Hi, We have recently observed a few cases where large files ( O(50GB) ) - transferred via FTS (using davs) - have failed to checksum in time, after the transfer has completed. In FTS, there is apparently a 5 minute timeout that fires within the HTTP client library used by FTS. The FTS team tried sending "Expect: 100-continue" header in the request for the checksum, but did not receive the "100-continue status code” response. My questions are: 1) does XRootD (WebDav) support "Expect: 100-continue” headers ? And 2) If 1) is true, because we use an external script (via xrootd.chksum directive) would a 100-continue be ignored? I hope this provides enough info, but please let me know if more clarification is required. Thanks in advance, James ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-L list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-L&A=1