Fenix doesn't Sync with the syncstorage: Missing server timestamp header in request

[jewelooper]

I successfully managed to sync my bookmarks with Firefox for Desktop and my self-hosted syncstorage (with build in tokenserver).
But syncing with Fenix does not work.
The sync stops with error sync failed: Missing server timestamp header in request
Issue mozilla/application-services#3379 describes similar symptoms.
This comment seems to be interesting:

So this sync failed: Missing server timestamp header in request is very strange, and seems to indicate that you're getting a 200 OK from tokenserver that somehow doesn't include the X-Timestamp header. This should in theory be impossible (which is one of the reasons we error on it) because there's a "tween" in the tokenserver server code that sets this header on every response. So, I'm not entirely sure what's happening here.
Originally posted by @rfk in mozilla/application-services#3379 (comment)

Maybe new tokenserver also doesn't include the X-Timestamp header?

Fenix settings:
custom account-server: empty/default
custom sync-server: https://mydomain.com/1.0/sync/1.5

ADB logcat:

03-06 08:27:23.250  5519  5561 I FirefoxAccount: Executing: get access token
03-06 08:27:23.280  5519  5561 I FirefoxAccount: Successfully executed: get access token
03-06 08:27:23.280  5519  5561 I FirefoxAccount: Executing: getTokenServerEndpointURL
03-06 08:27:23.281  5519  5561 I FirefoxAccount: Successfully executed: getTokenServerEndpointURL
03-06 08:27:23.286  5519  5561 I FxaDeviceConstellation: Refreshing device list...
03-06 08:27:23.286  5519  5561 I FxaDeviceConstellation: Executing: fetching all devices
03-06 08:27:23.374  5519  5560 I sync_manager::manager: No backoff in effect (or we decided to ignore it), starting sync
03-06 08:27:23.374  5519  5560 I sync15::sync_multiple: Syncing 6 engines
03-06 08:27:23.374  5519  5560 I sync15::sync_multiple: Loading/initializing persisted state
03-06 08:27:23.374  5519  5560 I sync15::sync_multiple: Preparing client info
03-06 08:27:23.374  5519  5560 I sync15::sync_multiple: Entering sync state machine
03-06 08:27:23.374  5519  5560 I sync15::sync_multiple: Advancing state machine to ready (full)
03-06 08:27:23.409  5519  5560 W sync15::sync_multiple: sync failed: Missing server timestamp header in request, final status=OtherError
03-06 08:27:23.409  5519  5560 W sync15::sync_multiple: Backtrace: None
03-06 08:27:23.409  5519  5560 I sync_manager::manager: Sync finished with status OtherError
03-06 08:27:23.411  5519  5560 E SyncWorker: 'Other' error :(
03-06 08:27:23.414  5519  5610 I WM-WorkerWrapper: Worker result FAILURE for Work [ id=6175d63b-5b6f-45d2-b55e-c18a77a3db25, tags={ Immediate, mozilla.components.service.fxa.sync.WorkManagerSyncWorker, Common } ]
03-06 08:27:24.505  5519  5561 I FxaDeviceConstellation: Successfully executed: fetching all devices
03-06 08:27:24.505  5519  5561 I FxaDeviceConstellation: Refreshed device list; saw 3 device(s).`

conf.toml

port=5000
database_url = "mysql://ffsync:passwd@localhost:3306/syncstorage_rs"
master_secret = "fd612d21680740d12bc4891994b55151662d204c"
human_logs = 1
disable_syncstorage = false
tokenserver.enabled = true
tokenserver.test_mode_enabled = false
tokenserver.node_type = "mysql"
tokenserver.database_url = "mysql://ffsync:passwd@localhost:3306/syncstorage_rs"
tokenserver.fxa_metrics_hash_secret = "fd612d21680740d12bc4891994b55151662d204c"
tokenserver.fxa_email_domain = "api.accounts.firefox.com"
tokenserver.fxa_oauth_server_url = "https://oauth.accounts.firefox.com"
cors_allowed_origin = "null"
cors_max_age = 86400

[ethowitz]

I believe you're right -- the new Tokenserver doesn't include the X-Timestamp header. Thank you for catching this!

[jewelooper]

As a workaround I'm setting X-Timestamp by apache proxy server.
It seems to work with the following v-host setting.

Header set X-Timestamp %t
Header edit X-Timestamp t= ""