When trying to copy an empty file using xrootd-http the operation fails.

On the client side:

[root@143e9b594cb7 tpc_transfers]# gfal-copy -v zero_bytes  https://gftp-2.t2.ucsd.edu:1094/store/user/ddavila/newdir/zero-bytes
Copying 0 bytes file:///tpc_transfers/zero_bytes => https://gftp-2.t2.ucsd.edu:1094/store/user/ddavila/newdir/zero-bytes
event: [1608242437461] BOTH   GFAL2:CORE:COPY	LIST:ENTER	
event: [1608242437462] BOTH   GFAL2:CORE:COPY	LIST:ITEM	file:///tpc_transfers/zero_bytes => https://gftp-2.t2.ucsd.edu:1094/store/user/ddavila/newdir/zero-bytes
event: [1608242437462] BOTH   GFAL2:CORE:COPY	LIST:EXIT	
event: [1608242437463] BOTH   http_plugin	PREPARE:ENTER	file:///tpc_transfers/zero_bytes => https://gftp-2.t2.ucsd.edu:1094/store/user/ddavila/newdir/zero-bytes
event: [1608242437725] BOTH   http_plugin	PREPARE:EXIT	file:///tpc_transfers/zero_bytes => https://gftp-2.t2.ucsd.edu:1094/store/user/ddavila/newdir/zero-bytes
event: [1608242437725] BOTH   http_plugin	TRANSFER:ENTER	file:///tpc_transfers/zero_bytes => https://gftp-2.t2.ucsd.edu:1094/store/user/ddavila/newdir/zero-bytes
event: [1608242437726] BOTH   http_plugin	TRANSFER:TYPE	streamed

On the server side (after the usual many HEAD requests from gfal) :

INFO in AuthzFun: Using cached entity with username ddavila
201217 14:00:37 2483 sysXrdHttp: getDataOneShot BuffAvailable: 1048576 maxread: 1048576
201217 14:00:37 2483 sysXrdHttp: getDataOneShot sslavail: 1048576
201217 14:00:37 2483 sysXrdHttp: read 173 of 1048576 bytes
201217 14:00:37 2483 sysXrdHttp:  rc:52 got hdr line: PUT /store/user/ddavila/newdir/zero-bytes HTTP/1.1

201217 14:00:37 2483 sysXrdHttp:  Parsing first line: PUT /store/user/ddavila/newdir/zero-bytes HTTP/1.1

201217 14:00:37 2483 sysXrdHttp:  rc:55 got hdr line: User-Agent: gfal2-util/1.5.3 gfal2/2.18.1 neon/0.0.29

201217 14:00:37 2483 sysXrdHttp:  rc:14 got hdr line: TE: trailers

201217 14:00:37 2483 sysXrdHttp:  rc:31 got hdr line: Host: gftp-2.t2.ucsd.edu:1094

201217 14:00:37 2483 sysXrdHttp:  rc:19 got hdr line: Content-Length: 0

201217 14:00:37 2483 sysXrdHttp:  rc:2 got hdr line: 

201217 14:00:37 2483 sysXrdHttp:  rc:2 detected header end.
201217 14:00:37 2483 XrootdBridge: ddavila.8:[log in to unmask] login as ddavila
201217 14:00:37 2483 ddavila.8:[log in to unmask] sysXrdHttp:  Process. lp:0x7fcb30003828 reqstate: 0
201217 14:00:37 2483 ddavila.8:[log in to unmask] sysXrdHttp: Process is exiting rc:1
File we will access: /cms/store/user/ddavila/newdir/zero-bytes
201217 14:00:38 2483 sysXrdHttp:  XrdHttpReq::Data! final=0
201217 14:00:38 2483 ddavila.8:[log in to unmask] sysXrdHttp: PostProcessHTTPReq req: 4 reqstate: 0
201217 14:00:38 2483 ddavila.8:[log in to unmask] sysXrdHttp: fhandle:0:0:0:0

The gfal2 versions used are:

gfal2-util-1.5.3-1.el7.noarch
gfal2-2.18.1-1.1.osg35.el7.x86_64
gfal2-plugin-http-2.18.1-1.1.osg35.el7.x86_64

The XRootD server version is 4.12.6-0.rc1

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