An attempt was made in the original code, but the whole thing was designed in the hope of actually switching to turbo, so it was super janky without it.
Anyway, we now actually have a sane way to set socket timeouts, so, use that, and set them very tight for now.
This is fairly critical right now, because the server is down, and the default timeouts are ~30s. That happens to be *above* the debounce threshold, so you can't even hope for that to help you. Meaning, right now, you get a 2 * 30s block on resume with auto sync. That's... Very Not Good(TM).
That becomes a single 2s one after this.
Currently the progress sent to the server can be either a string or an int (depending on whetther the document has pages).
The following are both payload sent from koreader to the server.
```
{"percentage":0.005,"device":"device_name","device_id":"B78EA04ACC3A453DBA220D720C0BE102","document":"348e34463a44ba68659fc6fe814a6778","progress":3}
```
where document `348e34463a44ba68659fc6fe814a6778` is a pdf file.
```
{"percentage":1,"device":"device_name","device_id":"B78EA04ACC3A453DBA220D720C0BE102","document":"4eb484b229696cb39cd8fe5495aa1bbe","progress":"\/body\/DocFragment[30]\/body\/p\/img.0"}
```
where document `4eb484b229696cb39cd8fe5495aa1bbe` is an epub file.
This may add extra work to the backend server. A few commits were added to my personal fork of [kosyncsrv](https://github.com/yeeac/kosyncsrv) (a kosync backend server). kosyncsrv initially tries to decode progress as a string. It then failed on document with pages (in which, progress is just integer page number). I then change the field's type, only to [revert it later](8a642e31a0).
I believe it is more appropriate for us to fix the progress type to string.
This reverts commit d90e221a17. Reverts #6489 since it introduced problems for people having [*]Auto sync now and in the furture & Action when wifi off: prompt.
The 'KOSync' plugin will synchronize furthest reading progress
across different koreader devices after users registering their
devices.
The synchronizing service is open-sourced as the project
[koreader/koreader-sync-server](https://github.com/koreader/koreader-sync-server).
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