WOPI proof key fail to validate when get content file

Question

Hi,

I would like to ask what was the possible failure in proof key validation? We are using same code base for two scenarios below. Not sure why the proof key validation is successful on CheckFileInfo but failure at Get Content file. It's only happened in Excel Get Content file but it's working fine for powerpoint, word and other file types.

• I'm using this server link -https://excel.officeapps.live.com/x/_layouts/xlviewerinternal.aspx

I'm able to get validation work for this CheckFileInfo as following details

URi : https://xxxxx.example.com/officeOnline/wopi/files/109893557?access_token=b263c798-da01-4220-95ab-350ebfe2cb4e&access_token_ttl=1678455701613

X-WOPI-Proof: NKDDHc6H5oIufWw3VNdAefAvgPbYexRuamcUrwe1OINCVJ+q6WRXPJIomXwrR32DOrmrEZ7iQhbIk+QpluYBXs7/TyeOFAblDcrU77efK7lxjQKGJX+LZUhm5oFEzCu6m9rGc3sMvvhvi4IO3EIAGwcPCoK8yDyXVU89PC0aMXrOEvJMypBZCuTwx4j70/J9q49G5mPD0hUpB+z8jCDgeZCtTCzEEZgEgAN6kY8i0iCpYOBNvVE2EfqOMyexSvoSrUE3Tl8BhUTOoJGzYqjatbop7JGCLYvxkCsr71SMYZtg1lmxs6yhLKjTRztisNWp+ZHFhEiZQIFlRiX4XnV04Q==

X-WOPI-ProofOld:
ircoWWmZfEcQ8DoCFo2JbXYtYDzDycXsBEDqrCf1UbhYn4p1c0lo1ulsXSkfcGHyoPJCxjDc9vxtpi8chS9PD6dg100B4byheVQiehPnRd1aJAwGaVNzQAuur99q0KPZyhH6YZIJg1Jao7d84OXhz+SL3iKdSZyLC7HgpwqOfyRQbGMOfIUfKl0YxSP1WCkR9A5KO6vJiHKFIBQyHl9BnUAz2E41IgDNbWPaNBHlzgLRXOr2pzSTqCHVr9y0z7yxvroFmtuEnSeBs7OVIgBN0UB3wSHOK+4JotO9iPzjOj6V4UzsUMR6eN3jwFlrdKWm0Pm1gFBbSCHQJPUu7uaFzQ==

X-WOPI-TimeStamp: 638140093031902829

But same thread to get file content is not working and validation failed

URi : https://xxxxx.example.com/officeOnline/wopi/files/109893557/contents?access_token=b263c798%2Dda01%2D4220%2D95ab%2D350ebfe2cb4e&access_token_ttl=1678455701613

X-WOPI-Proof: dqtFtKeYm20QlSIV8ezlRDKQMh7RrxCwszN19YMC5NH6JVuHSDVzkQPB+xcjml6IknV7p+1/9T0+DLj1JUKOqDQ530YKE/BWV5vXZ2/TsjAqlGAAywphsrkbnZ461eLvDN1Scdk20Ll1OwHJAcTh/utuRweTtXs0hHce6gQ1jbxR+6G8trujSE7TsrbvwkPdQHtV25PJtib+92rxUAMkmuF/jPa8oHPMKSpRZ9vCfaTshROrSARQtYIQPj3aQbMuUBOHzoqj7ebs/b8Z+R+ItSx5xNJDjXOg0SuRLV/fiXMPP5NMt4x7Hicn/vb+s+5fyO+c0SzcE53m7J6wioHzKA==

X-WOPI-ProofOld:
iLsCAbOe8tUKgJ5rao7n681AbDsYdP3MKoXNfw86bml9Mrt1AXAy/J+FMgQTPRMlIPT+mok2plbUS7SgaPOIsevddyZ2uI/XJ3w3FbNcLf6yjTtfhvx0b6k02x4hRSaXo9ik7i5PhkN4f10W3+ceSNAGmHcfUcIGRBlFhMUsuIfS4gAwn78g00q5juKoNoKxAElnm4NNJmLFuFGvPWS28i6GQHnd0TDfxbvh2ZolBrGpHVXpdPGiLOdK0fviD+uXOLR380pBZXiaA46DxFND2W9wUxYYnFmufZGV94Puur2sWJjERCh4GxY3nD4HFfRGsDQhMRS2zYcyTHL0CIYd4g==

X-WOPI-TimeStamp: 638140093031902829