fix attachment etags, thanks Mark Hammond for the test case. closes COUCHDB-386

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@792774 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 25 insertions, 13 deletions

diff --git a/share/www/script/test/attachments.js b/share/www/script/test/attachments.js
index 7204475f..5470840a 100644
--- a/share/www/script/test/attachments.js
+++ b/share/www/script/test/attachments.js
@@ -202,4 +202,13 @@ couchTests.attachments= function(debug) {
   var doc = db.open("bin_doc5", {attachments:true});
   T(doc._attachments["lorem.txt"].data == lorem_b64);
 
+  // test etags for attachments.
+  var xhr = CouchDB.request("GET", "/test_suite_db/bin_doc5/lorem.txt");
+  T(xhr.status == 200);
+  var etag = xhr.getResponseHeader("etag");
+  console.log(etag)
+  xhr = CouchDB.request("GET", "/test_suite_db/bin_doc5/lorem.txt", {
+    headers: {"if-none-match": etag}
+  });
+  T(xhr.status == 304);
 };
diff --git a/src/couchdb/couch_httpd_db.erl b/src/couchdb/couch_httpd_db.erl
index fcbdc4c6..3b5fcbe8 100644
--- a/src/couchdb/couch_httpd_db.erl
+++ b/src/couchdb/couch_httpd_db.erl
@@ -774,19 +774,22 @@ db_attachment_req(#httpd{method='GET'}=Req, Db, DocId, FileNameParts) ->
     undefined ->
         throw({not_found, "Document is missing attachment"});
     {Type, Bin} ->
-        {ok, Resp} = start_chunked_response(Req, 200, [
-            {"ETag", couch_httpd:doc_etag(Doc)},
-            {"Cache-Control", "must-revalidate"},
-            {"Content-Type", binary_to_list(Type)}%,
-            % My understanding of http://www.faqs.org/rfcs/rfc2616.html
-            % says that we should not use Content-Length with a chunked
-            % encoding. Turning this off makes libcurl happy, but I am
-            % open to discussion.
-            % {"Content-Length", integer_to_list(couch_doc:bin_size(Bin))}
-            ]),
-        couch_doc:bin_foldl(Bin,
-                fun(BinSegment, _) -> send_chunk(Resp, BinSegment) end,[]),
-        send_chunk(Resp, "")
+        Etag = couch_httpd:doc_etag(Doc),
+        couch_httpd:etag_respond(Req, Etag, fun() ->
+            {ok, Resp} = start_chunked_response(Req, 200, [
+                {"ETag", Etag},
+                {"Cache-Control", "must-revalidate"},
+                {"Content-Type", binary_to_list(Type)}%,
+                % My understanding of http://www.faqs.org/rfcs/rfc2616.html
+                % says that we should not use Content-Length with a chunked
+                % encoding. Turning this off makes libcurl happy, but I am
+                % open to discussion. 
+                % {"Content-Length", integer_to_list(couch_doc:bin_size(Bin))}
+                ]),
+            couch_doc:bin_foldl(Bin,
+                    fun(BinSegment, _) -> send_chunk(Resp, BinSegment) end,[]),
+            send_chunk(Resp, "")
+        end)
     end;