INFO:ankisyncd.http:xxx.xxx.xxx.xxx "POST /msync//begin HTTP/1.1" 404 52

[mail1995]

The OS was Debian 10 Buster
The python version was python3
The anki-sync-server server can be installed as the instruction as this git document description.

Android Phone: AnkiDroid version 2.9.2
Linux Laptop: Anki Version 2.1.15 (442df9d6) Qt 5.12.1 PyQt 5.11.3

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result:
The anki-sync-server running as normal. And the media attachment can not be used.
The AnkiDroid v2.92 can sync with anki-sync-server as normal. except that "Sync error: Syncing error, type: 404, message: Not Found"

The linux version Anki2.1.15 can sync with anki-sync-server as normal.

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anki-sync-server system log:
...
INFO:ankisyncd.http:xxx.xxx.xxx.xxx "POST /sync/finish HTTP/1.1" 200 13
...
INFO:ankisyncd.http:xxx.xxx.xxx.xxx "POST /msync//begin HTTP/1.1" 404 52

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What's your opinion on this topic?
Could you please give any idea?

Thanks!

[TooYoungTooSimp]

Change AnkiDroid's msync url from xxxx/msync/ to xxxx/msync (remove last /) may solve this problem.