // RFC 7232: If-None-Match recipient MUST ignore IMS
+        r.flags.ims = false;
+        r.ims = -1;
+        r.imslen = 0;
+        r.header.delById(HDR_IF_MODIFIED_SINCE);
 
-        if (!r.flags.ims) {
-            // RFC 2616: if If-None-Match matched and there is no IMS,
-            // reply with 304 Not Modified or 412 Precondition Failed
+        if (e->hasIfNoneMatchEtag(r)) {
             sendNotModifiedOrPreconditionFailedError();
             return true;
         }
 
-        // otherwise check IMS below to decide if we reply with 304 or 412
-        matchedIfNoneMatch = true;
+        // None-Match is true (no ETag matched); treat as an unconditional hit
+        return false;
     }
 
     if (r.flags.ims) {
         // handle If-Modified-Since requests from the client
         if (e->modifiedSince(&r)) {
-            http->logType = LOG_TCP_IMS_HIT;
-            sendMoreData(result);
-
-        } else if (matchedIfNoneMatch) {
-            // If-None-Match matched, reply with 304 Not Modified or
-            // 412 Precondition Failed
-            sendNotModifiedOrPreconditionFailedError();
+            // Modified-Since is true; treat as an unconditional hit
+            return false;
 
         } else {
             // otherwise reply with 304 Not Modified
@@ -1880,7 +1867,12 @@
     StoreEntry *e = http->storeEntry();
     const time_t timestamp = e->timestamp;
     HttpReply *const temprep = e->getReply()->make304();
-    http->logType = LOG_TCP_IMS_HIT;
+    // log as TCP_INM_HIT if code 304 generated for
+    // If-None-Match request
+    if (!http->request->flags.ims)
+        http->logType = LOG_TCP_INM_HIT;
+    else
+        http->logType = LOG_TCP_IMS_HIT;
     removeClientStoreReference(&sc, http);
     createStoreEntry(http->request->method, request_flags());
     e = http->storeEntry();

=== modified file 'src/enums.h'
--- src/enums.h	2012-05-21 03:52:08 +0000
+++ src/enums.h	2016-12-17 12:59:41 +0000
@@ -45,6 +45,7 @@
     LOG_TCP_REFRESH_FAIL_ERR,   // refresh from origin failed, error forwarded
     LOG_TCP_REFRESH_MODIFIED,   // refresh from origin replaced existing entry
     LOG_TCP_CLIENT_REFRESH_MISS,
+    LOG_TCP_INM_HIT,
     LOG_TCP_IMS_HIT,
     LOG_TCP_SWAPFAIL_MISS,
     LOG_TCP_NEGATIVE_HIT,

=== modified file 'src/log/access_log.cc'
--- src/log/access_log.cc	2015-05-01 07:24:56 +0000
+++ src/log/access_log.cc	2016-12-17 12:59:41 +0000
@@ -584,6 +584,9 @@
     if (code == LOG_TCP_HIT)
         return 1;
 
+    if (code == LOG_TCP_INM_HIT)
+        return 1;
+
     if (code == LOG_TCP_IMS_HIT)
         return 1;