Reoccuring error theme: "an if-martch header was specified and the resource did not exist"

lex · July 21, 2017, 8:04am

HI Folx,

I am wondering because so and so often (every few days) I am running into an error that some file wont get synced. I am usually working with PDF files, they get changed, renamed or ammendet oder whatever and every once in a while a file suddenly wont sync and I get this error message

Precondition failed (An If-Match header was specified and the resource did not exist)

Usually, I can work around by duplicating that file, deleting the old one, changing name etc, but sometimes this doesnt work as well.

Anybody got ideas where to look? Running last version of NC 11

Thanks!

tflidd · July 22, 2017, 8:37am

Can you check your server logfiles? Error appears via desktop client, are there any problems on the web-interface?

Did you change the files manually in the data-folder?

other report with same error: Error: server replied: Precondition failed

lex · July 23, 2017, 9:07am

I did not manually change any files, only working on the files on the computer desktop which is connected via sync client of course.

Didnt see anything in the log files, though I have to look again next time to be sure

lex · August 20, 2017, 2:07pm

I am still continuing to experience that error and frankly I have no clue where it comes from. Any more ideas?

tflidd · August 20, 2017, 9:08pm

The developers found a bug in the 2.3.2 version of the client:

github.com/owncloud/client

Client uses old chunking protocol with new DAV endpoint "Precondition failed" "An If-Match header was specified and the resource did not exist"

opened 02:02PM - 23 Jun 17 UTC

closed 11:15AM - 11 Jul 17 UTC

PVince81

bug p2-high

### Steps Follow the steps from https://github.com/owncloud/core/issues/28197… and observe access log. The linked ticket is about a received shared file (not folder, not file in shared folder). When upload+overwriting this special file (which is also a shared mount / mount point), the client somehow decides to use the **old chunking** approach but with the **new endpoint**: ``` {"reqId":"sFrpwigItQogTHW5WblS","level":0,"time":"2017-06-23T13:28:48+00:00","remoteAddr":"127.0.0.1","user":"admin","app":"webdav","method":"PUT","url":"\/owncloud\/remote.php\/dav\/files\/admin\/data1.dat-chunking-3886638851-13-1","message":"Exception: {\"Message\":\"HTTP\\\/1.1 412 An If-Match header was specified and the resource did not exist\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\PreconditionFailed\",\"Code\":0,\"Trace\":\"#0 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(474): Sabre\\\\DAV\\\\Server->checkPreconditions(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#1 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Server.php(229): Sabre\\\\DAV\\\\Server->exec()\\n#3 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#4 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/remote.php(165): require_once('\\\/srv\\\/www\\\/htdocs...')\\n#5 {main}\",\"File\":\"\\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1309,\"User\":\"admin\"}"} {"reqId":"gvl4Qhlae2wIh7VHzOHt","level":0,"time":"2017-06-23T13:28:48+00:00","remoteAddr":"127.0.0.1","user":"admin","app":"webdav","method":"PUT","url":"\/owncloud\/remote.php\/dav\/files\/admin\/data1.dat-chunking-3886638851-13-2","message":"Exception: {\"Message\":\"HTTP\\\/1.1 412 An If-Match header was specified and the resource did not exist\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\PreconditionFailed\",\"Code\":0,\"Trace\":\"#0 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(474): Sabre\\\\DAV\\\\Server->checkPreconditions(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#1 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Server.php(229): Sabre\\\\DAV\\\\Server->exec()\\n#3 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#4 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/remote.php(165): require_once('\\\/srv\\\/www\\\/htdocs...')\\n#5 {main}\",\"File\":\"\\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1309,\"User\":\"admin\"}"} {"reqId":"8zYlEnfzBMb1ChuIrY9M","level":0,"time":"2017-06-23T13:28:48+00:00","remoteAddr":"127.0.0.1","user":"admin","app":"webdav","method":"PUT","url":"\/owncloud\/remote.php\/dav\/files\/admin\/data1.dat-chunking-3886638851-13-0","message":"Exception: {\"Message\":\"HTTP\\\/1.1 412 An If-Match header was specified and the resource did not exist\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\PreconditionFailed\",\"Code\":0,\"Trace\":\"#0 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(474): Sabre\\\\DAV\\\\Server->checkPreconditions(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#1 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Server.php(229): Sabre\\\\DAV\\\\Server->exec()\\n#3 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#4 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/remote.php(165): require_once('\\\/srv\\\/www\\\/htdocs...')\\n#5 {main}\",\"File\":\"\\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1309,\"User\":\"admin\"}"} {"reqId":"MKPYz2yrKVCVcwd7rkzS","level":0,"time":"2017-06-23T13:28:51+00:00","remoteAddr":"127.0.0.1","user":"admin","app":"webdav","method":"PUT","url":"\/owncloud\/remote.php\/dav\/files\/admin\/data1.dat-chunking-3246638472-13-2","message":"Exception: {\"Message\":\"HTTP\\\/1.1 412 An If-Match header was specified and the resource did not exist\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\PreconditionFailed\",\"Code\":0,\"Trace\":\"#0 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(474): Sabre\\\\DAV\\\\Server->checkPreconditions(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#1 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Server.php(229): Sabre\\\\DAV\\\\Server->exec()\\n#3 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#4 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/remote.php(165): require_once('\\\/srv\\\/www\\\/htdocs...')\\n#5 {main}\",\"File\":\"\\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1309,\"User\":\"admin\"}"} {"reqId":"ETCSfrMC8JaUaMztJM7w","level":0,"time":"2017-06-23T13:28:51+00:00","remoteAddr":"127.0.0.1","user":"admin","app":"webdav","method":"PUT","url":"\/owncloud\/remote.php\/dav\/files\/admin\/data1.dat-chunking-3246638472-13-1","message":"Exception: {\"Message\":\"HTTP\\\/1.1 412 An If-Match header was specified and the resource did not exist\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\PreconditionFailed\",\"Code\":0,\"Trace\":\"#0 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(474): Sabre\\\\DAV\\\\Server->checkPreconditions(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#1 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(254): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/Server.php(229): Sabre\\\\DAV\\\\Server->exec()\\n#3 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v2\\\/remote.php(31): OCA\\\\DAV\\\\Server->exec()\\n#4 \\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/remote.php(165): require_once('\\\/srv\\\/www\\\/htdocs...')\\n#5 {main}\",\"File\":\"\\\/srv\\\/www\\\/htdocs\\\/owncloud\\\/lib\\\/composer\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1309,\"User\":\"admin\"}"} ``` If you do the same test with a regular file that you overwrite, it will use the new chunking approach with the "uploads" folder: ``` 127.0.0.1 - admin [23/Jun/2017:15:53:36 +0200] "MKCOL /owncloud/remote.php/dav/uploads/admin/1226433652 HTTP/1.1" 201 - "-" "Mozilla/5.0 (Linux) mirall/2.3.2" 127.0.0.1 - admin [23/Jun/2017:15:53:36 +0200] "PUT /owncloud/remote.php/dav/uploads/admin/1226433652/00000000 HTTP/1.1" 201 - "-" "Mozilla/5.0 (Linux) mirall/2.3.2" 127.0.0.1 - admin [23/Jun/2017:15:53:37 +0200] "PUT /owncloud/remote.php/dav/uploads/admin/1226433652/00000001 HTTP/1.1" 201 - "-" "Mozilla/5.0 (Linux) mirall/2.3.2" ``` Is there a special logic in place that makes it fall back to old chunking and keeps the new dav endpoint ? I'd expect it to always use the "uploads" folder for any uploads when using the new dav endpoint. The error that happens on the server is not related, to be investigated in https://github.com/owncloud/core/issues/28197. In general I except all three approaches to be valid: 1. old chunking on old endpoint 2. old chunking on new endpoint 3. new chunking on new endpoint ("uploads") @guruz

similar report from NC user: https://github.com/nextcloud/server/issues/5238

The error will be fixed in the next version. There is a release candidate out there for testing, the final version will be released soon (next week perhaps??):

JasonBayton · August 29, 2017, 7:23pm

@tflidd has showed you the issues logged against it and provided a link to a working release candidate, a release won’t be far off but since you can jump from RC to final there’s no reason not to give it a go.

lex · September 4, 2017, 8:52am

Just a quick follow up here:

since using the owncloud client 2.3.3 rc2, this error did not reappear on my mac, so it appears to be solved.

However, before I alert my fellow users to update to the rc2, i tried to find out if the official release 2.3.3 for owncloud desktop client or even better nextcloud branded desktop client is imminent to be released, but i couldnt find any information on that. Anybody knows where to find a timetable or knows tentative release date? thanks!